Move messages out of dart2js.

pkg/compiler/lib/src/diagnostics/messages.dart

 // Copyright (c) 2011, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
-
-/**
- * The messages in this file should meet the following guide lines:
- *
- * 1. The message should be a complete sentence starting with an uppercase
- * letter, and ending with a period.
- *
- * 2. Reserved words and embedded identifiers should be in single quotes, so
- * prefer double quotes for the complete message. For example, "The
- * class '#{className}' can't use 'super'." Notice that the word 'class' in the
- * preceding message is not quoted as it refers to the concept 'class', not the
- * reserved word. On the other hand, 'super' refers to the reserved word. Do
- * not quote 'null' and numeric literals.
- *
- * 3. Do not try to compose messages, as it can make translating them hard.
- *
- * 4. Try to keep the error messages short, but informative.
- *
- * 5. Use simple words and terminology, assume the reader of the message
- * doesn't have an advanced degree in math, and that English is not the
- * reader's native language. Do not assume any formal computer science
- * training. For example, do not use Latin abbreviations (prefer "that is" over
- * "i.e.", and "for example" over "e.g."). Also avoid phrases such as "if and
- * only if" and "iff", that level of precision is unnecessary.
- *
- * 6. Prefer contractions when they are in common use, for example, prefer
- * "can't" over "cannot". Using "cannot", "must not", "shall not", etc. is
- * off-putting to people new to programming.
- *
- * 7. Use common terminology, preferably from the Dart Language
- * Specification. This increases the user's chance of finding a good
- * explanation on the web.
- *
- * 8. Do not try to be cute or funny. It is extremely frustrating to work on a
- * product that crashes with a "tongue-in-cheek" message, especially if you did
- * not want to use this product to begin with.
- *
- * 9. Do not lie, that is, do not write error messages containing phrases like
- * "can't happen".  If the user ever saw this message, it would be a
- * lie. Prefer messages like: "Internal error: This function should not be
- * called when 'x' is null.".
- *
- * 10. Prefer to not use imperative tone. That is, the message should not sound
- * accusing or like it is ordering the user around. The computer should
- * describe the problem, not criticize for violating the specification.
- *
- * Other things to keep in mind:
- *
- * An INFO message should always be preceded by a non-INFO message, and the
- * INFO messages are additional details about the preceding non-INFO
- * message. For example, consider duplicated elements. First report a WARNING
- * or ERROR about the duplicated element, and then report an INFO about the
- * location of the existing element.
- *
- * Generally, we want to provide messages that consists of three sentences:
- * 1. what is wrong, 2. why is it wrong, 3. how do I fix it. However, we
- * combine the first two in [template] and the last in [howToFix].
- */
-
 library dart2js.messages;
 
 import '../tokens/token.dart' show
     ErrorToken,
     Token;
 
 import 'invariant.dart' show
     invariant;
 import 'spannable.dart' show
     CURRENT_ELEMENT_SPANNABLE;
 
-const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
+import 'dart2js_messages.dart' as dart2js_messages;
+import 'shared_messages.dart' as shared_messages;
 
 /// Keys for the [MessageTemplate]s.
 enum MessageKind {
   ABSTRACT_CLASS_INSTANTIATION,
   ABSTRACT_GETTER,
   ABSTRACT_METHOD,
   ABSTRACT_SETTER,
   ACCESSED_IN_CLOSURE,
   ACCESSED_IN_CLOSURE_HERE,
   ADDITIONAL_ARGUMENT,
@@ skipping 366 matching lines @@
   UNUSED_TYPEDEF,
   VAR_FUNCTION_TYPE_PARAMETER,
   VOID_EXPRESSION,
   VOID_NOT_ALLOWED,
   VOID_VARIABLE,
   WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT,
   WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT,
   YIELDING_MODIFIER_ON_ARROW_BODY,
 }
 
+const _KIND_TO_STRING_MAP = const <MessageKind, String>{
+  MessageKind.ABSTRACT_CLASS_INSTANTIATION: "ABSTRACT_CLASS_INSTANTIATION",
+  MessageKind.ABSTRACT_GETTER: "ABSTRACT_GETTER",
+  MessageKind.ABSTRACT_METHOD: "ABSTRACT_METHOD",
+  MessageKind.ABSTRACT_SETTER: "ABSTRACT_SETTER",
+  MessageKind.ACCESSED_IN_CLOSURE: "ACCESSED_IN_CLOSURE",
+  MessageKind.ACCESSED_IN_CLOSURE_HERE: "ACCESSED_IN_CLOSURE_HERE",
+  MessageKind.ADDITIONAL_ARGUMENT: "ADDITIONAL_ARGUMENT",
+  MessageKind.ADDITIONAL_TYPE_ARGUMENT: "ADDITIONAL_TYPE_ARGUMENT",
+  MessageKind.ALREADY_INITIALIZED: "ALREADY_INITIALIZED",
+  MessageKind.AMBIGUOUS_LOCATION: "AMBIGUOUS_LOCATION",
+  MessageKind.AMBIGUOUS_REEXPORT: "AMBIGUOUS_REEXPORT",
+  MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS: "ASSERT_IS_GIVEN_NAMED_ARGUMENTS",

[Johnni Winther, 2015/12/08 09:18:27]

Long line. More below.

[floitsch, 2015/12/09 08:42:40]

I used dartfmt to format the file.
There are a few other changes now, but they don't look too bad, so I kept them.
done.

+  MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER: "ASSIGNING_FINAL_FIELD_IN_SUPER",
+  MessageKind.ASSIGNING_METHOD: "ASSIGNING_METHOD",
+  MessageKind.ASSIGNING_METHOD_IN_SUPER: "ASSIGNING_METHOD_IN_SUPER",
+  MessageKind.ASSIGNING_TYPE: "ASSIGNING_TYPE",
+  MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER: "ASYNC_KEYWORD_AS_IDENTIFIER",
+  MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD: "ASYNC_MODIFIER_ON_ABSTRACT_METHOD",
+  MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR: "ASYNC_MODIFIER_ON_CONSTRUCTOR",
+  MessageKind.ASYNC_MODIFIER_ON_SETTER: "ASYNC_MODIFIER_ON_SETTER",
+  MessageKind.AWAIT_MEMBER_NOT_FOUND: "AWAIT_MEMBER_NOT_FOUND",
+  MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE: "AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE",
+  MessageKind.BAD_INPUT_CHARACTER: "BAD_INPUT_CHARACTER",
+  MessageKind.BEFORE_TOP_LEVEL: "BEFORE_TOP_LEVEL",
+  MessageKind.BINARY_OPERATOR_BAD_ARITY: "BINARY_OPERATOR_BAD_ARITY",
+  MessageKind.BODY_EXPECTED: "BODY_EXPECTED",
+  MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS: "CALL_NOT_SUPPORTED_ON_NATIVE_CLASS",
+  MessageKind.CANNOT_EXTEND: "CANNOT_EXTEND",
+  MessageKind.CANNOT_EXTEND_ENUM: "CANNOT_EXTEND_ENUM",
+  MessageKind.CANNOT_EXTEND_MALFORMED: "CANNOT_EXTEND_MALFORMED",
+  MessageKind.CANNOT_FIND_CONSTRUCTOR: "CANNOT_FIND_CONSTRUCTOR",
+  MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR: "CANNOT_FIND_UNNAMED_CONSTRUCTOR",
+  MessageKind.CANNOT_IMPLEMENT: "CANNOT_IMPLEMENT",
+  MessageKind.CANNOT_IMPLEMENT_ENUM: "CANNOT_IMPLEMENT_ENUM",
+  MessageKind.CANNOT_IMPLEMENT_MALFORMED: "CANNOT_IMPLEMENT_MALFORMED",
+  MessageKind.CANNOT_INSTANTIATE_ENUM: "CANNOT_INSTANTIATE_ENUM",
+  MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE: "CANNOT_INSTANTIATE_TYPE_VARIABLE",
+  MessageKind.CANNOT_INSTANTIATE_TYPEDEF: "CANNOT_INSTANTIATE_TYPEDEF",
+  MessageKind.CANNOT_MIXIN: "CANNOT_MIXIN",
+  MessageKind.CANNOT_MIXIN_ENUM: "CANNOT_MIXIN_ENUM",
+  MessageKind.CANNOT_MIXIN_MALFORMED: "CANNOT_MIXIN_MALFORMED",
+  MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD: "CANNOT_OVERRIDE_FIELD_WITH_METHOD",
+  MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT: "CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT",
+  MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD: "CANNOT_OVERRIDE_GETTER_WITH_METHOD",
+  MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT: "CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT",
+  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD: "CANNOT_OVERRIDE_METHOD_WITH_FIELD",
+  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT: "CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT",
+  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER: "CANNOT_OVERRIDE_METHOD_WITH_GETTER",
+  MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT: "CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT",
+  MessageKind.CANNOT_RESOLVE: "CANNOT_RESOLVE",
+  MessageKind.CANNOT_RESOLVE_AWAIT: "CANNOT_RESOLVE_AWAIT",
+  MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE: "CANNOT_RESOLVE_AWAIT_IN_CLOSURE",
+  MessageKind.CANNOT_RESOLVE_CONSTRUCTOR: "CANNOT_RESOLVE_CONSTRUCTOR",
+  MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT: "CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT",
+  MessageKind.CANNOT_RESOLVE_GETTER: "CANNOT_RESOLVE_GETTER",
+  MessageKind.CANNOT_RESOLVE_IN_INITIALIZER: "CANNOT_RESOLVE_IN_INITIALIZER",
+  MessageKind.CANNOT_RESOLVE_SETTER: "CANNOT_RESOLVE_SETTER",
+  MessageKind.CANNOT_RESOLVE_TYPE: "CANNOT_RESOLVE_TYPE",
+  MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR: "CANNOT_RETURN_FROM_CONSTRUCTOR",
+  MessageKind.CLASS_NAME_EXPECTED: "CLASS_NAME_EXPECTED",
+  MessageKind.COMPILER_CRASHED: "COMPILER_CRASHED",
+  MessageKind.COMPLEX_RETURNING_NSM: "COMPLEX_RETURNING_NSM",
+  MessageKind.COMPLEX_THROWING_NSM: "COMPLEX_THROWING_NSM",
+  MessageKind.CONSIDER_ANALYZE_ALL: "CONSIDER_ANALYZE_ALL",
+  MessageKind.CONST_CALLS_NON_CONST: "CONST_CALLS_NON_CONST",
+  MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT: "CONST_CALLS_NON_CONST_FOR_IMPLICIT",
+  MessageKind.CONST_CONSTRUCTOR_HAS_BODY: "CONST_CONSTRUCTOR_HAS_BODY",
+  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS: "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS",
+  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR: "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR",
+  MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD: "CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD",
+  MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS: "CONST_MAP_KEY_OVERRIDES_EQUALS",
+  MessageKind.CONST_WITHOUT_INITIALIZER: "CONST_WITHOUT_INITIALIZER",
+  MessageKind.CONSTRUCTOR_CALL_EXPECTED: "CONSTRUCTOR_CALL_EXPECTED",
+  MessageKind.CONSTRUCTOR_IS_NOT_CONST: "CONSTRUCTOR_IS_NOT_CONST",
+  MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE: "CONSTRUCTOR_WITH_RETURN_TYPE",
+  MessageKind.CYCLIC_CLASS_HIERARCHY: "CYCLIC_CLASS_HIERARCHY",
+  MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS: "CYCLIC_COMPILE_TIME_CONSTANTS",
+  MessageKind.CYCLIC_REDIRECTING_FACTORY: "CYCLIC_REDIRECTING_FACTORY",
+  MessageKind.CYCLIC_TYPE_VARIABLE: "CYCLIC_TYPE_VARIABLE",
+  MessageKind.CYCLIC_TYPEDEF: "CYCLIC_TYPEDEF",
+  MessageKind.CYCLIC_TYPEDEF_ONE: "CYCLIC_TYPEDEF_ONE",
+  MessageKind.DART_EXT_NOT_SUPPORTED: "DART_EXT_NOT_SUPPORTED",
+  MessageKind.DEFERRED_COMPILE_TIME_CONSTANT: "DEFERRED_COMPILE_TIME_CONSTANT",
+  MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION: "DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION",
+  MessageKind.DEFERRED_LIBRARY_DART_2_DART: "DEFERRED_LIBRARY_DART_2_DART",
+  MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX: "DEFERRED_LIBRARY_DUPLICATE_PREFIX",
+  MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX: "DEFERRED_LIBRARY_WITHOUT_PREFIX",
+  MessageKind.DEFERRED_OLD_SYNTAX: "DEFERRED_OLD_SYNTAX",
+  MessageKind.DEFERRED_TYPE_ANNOTATION: "DEFERRED_TYPE_ANNOTATION",
+  MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX: "DEPRECATED_TYPEDEF_MIXIN_SYNTAX",
+  MessageKind.DIRECTLY_THROWING_NSM: "DIRECTLY_THROWING_NSM",
+  MessageKind.DISALLOWED_LIBRARY_IMPORT: "DISALLOWED_LIBRARY_IMPORT",
+  MessageKind.DUPLICATE_DEFINITION: "DUPLICATE_DEFINITION",
+  MessageKind.DUPLICATE_EXPORT: "DUPLICATE_EXPORT",
+  MessageKind.DUPLICATE_EXPORT_CONT: "DUPLICATE_EXPORT_CONT",
+  MessageKind.DUPLICATE_EXPORT_DECL: "DUPLICATE_EXPORT_DECL",
+  MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS: "DUPLICATE_EXTENDS_IMPLEMENTS",
+  MessageKind.DUPLICATE_IMPLEMENTS: "DUPLICATE_IMPLEMENTS",
+  MessageKind.DUPLICATE_IMPORT: "DUPLICATE_IMPORT",
+  MessageKind.DUPLICATE_INITIALIZER: "DUPLICATE_INITIALIZER",
+  MessageKind.DUPLICATE_LABEL: "DUPLICATE_LABEL",
+  MessageKind.DUPLICATE_SUPER_INITIALIZER: "DUPLICATE_SUPER_INITIALIZER",
+  MessageKind.DUPLICATE_TYPE_VARIABLE_NAME: "DUPLICATE_TYPE_VARIABLE_NAME",
+  MessageKind.DUPLICATED_LIBRARY_NAME: "DUPLICATED_LIBRARY_NAME",
+  MessageKind.DUPLICATED_LIBRARY_RESOURCE: "DUPLICATED_LIBRARY_RESOURCE",
+  MessageKind.DUPLICATED_PART_OF: "DUPLICATED_PART_OF",
+  MessageKind.DUPLICATED_RESOURCE: "DUPLICATED_RESOURCE",
+  MessageKind.EMPTY_CATCH_DECLARATION: "EMPTY_CATCH_DECLARATION",
+  MessageKind.EMPTY_ENUM_DECLARATION: "EMPTY_ENUM_DECLARATION",
+  MessageKind.EMPTY_HIDE: "EMPTY_HIDE",
+  MessageKind.EQUAL_MAP_ENTRY_KEY: "EQUAL_MAP_ENTRY_KEY",
+  MessageKind.EMPTY_SHOW: "EMPTY_SHOW",
+  MessageKind.EXISTING_DEFINITION: "EXISTING_DEFINITION",
+  MessageKind.EXISTING_LABEL: "EXISTING_LABEL",
+  MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD: "EXPECTED_IDENTIFIER_NOT_RESERVED_WORD",
+  MessageKind.EXPERIMENTAL_ASSERT_MESSAGE: "EXPERIMENTAL_ASSERT_MESSAGE",
+  MessageKind.EXPONENT_MISSING: "EXPONENT_MISSING",
+  MessageKind.EXPORT_BEFORE_PARTS: "EXPORT_BEFORE_PARTS",
+  MessageKind.EXTERNAL_WITH_BODY: "EXTERNAL_WITH_BODY",
+  MessageKind.EXTRA_CATCH_DECLARATION: "EXTRA_CATCH_DECLARATION",
+  MessageKind.EXTRA_FORMALS: "EXTRA_FORMALS",
+  MessageKind.EXTRANEOUS_MODIFIER: "EXTRANEOUS_MODIFIER",
+  MessageKind.EXTRANEOUS_MODIFIER_REPLACE: "EXTRANEOUS_MODIFIER_REPLACE",
+  MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY: "FACTORY_REDIRECTION_IN_NON_FACTORY",
+  MessageKind.FINAL_FUNCTION_TYPE_PARAMETER: "FINAL_FUNCTION_TYPE_PARAMETER",
+  MessageKind.FINAL_WITHOUT_INITIALIZER: "FINAL_WITHOUT_INITIALIZER",
+  MessageKind.FORIN_NOT_ASSIGNABLE: "FORIN_NOT_ASSIGNABLE",
+  MessageKind.FORMAL_DECLARED_CONST: "FORMAL_DECLARED_CONST",
+  MessageKind.FORMAL_DECLARED_STATIC: "FORMAL_DECLARED_STATIC",
+  MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT: "FUNCTION_TYPE_FORMAL_WITH_DEFAULT",
+  MessageKind.FUNCTION_WITH_INITIALIZER: "FUNCTION_WITH_INITIALIZER",
+  MessageKind.GENERIC: "GENERIC",
+  MessageKind.GETTER_MISMATCH: "GETTER_MISMATCH",
+  MessageKind.GETTER_NOT_FOUND: "GETTER_NOT_FOUND",
+  MessageKind.HEX_DIGIT_EXPECTED: "HEX_DIGIT_EXPECTED",
+  MessageKind.HIDDEN_HINTS: "HIDDEN_HINTS",
+  MessageKind.HIDDEN_IMPLICIT_IMPORT: "HIDDEN_IMPLICIT_IMPORT",
+  MessageKind.HIDDEN_IMPORT: "HIDDEN_IMPORT",
+  MessageKind.HIDDEN_WARNINGS: "HIDDEN_WARNINGS",
+  MessageKind.HIDDEN_WARNINGS_HINTS: "HIDDEN_WARNINGS_HINTS",
+  MessageKind.IF_NULL_ASSIGNING_TYPE: "IF_NULL_ASSIGNING_TYPE",
+  MessageKind.ILLEGAL_CONST_FIELD_MODIFIER: "ILLEGAL_CONST_FIELD_MODIFIER",
+  MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS: "ILLEGAL_CONSTRUCTOR_MODIFIERS",
+  MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER: "ILLEGAL_FINAL_METHOD_MODIFIER",
+  MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS: "ILLEGAL_MIXIN_APPLICATION_MODIFIERS",
+  MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR: "ILLEGAL_MIXIN_CONSTRUCTOR",
+  MessageKind.ILLEGAL_MIXIN_CYCLE: "ILLEGAL_MIXIN_CYCLE",
+  MessageKind.ILLEGAL_MIXIN_OBJECT: "ILLEGAL_MIXIN_OBJECT",
+  MessageKind.ILLEGAL_MIXIN_SUPER_USE: "ILLEGAL_MIXIN_SUPER_USE",
+  MessageKind.ILLEGAL_MIXIN_SUPERCLASS: "ILLEGAL_MIXIN_SUPERCLASS",
+  MessageKind.ILLEGAL_MIXIN_WITH_SUPER: "ILLEGAL_MIXIN_WITH_SUPER",
+  MessageKind.ILLEGAL_SETTER_FORMALS: "ILLEGAL_SETTER_FORMALS",
+  MessageKind.ILLEGAL_STATIC: "ILLEGAL_STATIC",
+  MessageKind.ILLEGAL_SUPER_SEND: "ILLEGAL_SUPER_SEND",
+  MessageKind.IMPORT_BEFORE_PARTS: "IMPORT_BEFORE_PARTS",
+  MessageKind.IMPORT_EXPERIMENTAL_MIRRORS: "IMPORT_EXPERIMENTAL_MIRRORS",
+  MessageKind.IMPORT_PART_OF: "IMPORT_PART_OF",
+  MessageKind.IMPORTED_HERE: "IMPORTED_HERE",
+  MessageKind.INHERIT_GETTER_AND_METHOD: "INHERIT_GETTER_AND_METHOD",
+  MessageKind.INHERITED_EXPLICIT_GETTER: "INHERITED_EXPLICIT_GETTER",
+  MessageKind.INHERITED_IMPLICIT_GETTER: "INHERITED_IMPLICIT_GETTER",
+  MessageKind.INHERITED_METHOD: "INHERITED_METHOD",
+  MessageKind.INJECTED_PUBLIC_MEMBER: "INJECTED_PUBLIC_MEMBER",
+  MessageKind.INIT_STATIC_FIELD: "INIT_STATIC_FIELD",
+  MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED: "INITIALIZING_FORMAL_NOT_ALLOWED",
+  MessageKind.INSTANCE_STATIC_SAME_NAME: "INSTANCE_STATIC_SAME_NAME",
+  MessageKind.INSTANCE_STATIC_SAME_NAME_CONT: "INSTANCE_STATIC_SAME_NAME_CONT",
+  MessageKind.INTERNAL_LIBRARY: "INTERNAL_LIBRARY",
+  MessageKind.INTERNAL_LIBRARY_FROM: "INTERNAL_LIBRARY_FROM",
+  MessageKind.INVALID_ARGUMENT_AFTER_NAMED: "INVALID_ARGUMENT_AFTER_NAMED",
+  MessageKind.INVALID_AWAIT_FOR: "INVALID_AWAIT_FOR",
+  MessageKind.INVALID_BREAK: "INVALID_BREAK",
+  MessageKind.INVALID_CASE_DEFAULT: "INVALID_CASE_DEFAULT",
+  MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS: "INVALID_CONSTRUCTOR_ARGUMENTS",
+  MessageKind.INVALID_CONSTRUCTOR_NAME: "INVALID_CONSTRUCTOR_NAME",
+  MessageKind.INVALID_CONTINUE: "INVALID_CONTINUE",
+  MessageKind.INVALID_FOR_IN: "INVALID_FOR_IN",
+  MessageKind.INVALID_INITIALIZER: "INVALID_INITIALIZER",
+  MessageKind.INVALID_OVERRIDDEN_FIELD: "INVALID_OVERRIDDEN_FIELD",
+  MessageKind.INVALID_OVERRIDDEN_GETTER: "INVALID_OVERRIDDEN_GETTER",
+  MessageKind.INVALID_OVERRIDDEN_METHOD: "INVALID_OVERRIDDEN_METHOD",
+  MessageKind.INVALID_OVERRIDDEN_SETTER: "INVALID_OVERRIDDEN_SETTER",
+  MessageKind.INVALID_OVERRIDE_FIELD: "INVALID_OVERRIDE_FIELD",
+  MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER: "INVALID_OVERRIDE_FIELD_WITH_GETTER",
+  MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER: "INVALID_OVERRIDE_FIELD_WITH_SETTER",
+  MessageKind.INVALID_OVERRIDE_GETTER: "INVALID_OVERRIDE_GETTER",
+  MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD: "INVALID_OVERRIDE_GETTER_WITH_FIELD",
+  MessageKind.INVALID_OVERRIDE_METHOD: "INVALID_OVERRIDE_METHOD",
+  MessageKind.INVALID_OVERRIDE_SETTER: "INVALID_OVERRIDE_SETTER",
+  MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD: "INVALID_OVERRIDE_SETTER_WITH_FIELD",
+  MessageKind.INVALID_PACKAGE_CONFIG: "INVALID_PACKAGE_CONFIG",
+  MessageKind.INVALID_PACKAGE_URI: "INVALID_PACKAGE_URI",
+  MessageKind.INVALID_PARAMETER: "INVALID_PARAMETER",
+  MessageKind.INVALID_RECEIVER_IN_INITIALIZER: "INVALID_RECEIVER_IN_INITIALIZER",
+  MessageKind.INVALID_SOURCE_FILE_LOCATION: "INVALID_SOURCE_FILE_LOCATION",
+  MessageKind.INVALID_SYMBOL: "INVALID_SYMBOL",
+  MessageKind.INVALID_SYNC_MODIFIER: "INVALID_SYNC_MODIFIER",
+  MessageKind.INVALID_TYPE_VARIABLE_BOUND: "INVALID_TYPE_VARIABLE_BOUND",
+  MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME: "INVALID_UNNAMED_CONSTRUCTOR_NAME",
+  MessageKind.INVALID_URI: "INVALID_URI",
+  MessageKind.INVALID_USE_OF_SUPER: "INVALID_USE_OF_SUPER",
+  MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS: "JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS",
+  MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER: "JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER",
+  MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS: "JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS",
+  MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS: "JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS",
+  MessageKind.JS_PLACEHOLDER_CAPTURE: "JS_PLACEHOLDER_CAPTURE",
+  MessageKind.LIBRARY_NAME_MISMATCH: "LIBRARY_NAME_MISMATCH",
+  MessageKind.LIBRARY_NOT_FOUND: "LIBRARY_NOT_FOUND",
+  MessageKind.LIBRARY_NOT_SUPPORTED: "LIBRARY_NOT_SUPPORTED",
+  MessageKind.LIBRARY_TAG_MUST_BE_FIRST: "LIBRARY_TAG_MUST_BE_FIRST",
+  MessageKind.MAIN_NOT_A_FUNCTION: "MAIN_NOT_A_FUNCTION",
+  MessageKind.MAIN_WITH_EXTRA_PARAMETER: "MAIN_WITH_EXTRA_PARAMETER",
+  MessageKind.MALFORMED_STRING_LITERAL: "MALFORMED_STRING_LITERAL",
+  MessageKind.MEMBER_NOT_FOUND: "MEMBER_NOT_FOUND",
+  MessageKind.MEMBER_NOT_STATIC: "MEMBER_NOT_STATIC",
+  MessageKind.MEMBER_USES_CLASS_NAME: "MEMBER_USES_CLASS_NAME",
+  MessageKind.METHOD_NOT_FOUND: "METHOD_NOT_FOUND",
+  MessageKind.MINUS_OPERATOR_BAD_ARITY: "MINUS_OPERATOR_BAD_ARITY",
+  MessageKind.MIRROR_BLOAT: "MIRROR_BLOAT",
+  MessageKind.MIRROR_IMPORT: "MIRROR_IMPORT",
+  MessageKind.MIRROR_IMPORT_NO_USAGE: "MIRROR_IMPORT_NO_USAGE",
+  MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT: "MIRRORS_CANNOT_FIND_IN_ELEMENT",
+  MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY: "MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY",
+  MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY: "MIRRORS_CANNOT_RESOLVE_IN_LIBRARY",
+  MessageKind.MIRRORS_EXPECTED_STRING: "MIRRORS_EXPECTED_STRING",
+  MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST: "MIRRORS_EXPECTED_STRING_OR_LIST",
+  MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE: "MIRRORS_EXPECTED_STRING_OR_TYPE",
+  MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST: "MIRRORS_EXPECTED_STRING_TYPE_OR_LIST",
+  MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND: "MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND",
+  MessageKind.MISSING_ARGUMENT: "MISSING_ARGUMENT",
+  MessageKind.MISSING_ENUM_CASES: "MISSING_ENUM_CASES",
+  MessageKind.MISSING_FACTORY_KEYWORD: "MISSING_FACTORY_KEYWORD",
+  MessageKind.MISSING_FORMALS: "MISSING_FORMALS",
+  MessageKind.MISSING_LIBRARY_NAME: "MISSING_LIBRARY_NAME",
+  MessageKind.MISSING_MAIN: "MISSING_MAIN",
+  MessageKind.MISSING_PART_OF_TAG: "MISSING_PART_OF_TAG",
+  MessageKind.MISSING_TOKEN_AFTER_THIS: "MISSING_TOKEN_AFTER_THIS",
+  MessageKind.MISSING_TOKEN_BEFORE_THIS: "MISSING_TOKEN_BEFORE_THIS",
+  MessageKind.MISSING_TYPE_ARGUMENT: "MISSING_TYPE_ARGUMENT",
+  MessageKind.MULTI_INHERITANCE: "MULTI_INHERITANCE",
+  MessageKind.NAMED_ARGUMENT_NOT_FOUND: "NAMED_ARGUMENT_NOT_FOUND",
+  MessageKind.NAMED_FUNCTION_EXPRESSION: "NAMED_FUNCTION_EXPRESSION",
+  MessageKind.NAMED_PARAMETER_WITH_EQUALS: "NAMED_PARAMETER_WITH_EQUALS",
+  MessageKind.NATIVE_NOT_SUPPORTED: "NATIVE_NOT_SUPPORTED",
+  MessageKind.NO_BREAK_TARGET: "NO_BREAK_TARGET",
+  MessageKind.NO_CATCH_NOR_FINALLY: "NO_CATCH_NOR_FINALLY",
+  MessageKind.NO_COMMON_SUBTYPES: "NO_COMMON_SUBTYPES",
+  MessageKind.NO_CONTINUE_TARGET: "NO_CONTINUE_TARGET",
+  MessageKind.NO_INSTANCE_AVAILABLE: "NO_INSTANCE_AVAILABLE",
+  MessageKind.NO_MATCHING_CONSTRUCTOR: "NO_MATCHING_CONSTRUCTOR",
+  MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT: "NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT",
+  MessageKind.NO_STATIC_OVERRIDE: "NO_STATIC_OVERRIDE",
+  MessageKind.NO_STATIC_OVERRIDE_CONT: "NO_STATIC_OVERRIDE_CONT",
+  MessageKind.NO_SUCH_LIBRARY_MEMBER: "NO_SUCH_LIBRARY_MEMBER",
+  MessageKind.NO_SUCH_METHOD_IN_NATIVE: "NO_SUCH_METHOD_IN_NATIVE",
+  MessageKind.NO_SUCH_SUPER_MEMBER: "NO_SUCH_SUPER_MEMBER",
+  MessageKind.NO_SUPER_IN_STATIC: "NO_SUPER_IN_STATIC",
+  MessageKind.NO_THIS_AVAILABLE: "NO_THIS_AVAILABLE",
+  MessageKind.NON_CONST_BLOAT: "NON_CONST_BLOAT",
+  MessageKind.NOT_A_COMPILE_TIME_CONSTANT: "NOT_A_COMPILE_TIME_CONSTANT",
+  MessageKind.NOT_A_FIELD: "NOT_A_FIELD",
+  MessageKind.NOT_A_PREFIX: "NOT_A_PREFIX",
+  MessageKind.NOT_A_TYPE: "NOT_A_TYPE",
+  MessageKind.NOT_ASSIGNABLE: "NOT_ASSIGNABLE",
+  MessageKind.NOT_CALLABLE: "NOT_CALLABLE",
+  MessageKind.NOT_INSTANCE_FIELD: "NOT_INSTANCE_FIELD",
+  MessageKind.NOT_MORE_SPECIFIC: "NOT_MORE_SPECIFIC",
+  MessageKind.NOT_MORE_SPECIFIC_SUBTYPE: "NOT_MORE_SPECIFIC_SUBTYPE",
+  MessageKind.NOT_MORE_SPECIFIC_SUGGESTION: "NOT_MORE_SPECIFIC_SUGGESTION",
+  MessageKind.NULL_NOT_ALLOWED: "NULL_NOT_ALLOWED",
+  MessageKind.ONLY_ONE_LIBRARY_TAG: "ONLY_ONE_LIBRARY_TAG",
+  MessageKind.OPERATOR_NAMED_PARAMETERS: "OPERATOR_NAMED_PARAMETERS",
+  MessageKind.OPERATOR_NOT_FOUND: "OPERATOR_NOT_FOUND",
+  MessageKind.OPERATOR_OPTIONAL_PARAMETERS: "OPERATOR_OPTIONAL_PARAMETERS",
+  MessageKind.OPTIONAL_PARAMETER_IN_CATCH: "OPTIONAL_PARAMETER_IN_CATCH",
+  MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE: "OVERRIDE_EQUALS_NOT_HASH_CODE",
+  MessageKind.PARAMETER_NAME_EXPECTED: "PARAMETER_NAME_EXPECTED",
+  MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH: "PARAMETER_WITH_MODIFIER_IN_CATCH",
+  MessageKind.PARAMETER_WITH_TYPE_IN_CATCH: "PARAMETER_WITH_TYPE_IN_CATCH",
+  MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION: "PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION",
+  MessageKind.PATCH_NO_GETTER: "PATCH_NO_GETTER",
+  MessageKind.PATCH_NO_SETTER: "PATCH_NO_SETTER",
+  MessageKind.PATCH_NON_CLASS: "PATCH_NON_CLASS",
+  MessageKind.PATCH_NON_CONSTRUCTOR: "PATCH_NON_CONSTRUCTOR",
+  MessageKind.PATCH_NON_EXISTING: "PATCH_NON_EXISTING",
+  MessageKind.PATCH_NON_EXTERNAL: "PATCH_NON_EXTERNAL",
+  MessageKind.PATCH_NON_FUNCTION: "PATCH_NON_FUNCTION",
+  MessageKind.PATCH_NON_GETTER: "PATCH_NON_GETTER",
+  MessageKind.PATCH_NON_SETTER: "PATCH_NON_SETTER",
+  MessageKind.PATCH_NONPATCHABLE: "PATCH_NONPATCHABLE",
+  MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH: "PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH",
+  MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH: "PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH",
+  MessageKind.PATCH_PARAMETER_MISMATCH: "PATCH_PARAMETER_MISMATCH",
+  MessageKind.PATCH_PARAMETER_TYPE_MISMATCH: "PATCH_PARAMETER_TYPE_MISMATCH",
+  MessageKind.PATCH_POINT_TO_CLASS: "PATCH_POINT_TO_CLASS",
+  MessageKind.PATCH_POINT_TO_CONSTRUCTOR: "PATCH_POINT_TO_CONSTRUCTOR",
+  MessageKind.PATCH_POINT_TO_FUNCTION: "PATCH_POINT_TO_FUNCTION",
+  MessageKind.PATCH_POINT_TO_GETTER: "PATCH_POINT_TO_GETTER",
+  MessageKind.PATCH_POINT_TO_PARAMETER: "PATCH_POINT_TO_PARAMETER",
+  MessageKind.PATCH_POINT_TO_SETTER: "PATCH_POINT_TO_SETTER",
+  MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH: "PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH",
+  MessageKind.PATCH_RETURN_TYPE_MISMATCH: "PATCH_RETURN_TYPE_MISMATCH",
+  MessageKind.PLEASE_REPORT_THE_CRASH: "PLEASE_REPORT_THE_CRASH",
+  MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS: "POSITIONAL_PARAMETER_WITH_EQUALS",
+  MessageKind.POTENTIAL_MUTATION: "POTENTIAL_MUTATION",
+  MessageKind.POTENTIAL_MUTATION_HERE: "POTENTIAL_MUTATION_HERE",
+  MessageKind.POTENTIAL_MUTATION_IN_CLOSURE: "POTENTIAL_MUTATION_IN_CLOSURE",
+  MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE: "POTENTIAL_MUTATION_IN_CLOSURE_HERE",
+  MessageKind.PREAMBLE: "PREAMBLE",
+  MessageKind.PREFIX_AS_EXPRESSION: "PREFIX_AS_EXPRESSION",
+  MessageKind.PRIVATE_ACCESS: "PRIVATE_ACCESS",
+  MessageKind.PRIVATE_IDENTIFIER: "PRIVATE_IDENTIFIER",
+  MessageKind.PRIVATE_NAMED_PARAMETER: "PRIVATE_NAMED_PARAMETER",
+  MessageKind.READ_SCRIPT_ERROR: "READ_SCRIPT_ERROR",
+  MessageKind.READ_SELF_ERROR: "READ_SELF_ERROR",
+  MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE: "REDIRECTING_CONSTRUCTOR_CYCLE",
+  MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY: "REDIRECTING_CONSTRUCTOR_HAS_BODY",
+  MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER: "REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER",
+  MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT: "REDIRECTING_FACTORY_WITH_DEFAULT",
+  MessageKind.REFERENCE_IN_INITIALIZATION: "REFERENCE_IN_INITIALIZATION",
+  MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT: "REQUIRED_PARAMETER_WITH_DEFAULT",
+  MessageKind.RETURN_IN_GENERATOR: "RETURN_IN_GENERATOR",
+  MessageKind.RETURN_NOTHING: "RETURN_NOTHING",
+  MessageKind.RETURN_VALUE_IN_VOID: "RETURN_VALUE_IN_VOID",
+  MessageKind.SETTER_MISMATCH: "SETTER_MISMATCH",
+  MessageKind.SETTER_NOT_FOUND: "SETTER_NOT_FOUND",
+  MessageKind.SETTER_NOT_FOUND_IN_SUPER: "SETTER_NOT_FOUND_IN_SUPER",
+  MessageKind.STATIC_FUNCTION_BLOAT: "STATIC_FUNCTION_BLOAT",
+  MessageKind.STRING_EXPECTED: "STRING_EXPECTED",
+  MessageKind.SUPER_CALL_TO_FACTORY: "SUPER_CALL_TO_FACTORY",
+  MessageKind.SUPER_INITIALIZER_IN_OBJECT: "SUPER_INITIALIZER_IN_OBJECT",
+  MessageKind.SWITCH_CASE_FORBIDDEN: "SWITCH_CASE_FORBIDDEN",
+  MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL: "SWITCH_CASE_TYPES_NOT_EQUAL",
+  MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE: "SWITCH_CASE_TYPES_NOT_EQUAL_CASE",
+  MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS: "SWITCH_CASE_VALUE_OVERRIDES_EQUALS",
+  MessageKind.TERNARY_OPERATOR_BAD_ARITY: "TERNARY_OPERATOR_BAD_ARITY",
+  MessageKind.THIS_CALL_TO_FACTORY: "THIS_CALL_TO_FACTORY",
+  MessageKind.THIS_IS_THE_DECLARATION: "THIS_IS_THE_DECLARATION",
+  MessageKind.THIS_IS_THE_METHOD: "THIS_IS_THE_METHOD",
+  MessageKind.THIS_IS_THE_PART_OF_TAG: "THIS_IS_THE_PART_OF_TAG",
+  MessageKind.THIS_PROPERTY: "THIS_PROPERTY",
+  MessageKind.THROW_WITHOUT_EXPRESSION: "THROW_WITHOUT_EXPRESSION",
+  MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC: "TOP_LEVEL_VARIABLE_DECLARED_STATIC",
+  MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH: "TYPE_ARGUMENT_COUNT_MISMATCH",
+  MessageKind.TYPE_VARIABLE_IN_CONSTANT: "TYPE_VARIABLE_IN_CONSTANT",
+  MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER: "TYPE_VARIABLE_WITHIN_STATIC_MEMBER",
+  MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT: "TYPEDEF_FORMAL_WITH_DEFAULT",
+  MessageKind.UNARY_OPERATOR_BAD_ARITY: "UNARY_OPERATOR_BAD_ARITY",
+  MessageKind.UNBOUND_LABEL: "UNBOUND_LABEL",
+  MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER: "UNIMPLEMENTED_EXPLICIT_GETTER",
+  MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER: "UNIMPLEMENTED_EXPLICIT_SETTER",
+  MessageKind.UNIMPLEMENTED_GETTER: "UNIMPLEMENTED_GETTER",
+  MessageKind.UNIMPLEMENTED_GETTER_ONE: "UNIMPLEMENTED_GETTER_ONE",
+  MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER: "UNIMPLEMENTED_IMPLICIT_GETTER",
+  MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER: "UNIMPLEMENTED_IMPLICIT_SETTER",
+  MessageKind.UNIMPLEMENTED_METHOD: "UNIMPLEMENTED_METHOD",
+  MessageKind.UNIMPLEMENTED_METHOD_CONT: "UNIMPLEMENTED_METHOD_CONT",
+  MessageKind.UNIMPLEMENTED_METHOD_ONE: "UNIMPLEMENTED_METHOD_ONE",
+  MessageKind.UNIMPLEMENTED_SETTER: "UNIMPLEMENTED_SETTER",
+  MessageKind.UNIMPLEMENTED_SETTER_ONE: "UNIMPLEMENTED_SETTER_ONE",
+  MessageKind.UNMATCHED_TOKEN: "UNMATCHED_TOKEN",
+  MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP: "UNRECOGNIZED_VERSION_OF_LOOKUP_MAP",
+  MessageKind.UNSUPPORTED_BANG_EQ_EQ: "UNSUPPORTED_BANG_EQ_EQ",
+  MessageKind.UNSUPPORTED_EQ_EQ_EQ: "UNSUPPORTED_EQ_EQ_EQ",
+  MessageKind.UNSUPPORTED_LITERAL_SYMBOL: "UNSUPPORTED_LITERAL_SYMBOL",
+  MessageKind.UNSUPPORTED_PREFIX_PLUS: "UNSUPPORTED_PREFIX_PLUS",
+  MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP: "UNSUPPORTED_THROW_WITHOUT_EXP",
+  MessageKind.UNTERMINATED_COMMENT: "UNTERMINATED_COMMENT",
+  MessageKind.UNTERMINATED_STRING: "UNTERMINATED_STRING",
+  MessageKind.UNTERMINATED_TOKEN: "UNTERMINATED_TOKEN",
+  MessageKind.UNUSED_CLASS: "UNUSED_CLASS",
+  MessageKind.UNUSED_LABEL: "UNUSED_LABEL",
+  MessageKind.UNUSED_METHOD: "UNUSED_METHOD",
+  MessageKind.UNUSED_TYPEDEF: "UNUSED_TYPEDEF",
+  MessageKind.VAR_FUNCTION_TYPE_PARAMETER: "VAR_FUNCTION_TYPE_PARAMETER",
+  MessageKind.VOID_EXPRESSION: "VOID_EXPRESSION",
+  MessageKind.VOID_NOT_ALLOWED: "VOID_NOT_ALLOWED",
+  MessageKind.VOID_VARIABLE: "VOID_VARIABLE",
+  MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT: "WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT",
+  MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT: "WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT",
+  MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY: "YIELDING_MODIFIER_ON_ARROW_BODY",
+};
+
 /// A message template for an error, warning, hint or info message generated
 /// by the compiler. Each template is associated with a [MessageKind] that
 /// uniquely identifies the message template.
 // TODO(johnnniwinther): For Infos, consider adding a reference to the
 // error/warning/hint that they belong to.
 class MessageTemplate {
   final MessageKind kind;
 
+  final String id;
+
   /// Should describe what is wrong and why.
   final String template;
 
   /// Should describe how to fix the problem. Elided when using --terse option.
   final String howToFix;
 
   /**
    *  Examples will be checked by
    *  tests/compiler/dart2js/message_kind_test.dart.
    *
    *  An example is either a String containing the example source code or a Map
    *  from filenames to source code. In the latter case, the filename for the
    *  main library code must be 'main.dart'.
    */
   final List examples;
 
   /// Additional options needed for the examples to work.
   final List<String> options;
 
   const MessageTemplate(
       this.kind,
+      this.id,
       this.template,
-      {this.howToFix,
-       this.examples,
-       this.options: const <String>[]});
-
-  /// All templates used by the compiler.
-  ///
-  /// The map is complete mapping from [MessageKind] to their corresponding
-  /// [MessageTemplate].
-  static const Map<MessageKind, MessageTemplate> TEMPLATES =
-    const <MessageKind, MessageTemplate>{
-      /// Do not use this. It is here for legacy and debugging. It violates item
-      /// 4 of the guide lines for error messages in the beginning of the file.
-      MessageKind.GENERIC:
-        const MessageTemplate(MessageKind.GENERIC, '#{text}'),
-
-      MessageKind.NOT_ASSIGNABLE:
-        const MessageTemplate(MessageKind.NOT_ASSIGNABLE,
-          "'#{fromType}' is not assignable to '#{toType}'."),
-
-      MessageKind.FORIN_NOT_ASSIGNABLE:
-        const MessageTemplate(MessageKind.FORIN_NOT_ASSIGNABLE,
-          "The element type '#{currentType}' of '#{expressionType}' "
-          "is not assignable to '#{elementType}'."),
-
-      MessageKind.VOID_EXPRESSION:
-        const MessageTemplate(MessageKind.VOID_EXPRESSION,
-          "Expression does not yield a value."),
-
-      MessageKind.VOID_VARIABLE:
-        const MessageTemplate(MessageKind.VOID_VARIABLE,
-          "Variable cannot be of type void."),
-
-      MessageKind.RETURN_VALUE_IN_VOID:
-        const MessageTemplate(MessageKind.RETURN_VALUE_IN_VOID,
-          "Cannot return value from void function."),
-
-      MessageKind.RETURN_NOTHING:
-        const MessageTemplate(MessageKind.RETURN_NOTHING,
-          "Value of type '#{returnType}' expected."),
-
-      MessageKind.MISSING_ARGUMENT:
-        const MessageTemplate(MessageKind.MISSING_ARGUMENT,
-          "Missing argument of type '#{argumentType}'."),
-
-      MessageKind.ADDITIONAL_ARGUMENT:
-        const MessageTemplate(MessageKind.ADDITIONAL_ARGUMENT,
-          "Additional argument."),
-
-      MessageKind.NAMED_ARGUMENT_NOT_FOUND:
-        const MessageTemplate(MessageKind.NAMED_ARGUMENT_NOT_FOUND,
-          "No named argument '#{argumentName}' found on method."),
-
-      MessageKind.MEMBER_NOT_FOUND:
-        const MessageTemplate(MessageKind.MEMBER_NOT_FOUND,
-          "No member named '#{memberName}' in class '#{className}'."),
-
-      MessageKind.AWAIT_MEMBER_NOT_FOUND:
-        const MessageTemplate(MessageKind.AWAIT_MEMBER_NOT_FOUND,
-          "No member named 'await' in class '#{className}'.",
-          howToFix: "Did you mean to add the 'async' marker "
-                    "to '#{functionName}'?",
-          examples: const ["""
-class A {
-  m() => await -3;
-}
-main() => new A().m();
-"""]),
-
-      MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE:
-        const MessageTemplate(MessageKind.AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE,
-          "No member named 'await' in class '#{className}'.",
-          howToFix: "Did you mean to add the 'async' marker "
-                    "to the enclosing function?",
-          examples: const ["""
-class A {
-  m() => () => await -3;
-}
-main() => new A().m();
-"""]),
-
-      MessageKind.METHOD_NOT_FOUND:
-        const MessageTemplate(MessageKind.METHOD_NOT_FOUND,
-          "No method named '#{memberName}' in class '#{className}'."),
-
-      MessageKind.OPERATOR_NOT_FOUND:
-        const MessageTemplate(MessageKind.OPERATOR_NOT_FOUND,
-          "No operator '#{memberName}' in class '#{className}'."),
-
-      MessageKind.SETTER_NOT_FOUND:
-        const MessageTemplate(MessageKind.SETTER_NOT_FOUND,
-          "No setter named '#{memberName}' in class '#{className}'."),
-
-      MessageKind.SETTER_NOT_FOUND_IN_SUPER:
-        const MessageTemplate(MessageKind.SETTER_NOT_FOUND_IN_SUPER,
-          "No setter named '#{name}' in superclass of '#{className}'."),
-
-      MessageKind.GETTER_NOT_FOUND:
-        const MessageTemplate(MessageKind.GETTER_NOT_FOUND,
-          "No getter named '#{memberName}' in class '#{className}'."),
-
-      MessageKind.NOT_CALLABLE:
-        const MessageTemplate(MessageKind.NOT_CALLABLE,
-          "'#{elementName}' is not callable."),
-
-      MessageKind.MEMBER_NOT_STATIC:
-        const MessageTemplate(MessageKind.MEMBER_NOT_STATIC,
-          "'#{className}.#{memberName}' is not static."),
-
-      MessageKind.NO_INSTANCE_AVAILABLE:
-        const MessageTemplate(MessageKind.NO_INSTANCE_AVAILABLE,
-          "'#{name}' is only available in instance methods."),
-
-      MessageKind.NO_THIS_AVAILABLE:
-        const MessageTemplate(MessageKind.NO_THIS_AVAILABLE,
-          "'this' is only available in instance methods."),
-
-      MessageKind.PRIVATE_ACCESS:
-        const MessageTemplate(MessageKind.PRIVATE_ACCESS,
-          "'#{name}' is declared private within library "
-          "'#{libraryName}'."),
-
-      MessageKind.THIS_IS_THE_DECLARATION:
-        const MessageTemplate(MessageKind.THIS_IS_THE_DECLARATION,
-          "This is the declaration of '#{name}'."),
-
-      MessageKind.THIS_IS_THE_METHOD:
-        const MessageTemplate(MessageKind.THIS_IS_THE_METHOD,
-          "This is the method declaration."),
-
-      MessageKind.CANNOT_RESOLVE:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE,
-          "Cannot resolve '#{name}'."),
-
-      MessageKind.CANNOT_RESOLVE_AWAIT:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_AWAIT,
-          "Cannot resolve '#{name}'.",
-          howToFix: "Did you mean to add the 'async' marker "
-                    "to '#{functionName}'?",
-          examples: const [
-              "main() => await -3;",
-              "foo() => await -3; main() => foo();"
-          ]),
-
-      MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_AWAIT_IN_CLOSURE,
-          "Cannot resolve '#{name}'.",
-          howToFix: "Did you mean to add the 'async' marker "
-                    "to the enclosing function?",
-          examples: const [
-              "main() { (() => await -3)(); }",
-          ]),
-
-      MessageKind.CANNOT_RESOLVE_IN_INITIALIZER:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_IN_INITIALIZER,
-          "Cannot resolve '#{name}'. It would be implicitly looked up on this "
-          "instance, but instances are not available in initializers.",
-          howToFix: "Try correcting the unresolved reference or move the "
-              "initialization to a constructor body.",
-          examples: const ["""
-class A {
-  var test = unresolvedName;
-}
-main() => new A();
-"""]),
-
-      MessageKind.CANNOT_RESOLVE_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_CONSTRUCTOR,
-          "Cannot resolve constructor '#{constructorName}'."),
-
-      MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT:
-        const MessageTemplate(
-          MessageKind.CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT,
-          "cannot resolve constructor '#{constructorName}' "
-          "for implicit super call.",
-          howToFix: "Try explicitly invoking a constructor of the super class",
-          examples: const ["""
-class A {
-  A.foo() {}
-}
-class B extends A {
-  B();
-}
-main() => new B();
-"""]),
-
-      MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME:
-        const MessageTemplate(MessageKind.INVALID_UNNAMED_CONSTRUCTOR_NAME,
-          "Unnamed constructor name must be '#{name}'."),
-
-      MessageKind.INVALID_CONSTRUCTOR_NAME:
-        const MessageTemplate(MessageKind.INVALID_CONSTRUCTOR_NAME,
-          "Constructor name must start with '#{name}'."),
-
-      MessageKind.CANNOT_RESOLVE_TYPE:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_TYPE,
-          "Cannot resolve type '#{typeName}'."),
-
-      MessageKind.DUPLICATE_DEFINITION:
-        const MessageTemplate(MessageKind.DUPLICATE_DEFINITION,
-          "Duplicate definition of '#{name}'.",
-          howToFix: "Try to rename or remove this definition.",
-          examples: const ["""
-class C {
-  void f() {}
-  int get f => 1;
-}
-
-main() {
-  new C();
-}
-
-"""]),
-
-      MessageKind.EXISTING_DEFINITION:
-        const MessageTemplate(MessageKind.EXISTING_DEFINITION,
-          "Existing definition of '#{name}'."),
-
-      MessageKind.DUPLICATE_IMPORT:
-        const MessageTemplate(MessageKind.DUPLICATE_IMPORT,
-          "Duplicate import of '#{name}'."),
-
-      MessageKind.HIDDEN_IMPORT:
-        const MessageTemplate(MessageKind.HIDDEN_IMPORT,
-          "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
-          "from library '#{hidingUri}'.",
-          howToFix:
-            "Try adding 'hide #{name}' to the import of '#{hiddenUri}'.",
-          examples: const [
-              const {
-'main.dart':
-"""
-import 'dart:async'; // This imports a class Future.
-import 'future.dart';
-
-void main() => new Future();""",
-
-'future.dart':
-"""
-library future;
-
-class Future {}"""},
-
-          const {
-'main.dart':
-"""
-import 'future.dart';
-import 'dart:async'; // This imports a class Future.
-
-void main() => new Future();""",
-
-'future.dart':
-"""
-library future;
-
-class Future {}"""},
-
-          const {
-'main.dart':
-"""
-import 'export.dart';
-import 'dart:async'; // This imports a class Future.
-
-void main() => new Future();""",
-
-'future.dart':
-"""
-library future;
-
-class Future {}""",
-
-'export.dart':
-"""
-library export;
-
-export 'future.dart';"""},
-
-         const {
-'main.dart':
-"""
-import 'future.dart' as prefix;
-import 'dart:async' as prefix; // This imports a class Future.
-
-void main() => new prefix.Future();""",
-
-'future.dart':
-"""
-library future;
-
-class Future {}"""}]),
-
-
-      MessageKind.HIDDEN_IMPLICIT_IMPORT:
-        const MessageTemplate(MessageKind.HIDDEN_IMPLICIT_IMPORT,
-          "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
-          "from library '#{hidingUri}'.",
-          howToFix: "Try adding an explicit "
-                    "'import \"#{hiddenUri}\" hide #{name}'.",
-          examples: const [
-              const {
-'main.dart':
-"""
-// This hides the implicit import of class Type from dart:core.
-import 'type.dart';
-
-void main() => new Type();""",
-
-'type.dart':
-"""
-library type;
-
-class Type {}"""},
-          const {
-'conflictsWithDart.dart':
-"""
-library conflictsWithDart;
-
-class Duration {
-  static var x = 100;
-}
-""",
-
-'conflictsWithDartAsWell.dart':
-"""
-library conflictsWithDartAsWell;
-
-class Duration {
-  static var x = 100;
-}
-""",
-
-'main.dart':
-r"""
-library testDartConflicts;
-
-import 'conflictsWithDart.dart';
-import 'conflictsWithDartAsWell.dart';
-
-main() {
-  print("Hail Caesar ${Duration.x}");
-}
-"""}]),
-
-      MessageKind.DUPLICATE_EXPORT:
-        const MessageTemplate(MessageKind.DUPLICATE_EXPORT,
-          "Duplicate export of '#{name}'.",
-          howToFix: "Try adding 'hide #{name}' to one of the exports.",
-          examples: const [const {
-'main.dart': """
-export 'decl1.dart';
-export 'decl2.dart';
-
-main() {}""",
-'decl1.dart': "class Class {}",
-'decl2.dart': "class Class {}"}]),
-
-      MessageKind.DUPLICATE_EXPORT_CONT:
-        const MessageTemplate(MessageKind.DUPLICATE_EXPORT_CONT,
-          "This is another export of '#{name}'."),
-
-      MessageKind.DUPLICATE_EXPORT_DECL:
-        const MessageTemplate(MessageKind.DUPLICATE_EXPORT_DECL,
-          "The exported '#{name}' from export #{uriString} is defined here."),
-
-      MessageKind.EMPTY_HIDE:
-        const MessageTemplate(MessageKind.EMPTY_HIDE,
-            "Library '#{uri}' doesn't export a '#{name}' declaration.",
-      howToFix: "Try removing '#{name}' the 'hide' clause.",
-      examples: const [
-        const {
-            'main.dart': """
-import 'dart:core' hide Foo;
-
-main() {}"""},
-        const {
-'main.dart': """
-export 'dart:core' hide Foo;
-
-main() {}"""},
-]),
-
-      MessageKind.EMPTY_SHOW:
-        const MessageTemplate(MessageKind.EMPTY_SHOW,
-            "Library '#{uri}' doesn't export a '#{name}' declaration.",
-      howToFix: "Try removing '#{name}' from the 'show' clause.",
-      examples: const [
-        const {
-            'main.dart': """
-import 'dart:core' show Foo;
-
-main() {}"""},
-        const {
-'main.dart': """
-export 'dart:core' show Foo;
-
-main() {}"""},
-]),
-
-      MessageKind.NOT_A_TYPE:
-        const MessageTemplate(MessageKind.NOT_A_TYPE,
-          "'#{node}' is not a type."),
-
-      MessageKind.NOT_A_PREFIX:
-        const MessageTemplate(MessageKind.NOT_A_PREFIX,
-          "'#{node}' is not a prefix."),
-
-      MessageKind.PREFIX_AS_EXPRESSION:
-        const MessageTemplate(MessageKind.PREFIX_AS_EXPRESSION,
-          "Library prefix '#{prefix}' is not a valid expression."),
-
-      MessageKind.CANNOT_FIND_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.CANNOT_FIND_CONSTRUCTOR,
-          "Cannot find constructor '#{constructorName}' in class "
-          "'#{className}'."),
-
-      MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.CANNOT_FIND_UNNAMED_CONSTRUCTOR,
-          "Cannot find unnamed constructor in class "
-          "'#{className}'."),
-
-      MessageKind.CYCLIC_CLASS_HIERARCHY:
-        const MessageTemplate(MessageKind.CYCLIC_CLASS_HIERARCHY,
-          "'#{className}' creates a cycle in the class hierarchy."),
-
-      MessageKind.CYCLIC_REDIRECTING_FACTORY:
-        const MessageTemplate(MessageKind.CYCLIC_REDIRECTING_FACTORY,
-          'Redirecting factory leads to a cyclic redirection.'),
-
-      MessageKind.INVALID_RECEIVER_IN_INITIALIZER:
-        const MessageTemplate(MessageKind.INVALID_RECEIVER_IN_INITIALIZER,
-          "Field initializer expected."),
-
-      MessageKind.NO_SUPER_IN_STATIC:
-        const MessageTemplate(MessageKind.NO_SUPER_IN_STATIC,
-          "'super' is only available in instance methods."),
-
-      MessageKind.DUPLICATE_INITIALIZER:
-        const MessageTemplate(MessageKind.DUPLICATE_INITIALIZER,
-          "Field '#{fieldName}' is initialized more than once."),
-
-      MessageKind.ALREADY_INITIALIZED:
-        const MessageTemplate(MessageKind.ALREADY_INITIALIZED,
-          "'#{fieldName}' was already initialized here."),
-
-      MessageKind.INIT_STATIC_FIELD:
-        const MessageTemplate(MessageKind.INIT_STATIC_FIELD,
-          "Cannot initialize static field '#{fieldName}'."),
-
-      MessageKind.NOT_A_FIELD:
-        const MessageTemplate(MessageKind.NOT_A_FIELD,
-          "'#{fieldName}' is not a field."),
-
-      MessageKind.CONSTRUCTOR_CALL_EXPECTED:
-        const MessageTemplate(MessageKind.CONSTRUCTOR_CALL_EXPECTED,
-          "only call to 'this' or 'super' constructor allowed."),
-
-      MessageKind.INVALID_FOR_IN:
-        const MessageTemplate(MessageKind.INVALID_FOR_IN,
-          "Invalid for-in variable declaration."),
-
-      MessageKind.INVALID_INITIALIZER:
-        const MessageTemplate(MessageKind.INVALID_INITIALIZER,
-          "Invalid initializer."),
-
-      MessageKind.FUNCTION_WITH_INITIALIZER:
-        const MessageTemplate(MessageKind.FUNCTION_WITH_INITIALIZER,
-          "Only constructors can have initializers."),
-
-      MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE:
-        const MessageTemplate(MessageKind.REDIRECTING_CONSTRUCTOR_CYCLE,
-          "Cyclic constructor redirection."),
-
-      MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY:
-        const MessageTemplate(MessageKind.REDIRECTING_CONSTRUCTOR_HAS_BODY,
-          "Redirecting constructor can't have a body."),
-
-      MessageKind.CONST_CONSTRUCTOR_HAS_BODY:
-        const MessageTemplate(MessageKind.CONST_CONSTRUCTOR_HAS_BODY,
-          "Const constructor or factory can't have a body.",
-          howToFix: "Remove the 'const' keyword or the body",
-          examples: const ["""
-class C {
-  const C() {}
-}
-
-main() => new C();"""]),
-
-      MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER:
-        const MessageTemplate(
-          MessageKind.REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER,
-          "Redirecting constructor cannot have other initializers."),
-
-      MessageKind.SUPER_INITIALIZER_IN_OBJECT:
-        const MessageTemplate(MessageKind.SUPER_INITIALIZER_IN_OBJECT,
-          "'Object' cannot have a super initializer."),
-
-      MessageKind.DUPLICATE_SUPER_INITIALIZER:
-        const MessageTemplate(MessageKind.DUPLICATE_SUPER_INITIALIZER,
-          "Cannot have more than one super initializer."),
-
-      MessageKind.SUPER_CALL_TO_FACTORY:
-        const MessageTemplate(MessageKind.SUPER_CALL_TO_FACTORY,
-          "The target of the superinitializer must be a generative "
-          "constructor.",
-          howToFix: "Try calling another constructor on the superclass.",
-          examples: const ["""
-class Super {
-  factory Super() => null;
-}
-class Class extends Super {}
-main() => new Class();
-""", """
-class Super {
-  factory Super() => null;
-}
-class Class extends Super {
-  Class();
-}
-main() => new Class();
-""", """
-class Super {
-  factory Super() => null;
-}
-class Class extends Super {
-  Class() : super();
-}
-main() => new Class();
-""", """
-class Super {
-  factory Super.foo() => null;
-}
-class Class extends Super {
-  Class() : super.foo();
-}
-main() => new Class();
-"""]),
-
-      MessageKind.THIS_CALL_TO_FACTORY:
-        const MessageTemplate(MessageKind.THIS_CALL_TO_FACTORY,
-          "The target of the redirection clause must be a generative "
-          "constructor",
-        howToFix: "Try redirecting to another constructor.",
-        examples: const ["""
-class Class {
-  factory Class() => null;
-  Class.foo() : this();
-}
-main() => new Class.foo();
-""", """
-class Class {
-  factory Class.foo() => null;
-  Class() : this.foo();
-}
-main() => new Class();
-"""]),
-
-      MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS:
-        const MessageTemplate(MessageKind.INVALID_CONSTRUCTOR_ARGUMENTS,
-          "Arguments do not match the expected parameters of constructor "
-          "'#{constructorName}'."),
-
-      MessageKind.NO_MATCHING_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.NO_MATCHING_CONSTRUCTOR,
-          "'super' call arguments and constructor parameters do not match."),
-
-      MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT:
-        const MessageTemplate(MessageKind.NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT,
-              "Implicit 'super' call arguments and constructor parameters "
-              "do not match."),
-
-      MessageKind.CONST_CALLS_NON_CONST:
-        const MessageTemplate(MessageKind.CONST_CALLS_NON_CONST,
-          "'const' constructor cannot call a non-const constructor."),
-
-      MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT:
-        const MessageTemplate(MessageKind.CONST_CALLS_NON_CONST_FOR_IMPLICIT,
-              "'const' constructor cannot call a non-const constructor. "
-              "This constructor has an implicit call to a "
-              "super non-const constructor.",
-              howToFix: "Try making the super constructor const.",
-              examples: const ["""
-class C {
-  C(); // missing const
-}
-class D extends C {
-  final d;
-  const D(this.d);
-}
-main() => new D(0);"""]),
-
-      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS:
-        const MessageTemplate(
-          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS,
-          "Can't declare constructor 'const' on class #{className} "
-          "because the class contains non-final instance fields.",
-          howToFix: "Try making all fields final.",
-          examples: const ["""
-class C {
-  // 'a' must be declared final to allow for the const constructor.
-  var a;
-  const C(this.a);
-}
-
-main() => new C(0);"""]),
-
-      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD:
-        const MessageTemplate(
-          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD,
-          "This non-final field prevents using const constructors."),
-
-      MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR:
-        const MessageTemplate(
-          MessageKind.CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR,
-          "This const constructor is not allowed due to "
-          "non-final fields."),
-
-
-      MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED:
-        const MessageTemplate(MessageKind.INITIALIZING_FORMAL_NOT_ALLOWED,
-          "Initializing formal parameter only allowed in generative "
-          "constructor."),
-
-      MessageKind.INVALID_PARAMETER:
-        const MessageTemplate(MessageKind.INVALID_PARAMETER,
-          "Cannot resolve parameter."),
-
-      MessageKind.NOT_INSTANCE_FIELD:
-        const MessageTemplate(MessageKind.NOT_INSTANCE_FIELD,
-          "'#{fieldName}' is not an instance field."),
-
-      MessageKind.THIS_PROPERTY:
-        const MessageTemplate(MessageKind.THIS_PROPERTY,
-          "Expected an identifier."),
-
-      MessageKind.NO_CATCH_NOR_FINALLY:
-        const MessageTemplate(MessageKind.NO_CATCH_NOR_FINALLY,
-          "Expected 'catch' or 'finally'."),
-
-      MessageKind.EMPTY_CATCH_DECLARATION:
-        const MessageTemplate(MessageKind.EMPTY_CATCH_DECLARATION,
-          "Expected an identifier in catch declaration."),
-
-      MessageKind.EXTRA_CATCH_DECLARATION:
-        const MessageTemplate(MessageKind.EXTRA_CATCH_DECLARATION,
-          "Extra parameter in catch declaration."),
-
-      MessageKind.PARAMETER_WITH_TYPE_IN_CATCH:
-        const MessageTemplate(MessageKind.PARAMETER_WITH_TYPE_IN_CATCH,
-          "Cannot use type annotations in catch."),
-
-      MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH:
-        const MessageTemplate(MessageKind.PARAMETER_WITH_MODIFIER_IN_CATCH,
-          "Cannot use modifiers in catch."),
-
-      MessageKind.OPTIONAL_PARAMETER_IN_CATCH:
-        const MessageTemplate(MessageKind.OPTIONAL_PARAMETER_IN_CATCH,
-          "Cannot use optional parameters in catch."),
-
-      MessageKind.THROW_WITHOUT_EXPRESSION:
-        const MessageTemplate(MessageKind.THROW_WITHOUT_EXPRESSION,
-          "Cannot use re-throw outside of catch block "
-          "(expression expected after 'throw')."),
-
-      MessageKind.UNBOUND_LABEL:
-        const MessageTemplate(MessageKind.UNBOUND_LABEL,
-          "Cannot resolve label '#{labelName}'."),
-
-      MessageKind.NO_BREAK_TARGET:
-        const MessageTemplate(MessageKind.NO_BREAK_TARGET,
-          "'break' statement not inside switch or loop."),
-
-      MessageKind.NO_CONTINUE_TARGET:
-        const MessageTemplate(MessageKind.NO_CONTINUE_TARGET,
-          "'continue' statement not inside loop."),
-
-      MessageKind.EXISTING_LABEL:
-        const MessageTemplate(MessageKind.EXISTING_LABEL,
-          "Original declaration of duplicate label '#{labelName}'."),
-
-      MessageKind.DUPLICATE_LABEL:
-        const MessageTemplate(MessageKind.DUPLICATE_LABEL,
-          "Duplicate declaration of label '#{labelName}'."),
-
-      MessageKind.UNUSED_LABEL:
-        const MessageTemplate(MessageKind.UNUSED_LABEL,
-          "Unused label '#{labelName}'."),
-
-      MessageKind.INVALID_CONTINUE:
-        const MessageTemplate(MessageKind.INVALID_CONTINUE,
-          "Target of continue is not a loop or switch case."),
-
-      MessageKind.INVALID_BREAK:
-        const MessageTemplate(MessageKind.INVALID_BREAK,
-          "Target of break is not a statement."),
-
-      MessageKind.DUPLICATE_TYPE_VARIABLE_NAME:
-        const MessageTemplate(MessageKind.DUPLICATE_TYPE_VARIABLE_NAME,
-          "Type variable '#{typeVariableName}' already declared."),
-
-      MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER:
-        const MessageTemplate(MessageKind.TYPE_VARIABLE_WITHIN_STATIC_MEMBER,
-              "Cannot refer to type variable '#{typeVariableName}' "
-              "within a static member."),
-
-      MessageKind.TYPE_VARIABLE_IN_CONSTANT:
-        const MessageTemplate(MessageKind.TYPE_VARIABLE_IN_CONSTANT,
-          "Constant expressions can't refer to type variables.",
-          howToFix: "Try removing the type variable or replacing it with a "
-                    "concrete type.",
-          examples: const ["""
-class C<T> {
-  const C();
-
-  m(T t) => const C<T>();
-}
-
-void main() => new C().m(null);
-"""
-]),
-
-      MessageKind.INVALID_TYPE_VARIABLE_BOUND:
-        const MessageTemplate(MessageKind.INVALID_TYPE_VARIABLE_BOUND,
-          "'#{typeArgument}' is not a subtype of bound '#{bound}' for "
-          "type variable '#{typeVariable}' of type '#{thisType}'.",
-          howToFix: "Try to change or remove the type argument.",
-          examples: const ["""
-class C<T extends num> {}
-
-// 'String' is not a valid instantiation of T with bound num.'.
-main() => new C<String>();
-"""]),
-
-      MessageKind.INVALID_USE_OF_SUPER:
-        const MessageTemplate(MessageKind.INVALID_USE_OF_SUPER,
-          "'super' not allowed here."),
-
-      MessageKind.INVALID_CASE_DEFAULT:
-        const MessageTemplate(MessageKind.INVALID_CASE_DEFAULT,
-          "'default' only allowed on last case of a switch."),
-
-      MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL:
-        const MessageTemplate(MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL,
-          "'case' expressions do not all have type '#{type}'."),
-
-      MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE:
-        const MessageTemplate(MessageKind.SWITCH_CASE_TYPES_NOT_EQUAL_CASE,
-          "'case' expression of type '#{type}'."),
-
-      MessageKind.SWITCH_CASE_FORBIDDEN:
-        const MessageTemplate(MessageKind.SWITCH_CASE_FORBIDDEN,
-          "'case' expression may not be of type '#{type}'."),
-
-      MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS:
-        const MessageTemplate(MessageKind.SWITCH_CASE_VALUE_OVERRIDES_EQUALS,
-              "'case' expression type '#{type}' overrides 'operator =='."),
-
-      MessageKind.INVALID_ARGUMENT_AFTER_NAMED:
-        const MessageTemplate(MessageKind.INVALID_ARGUMENT_AFTER_NAMED,
-          "Unnamed argument after named argument."),
-
-      MessageKind.NOT_A_COMPILE_TIME_CONSTANT:
-        const MessageTemplate(MessageKind.NOT_A_COMPILE_TIME_CONSTANT,
-          "Not a compile-time constant."),
-
-      MessageKind.DEFERRED_COMPILE_TIME_CONSTANT:
-        const MessageTemplate(MessageKind.DEFERRED_COMPILE_TIME_CONSTANT,
-          "A deferred value cannot be used as a compile-time constant."),
-
-      MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION:
-        const MessageTemplate(
-          MessageKind.DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION,
-          "A deferred class cannot be used to create a "
-          "compile-time constant."),
-
-      MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS:
-        const MessageTemplate(MessageKind.CYCLIC_COMPILE_TIME_CONSTANTS,
-          "Cycle in the compile-time constant computation."),
-
-      MessageKind.CONSTRUCTOR_IS_NOT_CONST:
-        const MessageTemplate(MessageKind.CONSTRUCTOR_IS_NOT_CONST,
-          "Constructor is not a 'const' constructor."),
-
-      MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS:
-        const MessageTemplate(MessageKind.CONST_MAP_KEY_OVERRIDES_EQUALS,
-              "Const-map key type '#{type}' overrides 'operator =='."),
-
-      MessageKind.NO_SUCH_LIBRARY_MEMBER:
-        const MessageTemplate(MessageKind.NO_SUCH_LIBRARY_MEMBER,
-          "'#{libraryName}' has no member named '#{memberName}'."),
-
-      MessageKind.CANNOT_INSTANTIATE_TYPEDEF:
-        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_TYPEDEF,
-          "Cannot instantiate typedef '#{typedefName}'."),
-
-      MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT:
-        const MessageTemplate(MessageKind.REQUIRED_PARAMETER_WITH_DEFAULT,
-          "Non-optional parameters can't have a default value.",
-          howToFix:
-            "Try removing the default value or making the parameter optional.",
-          examples: const ["""
-main() {
-  foo(a: 1) => print(a);
-  foo(2);
-}""", """
-main() {
-  foo(a = 1) => print(a);
-  foo(2);
-}"""]),
-
-      MessageKind.NAMED_PARAMETER_WITH_EQUALS:
-        const MessageTemplate(MessageKind.NAMED_PARAMETER_WITH_EQUALS,
-          "Named optional parameters can't use '=' to specify a default "
-          "value.",
-          howToFix: "Try replacing '=' with ':'.",
-          examples: const ["""
-main() {
-  foo({a = 1}) => print(a);
-  foo(a: 2);
-}"""]),
-
-      MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS:
-        const MessageTemplate(MessageKind.POSITIONAL_PARAMETER_WITH_EQUALS,
-          "Positional optional parameters can't use ':' to specify a "
-          "default value.",
-          howToFix: "Try replacing ':' with '='.",
-          examples: const ["""
-main() {
-  foo([a: 1]) => print(a);
-  foo(2);
-}"""]),
-
-      MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT:
-        const MessageTemplate(MessageKind.TYPEDEF_FORMAL_WITH_DEFAULT,
-          "A parameter of a typedef can't specify a default value.",
-          howToFix:
-            "Try removing the default value.",
-          examples: const ["""
-typedef void F([int arg = 0]);
-
-main() {
-  F f;
-}""", """
-typedef void F({int arg: 0});
-
-main() {
-  F f;
-}"""]),
-
-      MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT:
-        const MessageTemplate(MessageKind.FUNCTION_TYPE_FORMAL_WITH_DEFAULT,
-          "A function type parameter can't specify a default value.",
-          howToFix:
-            "Try removing the default value.",
-          examples: const ["""
-foo(f(int i, [a = 1])) {}
-
-main() {
-  foo(1, 2);
-}""", """
-foo(f(int i, {a: 1})) {}
-
-main() {
-  foo(1, a: 2);
-}"""]),
-
-      MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT:
-        const MessageTemplate(MessageKind.REDIRECTING_FACTORY_WITH_DEFAULT,
-          "A parameter of a redirecting factory constructor can't specify a "
-          "default value.",
-          howToFix:
-            "Try removing the default value.",
-          examples: const ["""
-class A {
-  A([a]);
-  factory A.foo([a = 1]) = A;
-}
-
-main() {
-  new A.foo(1);
-}""", """
-class A {
-  A({a});
-  factory A.foo({a: 1}) = A;
-}
-
-main() {
-  new A.foo(a: 1);
-}"""]),
-
-      MessageKind.FORMAL_DECLARED_CONST:
-        const MessageTemplate(MessageKind.FORMAL_DECLARED_CONST,
-          "A formal parameter can't be declared const.",
-          howToFix: "Try removing 'const'.",
-          examples: const ["""
-foo(const x) {}
-main() => foo(42);
-""", """
-foo({const x}) {}
-main() => foo(42);
-""", """
-foo([const x]) {}
-main() => foo(42);
-"""]),
-
-      MessageKind.FORMAL_DECLARED_STATIC:
-        const MessageTemplate(MessageKind.FORMAL_DECLARED_STATIC,
-          "A formal parameter can't be declared static.",
-          howToFix: "Try removing 'static'.",
-          examples: const ["""
-foo(static x) {}
-main() => foo(42);
-""", """
-foo({static x}) {}
-main() => foo(42);
-""", """
-foo([static x]) {}
-main() => foo(42);
-"""]),
-
-      MessageKind.FINAL_FUNCTION_TYPE_PARAMETER:
-        const MessageTemplate(MessageKind.FINAL_FUNCTION_TYPE_PARAMETER,
-          "A function type parameter can't be declared final.",
-          howToFix: "Try removing 'final'.",
-          examples: const ["""
-foo(final int x(int a)) {}
-main() => foo((y) => 42);
-""", """
-foo({final int x(int a)}) {}
-main() => foo((y) => 42);
-""", """
-foo([final int x(int a)]) {}
-main() => foo((y) => 42);
-"""]),
-
-      MessageKind.VAR_FUNCTION_TYPE_PARAMETER:
-        const MessageTemplate(MessageKind.VAR_FUNCTION_TYPE_PARAMETER,
-          "A function type parameter can't be declared with 'var'.",
-          howToFix: "Try removing 'var'.",
-          examples: const ["""
-foo(var int x(int a)) {}
-main() => foo((y) => 42);
-""", """
-foo({var int x(int a)}) {}
-main() => foo((y) => 42);
-""", """
-foo([var int x(int a)]) {}
-main() => foo((y) => 42);
-"""]),
-
-      MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE:
-        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_TYPE_VARIABLE,
-          "Cannot instantiate type variable '#{typeVariableName}'."),
-
-      MessageKind.CYCLIC_TYPE_VARIABLE:
-        const MessageTemplate(MessageKind.CYCLIC_TYPE_VARIABLE,
-          "Type variable '#{typeVariableName}' is a supertype of itself."),
-
-      MessageKind.CYCLIC_TYPEDEF:
-        const MessageTemplate(MessageKind.CYCLIC_TYPEDEF,
-          "A typedef can't refer to itself.",
-          howToFix: "Try removing all references to '#{typedefName}' "
-                    "in the definition of '#{typedefName}'.",
-          examples: const ["""
-typedef F F(); // The return type 'F' is a self-reference.
-main() { F f = null; }"""]),
-
-      MessageKind.CYCLIC_TYPEDEF_ONE:
-        const MessageTemplate(MessageKind.CYCLIC_TYPEDEF_ONE,
-          "A typedef can't refer to itself through another typedef.",
-          howToFix:
-            "Try removing all references to "
-            "'#{otherTypedefName}' in the definition of '#{typedefName}'.",
-          examples: const ["""
-typedef G F(); // The return type 'G' is a self-reference through typedef 'G'.
-typedef F G(); // The return type 'F' is a self-reference through typedef 'F'.
-main() { F f = null; }""",
-"""
-typedef G F(); // The return type 'G' creates a self-reference.
-typedef H G(); // The return type 'H' creates a self-reference.
-typedef H(F f); // The argument type 'F' creates a self-reference.
-main() { F f = null; }"""]),
-
-      MessageKind.CLASS_NAME_EXPECTED:
-        const MessageTemplate(MessageKind.CLASS_NAME_EXPECTED,
-          "Class name expected."),
-
-      MessageKind.CANNOT_EXTEND:
-        const MessageTemplate(MessageKind.CANNOT_EXTEND,
-          "'#{type}' cannot be extended."),
-
-      MessageKind.CANNOT_IMPLEMENT:
-        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT,
-          "'#{type}' cannot be implemented."),
-
-      // TODO(johnnwinther): Split messages into reasons for malformedness.
-      MessageKind.CANNOT_EXTEND_MALFORMED:
-        const MessageTemplate(MessageKind.CANNOT_EXTEND_MALFORMED,
-          "Class '#{className}' can't extend the type '#{malformedType}' "
-          "because it is malformed.",
-          howToFix:
-            "Try correcting the malformed type annotation or removing the "
-            "'extends' clause.",
-          examples: const ["""
-class A extends Malformed {}
-main() => new A();"""]),
-
-      MessageKind.CANNOT_IMPLEMENT_MALFORMED:
-        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT_MALFORMED,
-          "Class '#{className}' can't implement the type '#{malformedType}' "
-          "because it is malformed.",
-          howToFix:
-            "Try correcting the malformed type annotation or removing the "
-            "type from the 'implements' clause.",
-          examples: const ["""
-class A implements Malformed {}
-main() => new A();"""]),
-
-      MessageKind.CANNOT_MIXIN_MALFORMED:
-        const MessageTemplate(MessageKind.CANNOT_MIXIN_MALFORMED,
-          "Class '#{className}' can't mixin the type '#{malformedType}' "
-          "because it is malformed.",
-          howToFix:
-            "Try correcting the malformed type annotation or removing the "
-            "type from the 'with' clause.",
-          examples: const ["""
-class A extends Object with Malformed {}
-main() => new A();"""]),
-
-      MessageKind.CANNOT_MIXIN:
-        const MessageTemplate(MessageKind.CANNOT_MIXIN,
-          "The type '#{type}' can't be mixed in.",
-          howToFix: "Try removing '#{type}' from the 'with' clause.",
-          examples: const ["""
-class C extends Object with String {}
-
-main() => new C();
-""", """
-typedef C = Object with String;
-
-main() => new C();
-"""]),
-
-      MessageKind.CANNOT_EXTEND_ENUM:
-        const MessageTemplate(MessageKind.CANNOT_EXTEND_ENUM,
-          "Class '#{className}' can't extend the type '#{enumType}' because "
-          "it is declared by an enum.",
-          howToFix: "Try making '#{enumType}' a normal class or removing the "
-            "'extends' clause.",
-          examples: const ["""
-enum Enum { A }
-class B extends Enum {}
-main() => new B();"""]),
-
-      MessageKind.CANNOT_IMPLEMENT_ENUM:
-        const MessageTemplate(MessageKind.CANNOT_IMPLEMENT_ENUM,
-          "Class '#{className}' can't implement the type '#{enumType}' "
-          "because it is declared by an enum.",
-          howToFix: "Try making '#{enumType}' a normal class or removing the "
-            "type from the 'implements' clause.",
-          examples: const ["""
-enum Enum { A }
-class B implements Enum {}
-main() => new B();"""]),
-
-      MessageKind.CANNOT_MIXIN_ENUM:
-        const MessageTemplate(MessageKind.CANNOT_MIXIN_ENUM,
-          "Class '#{className}' can't mixin the type '#{enumType}' because it "
-          "is declared by an enum.",
-          howToFix: "Try making '#{enumType}' a normal class or removing the "
-            "type from the 'with' clause.",
-          examples: const ["""
-enum Enum { A }
-class B extends Object with Enum {}
-main() => new B();"""]),
-
-      MessageKind.CANNOT_INSTANTIATE_ENUM:
-        const MessageTemplate(MessageKind.CANNOT_INSTANTIATE_ENUM,
-          "Enum type '#{enumName}' cannot be instantiated.",
-          howToFix: "Try making '#{enumType}' a normal class or use an enum "
-                    "constant.",
-          examples: const ["""
-enum Enum { A }
-main() => new Enum(0);""", """
-enum Enum { A }
-main() => const Enum(0);"""]),
-
-      MessageKind.EMPTY_ENUM_DECLARATION:
-        const MessageTemplate(MessageKind.EMPTY_ENUM_DECLARATION,
-          "Enum '#{enumName}' must contain at least one value.",
-          howToFix: "Try adding an enum constant or making #{enumName} a "
-                    "normal class.",
-          examples: const ["""
-enum Enum {}
-main() { Enum e; }"""]),
-
-      MessageKind.MISSING_ENUM_CASES:
-        const MessageTemplate(MessageKind.MISSING_ENUM_CASES,
-          "Missing enum constants in switch statement: #{enumValues}.",
-          howToFix: "Try adding the missing constants or a default case.",
-          examples: const ["""
-enum Enum { A, B }
-main() {
-  switch (Enum.A) {
-  case Enum.B: break;
-  }
-}""", """
-enum Enum { A, B, C }
-main() {
-  switch (Enum.A) {
-  case Enum.B: break;
-  }
-}"""]),
-
-      MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS:
-        const MessageTemplate(MessageKind.DUPLICATE_EXTENDS_IMPLEMENTS,
-          "'#{type}' can not be both extended and implemented."),
-
-      MessageKind.DUPLICATE_IMPLEMENTS:
-        const MessageTemplate(MessageKind.DUPLICATE_IMPLEMENTS,
-          "'#{type}' must not occur more than once "
-          "in the implements clause."),
-
-      MessageKind.MULTI_INHERITANCE:
-        const MessageTemplate(MessageKind.MULTI_INHERITANCE,
-          "Dart2js does not currently support inheritance of the same class "
-          "with different type arguments: Both #{firstType} and #{secondType} "
-          "are supertypes of #{thisType}."),
-
-      MessageKind.ILLEGAL_SUPER_SEND:
-        const MessageTemplate(MessageKind.ILLEGAL_SUPER_SEND,
-          "'#{name}' cannot be called on super."),
-
-      MessageKind.NO_SUCH_SUPER_MEMBER:
-        const MessageTemplate(MessageKind.NO_SUCH_SUPER_MEMBER,
-          "Cannot resolve '#{memberName}' in a superclass of '#{className}'."),
-
-      MessageKind.ADDITIONAL_TYPE_ARGUMENT:
-        const MessageTemplate(MessageKind.ADDITIONAL_TYPE_ARGUMENT,
-          "Additional type argument."),
-
-      MessageKind.MISSING_TYPE_ARGUMENT:
-        const MessageTemplate(MessageKind.MISSING_TYPE_ARGUMENT,
-          "Missing type argument."),
-
-      // TODO(johnniwinther): Use ADDITIONAL_TYPE_ARGUMENT or
-      // MISSING_TYPE_ARGUMENT instead.
-      MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH:
-        const MessageTemplate(MessageKind.TYPE_ARGUMENT_COUNT_MISMATCH,
-          "Incorrect number of type arguments on '#{type}'."),
-
-      MessageKind.GETTER_MISMATCH:
-        const MessageTemplate(MessageKind.GETTER_MISMATCH,
-          "Setter disagrees on: '#{modifiers}'."),
-
-      MessageKind.SETTER_MISMATCH:
-        const MessageTemplate(MessageKind.SETTER_MISMATCH,
-          "Getter disagrees on: '#{modifiers}'."),
-
-      MessageKind.ILLEGAL_SETTER_FORMALS:
-        const MessageTemplate(MessageKind.ILLEGAL_SETTER_FORMALS,
-          "A setter must have exactly one argument."),
-
-      MessageKind.NO_STATIC_OVERRIDE:
-        const MessageTemplate(MessageKind.NO_STATIC_OVERRIDE,
-          "Static member cannot override instance member '#{memberName}' of "
-          "'#{className}'."),
-
-      MessageKind.NO_STATIC_OVERRIDE_CONT:
-        const MessageTemplate(MessageKind.NO_STATIC_OVERRIDE_CONT,
-          "This is the instance member that cannot be overridden "
-          "by a static member."),
-
-      MessageKind.INSTANCE_STATIC_SAME_NAME:
-        const MessageTemplate(MessageKind.INSTANCE_STATIC_SAME_NAME,
-          "Instance member '#{memberName}' and static member of "
-          "superclass '#{className}' have the same name."),
-
-      MessageKind.INSTANCE_STATIC_SAME_NAME_CONT:
-        const MessageTemplate(MessageKind.INSTANCE_STATIC_SAME_NAME_CONT,
-          "This is the static member with the same name."),
-
-      MessageKind.INVALID_OVERRIDE_METHOD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_METHOD,
-          "The type '#{declaredType}' of method '#{name}' declared in "
-          "'#{class}' is not a subtype of the overridden method type "
-          "'#{inheritedType}' inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDDEN_METHOD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_METHOD,
-          "This is the overridden method '#{name}' declared in class "
-          "'#{class}'."),
-
-      MessageKind.INVALID_OVERRIDE_GETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_GETTER,
-          "The type '#{declaredType}' of getter '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden getter inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDDEN_GETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_GETTER,
-          "This is the overridden getter '#{name}' declared in class "
-          "'#{class}'."),
-
-      MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_GETTER_WITH_FIELD,
-          "The type '#{declaredType}' of field '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden getter inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD_WITH_GETTER,
-          "The type '#{declaredType}' of getter '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden field inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDE_SETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_SETTER,
-          "The type '#{declaredType}' of setter '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden setter inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDDEN_SETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_SETTER,
-          "This is the overridden setter '#{name}' declared in class "
-          "'#{class}'."),
-
-      MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_SETTER_WITH_FIELD,
-          "The type '#{declaredType}' of field '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden setter inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD_WITH_SETTER,
-          "The type '#{declaredType}' of setter '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden field inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDE_FIELD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDE_FIELD,
-          "The type '#{declaredType}' of field '#{name}' declared in "
-          "'#{class}' is not assignable to the type '#{inheritedType}' of the "
-          "overridden field inherited from '#{inheritedClass}'."),
-
-      MessageKind.INVALID_OVERRIDDEN_FIELD:
-        const MessageTemplate(MessageKind.INVALID_OVERRIDDEN_FIELD,
-          "This is the overridden field '#{name}' declared in class "
-          "'#{class}'."),
-
-      MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD:
-        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD,
-          "Method '#{name}' in '#{class}' can't override field from "
-          "'#{inheritedClass}'."),
-
-      MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT:
-        const MessageTemplate(
-          MessageKind.CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT,
-          "This is the field that cannot be overridden by a method."),
-
-      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD:
-        const MessageTemplate(
-          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD,
-          "Field '#{name}' in '#{class}' can't override method from "
-          "'#{inheritedClass}'."),
-
-      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT:
-        const MessageTemplate(
-          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT,
-          "This is the method that cannot be overridden by a field."),
-
-      MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD:
-        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD,
-              "Method '#{name}' in '#{class}' can't override getter from "
-              "'#{inheritedClass}'."),
-
-      MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT:
-        const MessageTemplate(
-          MessageKind.CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT,
-          "This is the getter that cannot be overridden by a method."),
-
-      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER:
-        const MessageTemplate(MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER,
-          "Getter '#{name}' in '#{class}' can't override method from "
-          "'#{inheritedClass}'."),
-
-      MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT:
-        const MessageTemplate(
-          MessageKind.CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT,
-          "This is the method that cannot be overridden by a getter."),
-
-      MessageKind.MISSING_FORMALS:
-        const MessageTemplate(MessageKind.MISSING_FORMALS,
-          "Formal parameters are missing."),
-
-      MessageKind.EXTRA_FORMALS:
-        const MessageTemplate(MessageKind.EXTRA_FORMALS,
-          "Formal parameters are not allowed here."),
-
-      MessageKind.UNARY_OPERATOR_BAD_ARITY:
-        const MessageTemplate(MessageKind.UNARY_OPERATOR_BAD_ARITY,
-          "Operator '#{operatorName}' must have no parameters."),
-
-      MessageKind.MINUS_OPERATOR_BAD_ARITY:
-        const MessageTemplate(MessageKind.MINUS_OPERATOR_BAD_ARITY,
-          "Operator '-' must have 0 or 1 parameters."),
-
-      MessageKind.BINARY_OPERATOR_BAD_ARITY:
-        const MessageTemplate(MessageKind.BINARY_OPERATOR_BAD_ARITY,
-          "Operator '#{operatorName}' must have exactly 1 parameter."),
-
-      MessageKind.TERNARY_OPERATOR_BAD_ARITY:
-        const MessageTemplate(MessageKind.TERNARY_OPERATOR_BAD_ARITY,
-          "Operator '#{operatorName}' must have exactly 2 parameters."),
-
-      MessageKind.OPERATOR_OPTIONAL_PARAMETERS:
-        const MessageTemplate(MessageKind.OPERATOR_OPTIONAL_PARAMETERS,
-          "Operator '#{operatorName}' cannot have optional parameters."),
-
-      MessageKind.OPERATOR_NAMED_PARAMETERS:
-        const MessageTemplate(MessageKind.OPERATOR_NAMED_PARAMETERS,
-          "Operator '#{operatorName}' cannot have named parameters."),
-
-      MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE:
-        const MessageTemplate(MessageKind.CONSTRUCTOR_WITH_RETURN_TYPE,
-          "Cannot have return type for constructor."),
-
-      MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.CANNOT_RETURN_FROM_CONSTRUCTOR,
-          "Constructors can't return values.",
-          howToFix: "Remove the return statement or use a factory constructor.",
-          examples: const ["""
-class C {
-  C() {
-    return 1;
-  }
-}
-
-main() => new C();"""]),
-
-      MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER:
-        const MessageTemplate(MessageKind.ILLEGAL_FINAL_METHOD_MODIFIER,
-          "Cannot have final modifier on method."),
-
-      MessageKind.ILLEGAL_CONST_FIELD_MODIFIER:
-        const MessageTemplate(MessageKind.ILLEGAL_CONST_FIELD_MODIFIER,
-          "Cannot have const modifier on non-static field.",
-          howToFix:
-            "Try adding a static modifier, or removing the const modifier.",
-          examples: const ["""
-class C {
-  const int a = 1;
-}
-
-main() => new C();"""]),
-
-      MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS:
-        const MessageTemplate(MessageKind.ILLEGAL_CONSTRUCTOR_MODIFIERS,
-          "Illegal constructor modifiers: '#{modifiers}'."),
-
-      MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_APPLICATION_MODIFIERS,
-              "Illegal mixin application modifiers: '#{modifiers}'."),
-
-      MessageKind.ILLEGAL_MIXIN_SUPERCLASS:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_SUPERCLASS,
-          "Class used as mixin must have Object as superclass."),
-
-      MessageKind.ILLEGAL_MIXIN_OBJECT:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_OBJECT,
-          "Cannot use Object as mixin."),
-
-      MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_CONSTRUCTOR,
-          "Class used as mixin cannot have non-factory constructor."),
-
-      MessageKind.ILLEGAL_MIXIN_CYCLE:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_CYCLE,
-          "Class used as mixin introduces mixin cycle: "
-          "'#{mixinName1}' <-> '#{mixinName2}'."),
-
-      MessageKind.ILLEGAL_MIXIN_WITH_SUPER:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_WITH_SUPER,
-          "Cannot use class '#{className}' as a mixin because it uses "
-          "'super'."),
-
-      MessageKind.ILLEGAL_MIXIN_SUPER_USE:
-        const MessageTemplate(MessageKind.ILLEGAL_MIXIN_SUPER_USE,
-          "Use of 'super' in class used as mixin."),
-
-      MessageKind.PARAMETER_NAME_EXPECTED:
-        const MessageTemplate(MessageKind.PARAMETER_NAME_EXPECTED,
-          "parameter name expected."),
-
-      MessageKind.CANNOT_RESOLVE_GETTER:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_GETTER,
-          "Cannot resolve getter."),
-
-      MessageKind.CANNOT_RESOLVE_SETTER:
-        const MessageTemplate(MessageKind.CANNOT_RESOLVE_SETTER,
-          "Cannot resolve setter."),
-
-      MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER:
-        const MessageTemplate(MessageKind.ASSIGNING_FINAL_FIELD_IN_SUPER,
-          "Cannot assign a value to final field '#{name}' "
-          "in superclass '#{superclassName}'."),
-
-      MessageKind.ASSIGNING_METHOD:
-        const MessageTemplate(MessageKind.ASSIGNING_METHOD,
-          "Cannot assign a value to a method."),
-
-      MessageKind.ASSIGNING_METHOD_IN_SUPER:
-        const MessageTemplate(MessageKind.ASSIGNING_METHOD_IN_SUPER,
-          "Cannot assign a value to method '#{name}' "
-          "in superclass '#{superclassName}'."),
-
-      MessageKind.ASSIGNING_TYPE:
-        const MessageTemplate(MessageKind.ASSIGNING_TYPE,
-          "Cannot assign a value to a type."),
-
-      MessageKind.IF_NULL_ASSIGNING_TYPE:
-        const MessageTemplate(MessageKind.IF_NULL_ASSIGNING_TYPE,
-          "Cannot assign a value to a type. Note that types are never null, "
-          "so this ??= assignment has no effect.",
-          howToFix: "Try removing the '??=' assignment.",
-          examples: const [
-              "class A {} main() { print(A ??= 3);}",
-          ]),
-
-      MessageKind.VOID_NOT_ALLOWED:
-        const MessageTemplate(MessageKind.VOID_NOT_ALLOWED,
-          "Type 'void' can't be used here because it isn't a return type.",
-          howToFix:
-            "Try removing 'void' keyword or replace it with 'var', 'final', "
-            "or a type.",
-          examples: const [
-              "void x; main() {}",
-              "foo(void x) {} main() { foo(null); }",
-          ]),
-
-      MessageKind.NULL_NOT_ALLOWED:
-        const MessageTemplate(MessageKind.NULL_NOT_ALLOWED,
-          "`null` can't be used here."),
-
-      MessageKind.BEFORE_TOP_LEVEL:
-        const MessageTemplate(MessageKind.BEFORE_TOP_LEVEL,
-          "Part header must come before top-level definitions."),
-
-      MessageKind.IMPORT_PART_OF:
-        const MessageTemplate(MessageKind.IMPORT_PART_OF,
-          "The imported library must not have a 'part-of' directive.",
-          howToFix: "Try removing the 'part-of' directive or replacing the "
-                    "import of the library with a 'part' directive.",
-          examples: const [const {
-'main.dart': """
-library library;
-
-import 'part.dart';
-
-main() {}
-""",
-
-'part.dart': """
-part of library;
-"""}]),
-
-      MessageKind.LIBRARY_NAME_MISMATCH:
-        const MessageTemplate(MessageKind.LIBRARY_NAME_MISMATCH,
-          "Expected part of library name '#{libraryName}'.",
-          howToFix: "Try changing the directive to 'part of #{libraryName};'.",
-          examples: const [const {
-'main.dart': """
-library lib.foo;
-
-part 'part.dart';
-
-main() {}
-""",
-
-'part.dart': """
-part of lib.bar;
-"""}]),
-
-      MessageKind.MISSING_LIBRARY_NAME:
-        const MessageTemplate(MessageKind.MISSING_LIBRARY_NAME,
-          "Library has no name. Part directive expected library name "
-          "to be '#{libraryName}'.",
-          howToFix: "Try adding 'library #{libraryName};' to the library.",
-          examples: const [const {
-'main.dart': """
-part 'part.dart';
-
-main() {}
-""",
-
-'part.dart': """
-part of lib.foo;
-"""}]),
-
-      MessageKind.THIS_IS_THE_PART_OF_TAG:
-        const MessageTemplate(MessageKind.THIS_IS_THE_PART_OF_TAG,
-          "This is the part of directive."),
-
-      MessageKind.MISSING_PART_OF_TAG:
-        const MessageTemplate(MessageKind.MISSING_PART_OF_TAG,
-          "This file has no part-of tag, but it is being used as a part."),
-
-      MessageKind.DUPLICATED_PART_OF:
-        const MessageTemplate(MessageKind.DUPLICATED_PART_OF,
-          "Duplicated part-of directive."),
-
-      MessageKind.DUPLICATED_LIBRARY_NAME:
-        const MessageTemplate(MessageKind.DUPLICATED_LIBRARY_NAME,
-          "Duplicated library name '#{libraryName}'."),
-
-      MessageKind.DUPLICATED_RESOURCE:
-        const MessageTemplate(MessageKind.DUPLICATED_RESOURCE,
-          "The resource '#{resourceUri}' is loaded through both "
-          "'#{canonicalUri1}' and '#{canonicalUri2}'."),
-
-      MessageKind.DUPLICATED_LIBRARY_RESOURCE:
-        const MessageTemplate(MessageKind.DUPLICATED_LIBRARY_RESOURCE,
-          "The library '#{libraryName}' in '#{resourceUri}' is loaded through "
-          "both '#{canonicalUri1}' and '#{canonicalUri2}'."),
-
-      // This is used as an exception.
-      MessageKind.INVALID_SOURCE_FILE_LOCATION:
-        const MessageTemplate(MessageKind.INVALID_SOURCE_FILE_LOCATION, '''
-Invalid offset (#{offset}) in source map.
-File: #{fileName}
-Length: #{length}'''),
-
-      MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC:
-        const MessageTemplate(MessageKind.TOP_LEVEL_VARIABLE_DECLARED_STATIC,
-              "Top-level variable cannot be declared static."),
-
-      MessageKind.REFERENCE_IN_INITIALIZATION:
-        const MessageTemplate(MessageKind.REFERENCE_IN_INITIALIZATION,
-           "Variable '#{variableName}' is referenced during its "
-           "initialization.",
-           howToFix:
-             "If you are trying to reference a shadowed variable, rename "
-             "one of the variables.",
-           examples: const ["""
-foo(t) {
-  var t = t;
-  return t;
-}
-
-main() => foo(1);
-"""]),
-
-      MessageKind.CONST_WITHOUT_INITIALIZER:
-        const MessageTemplate(MessageKind.CONST_WITHOUT_INITIALIZER,
-          "A constant variable must be initialized.",
-          howToFix: "Try adding an initializer or "
-                    "removing the 'const' modifier.",
-          examples: const ["""
-void main() {
-  const c; // This constant variable must be initialized.
-}"""]),
-
-      MessageKind.FINAL_WITHOUT_INITIALIZER:
-        const MessageTemplate(MessageKind.FINAL_WITHOUT_INITIALIZER,
-          "A final variable must be initialized.",
-          howToFix: "Try adding an initializer or "
-                    "removing the 'final' modifier.",
-          examples: const [
-              "class C { static final field; } main() => C.field;"]),
-
-      MessageKind.MEMBER_USES_CLASS_NAME:
-        const MessageTemplate(MessageKind.MEMBER_USES_CLASS_NAME,
-          "Member variable can't have the same name as the class it is "
-          "declared in.",
-          howToFix: "Try renaming the variable.",
-          examples: const ["""
-class A { var A; }
-main() {
-  var a = new A();
-  a.A = 1;
-}
-""", """
-class A { static var A; }
-main() => A.A = 1;
-"""]),
-
-      MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT:
-        const MessageTemplate(
-          MessageKind.WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT,
-          "Wrong number of arguments to assert. Should be 1, but given "
-          "#{argumentCount}."),
-
-      MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS:
-        const MessageTemplate(MessageKind.ASSERT_IS_GIVEN_NAMED_ARGUMENTS,
-          "'assert' takes no named arguments, but given #{argumentCount}."),
-
-      MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY:
-        const MessageTemplate(MessageKind.FACTORY_REDIRECTION_IN_NON_FACTORY,
-          "Factory redirection only allowed in factories."),
-
-      MessageKind.MISSING_FACTORY_KEYWORD:
-        const MessageTemplate(MessageKind.MISSING_FACTORY_KEYWORD,
-          "Did you forget a factory keyword here?"),
-
-      MessageKind.NO_SUCH_METHOD_IN_NATIVE:
-        const MessageTemplate(MessageKind.NO_SUCH_METHOD_IN_NATIVE,
-          "'NoSuchMethod' is not supported for classes that extend native "
-          "classes."),
-
-      MessageKind.DEFERRED_LIBRARY_DART_2_DART:
-        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_DART_2_DART,
-          "Deferred loading is not supported by the dart backend yet. "
-          "The output will not be split."),
-
-      MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX:
-        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_WITHOUT_PREFIX,
-          "This import is deferred but there is no prefix keyword.",
-          howToFix: "Try adding a prefix to the import."),
-
-      MessageKind.DEFERRED_OLD_SYNTAX:
-        const MessageTemplate(MessageKind.DEFERRED_OLD_SYNTAX,
-          "The DeferredLibrary annotation is obsolete.",
-          howToFix:
-            "Use the \"import 'lib.dart' deferred as prefix\" syntax instead."),
-
-      MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX:
-        const MessageTemplate(MessageKind.DEFERRED_LIBRARY_DUPLICATE_PREFIX,
-          "The prefix of this deferred import is not unique.",
-          howToFix: "Try changing the import prefix."),
-
-      MessageKind.DEFERRED_TYPE_ANNOTATION:
-        const MessageTemplate(MessageKind.DEFERRED_TYPE_ANNOTATION,
-          "The type #{node} is deferred. "
-          "Deferred types are not valid as type annotations.",
-          howToFix:
-            "Try using a non-deferred abstract class as an interface."),
-
-      MessageKind.ILLEGAL_STATIC:
-        const MessageTemplate(MessageKind.ILLEGAL_STATIC,
-          "Modifier static is only allowed on functions declared in "
-          "a class."),
-
-      MessageKind.STATIC_FUNCTION_BLOAT:
-        const MessageTemplate(MessageKind.STATIC_FUNCTION_BLOAT,
-          "Using '#{class}.#{name}' may lead to unnecessarily large "
-          "generated code.",
-          howToFix:
-              "Try adding '@MirrorsUsed(...)' as described at "
-              "https://goo.gl/Akrrog."),
-
-      MessageKind.NON_CONST_BLOAT:
-        const MessageTemplate(MessageKind.NON_CONST_BLOAT,
-          "Using 'new #{name}' may lead to unnecessarily large generated "
-          "code.",
-          howToFix:
-              "Try using 'const #{name}' or adding '@MirrorsUsed(...)' as "
-              "described at https://goo.gl/Akrrog."),
-
-      MessageKind.STRING_EXPECTED:
-        const MessageTemplate(MessageKind.STRING_EXPECTED,
-          "Expected a 'String', but got an instance of '#{type}'."),
-
-      MessageKind.PRIVATE_IDENTIFIER:
-        const MessageTemplate(MessageKind.PRIVATE_IDENTIFIER,
-          "'#{value}' is not a valid Symbol name because it starts with "
-          "'_'."),
-
-      MessageKind.PRIVATE_NAMED_PARAMETER:
-        const MessageTemplate(MessageKind.PRIVATE_NAMED_PARAMETER,
-          "Named optional parameter can't have a library private name.",
-          howToFix:
-            "Try removing the '_' or making the parameter positional or "
-            "required.",
-          examples: const ["""foo({int _p}) {} main() => foo();"""]),
-
-      MessageKind.UNSUPPORTED_LITERAL_SYMBOL:
-        const MessageTemplate(MessageKind.UNSUPPORTED_LITERAL_SYMBOL,
-          "Symbol literal '##{value}' is currently unsupported by dart2js."),
-
-      MessageKind.INVALID_SYMBOL:
-        const MessageTemplate(MessageKind.INVALID_SYMBOL, '''
-'#{value}' is not a valid Symbol name because is not:
- * an empty String,
- * a user defined operator,
- * a qualified non-private identifier optionally followed by '=', or
- * a qualified non-private identifier followed by '.' and a user-defined '''
-"operator."),
-
-      MessageKind.AMBIGUOUS_REEXPORT:
-        const MessageTemplate(MessageKind.AMBIGUOUS_REEXPORT,
-          "'#{name}' is (re)exported by multiple libraries."),
-
-      MessageKind.AMBIGUOUS_LOCATION:
-        const MessageTemplate(MessageKind.AMBIGUOUS_LOCATION,
-          "'#{name}' is defined here."),
-
-      MessageKind.IMPORTED_HERE:
-        const MessageTemplate(MessageKind.IMPORTED_HERE,
-          "'#{name}' is imported here."),
-
-      MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE:
-        const MessageTemplate(MessageKind.OVERRIDE_EQUALS_NOT_HASH_CODE,
-          "The class '#{class}' overrides 'operator==', "
-          "but not 'get hashCode'."),
-
-      MessageKind.INTERNAL_LIBRARY_FROM:
-        const MessageTemplate(MessageKind.INTERNAL_LIBRARY_FROM,
-          "Internal library '#{resolvedUri}' is not accessible from "
-          "'#{importingUri}'."),
-
-      MessageKind.INTERNAL_LIBRARY:
-        const MessageTemplate(MessageKind.INTERNAL_LIBRARY,
-          "Internal library '#{resolvedUri}' is not accessible."),
-
-      MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS:
-        const MessageTemplate(
-          MessageKind.JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS,
-          "Js-interop class '#{cls}' cannot extend from the non js-interop "
-          "class '#{superclass}'.",
-          howToFix: "Annotate the superclass with @JS.",
-          examples: const [
-              """
-              import 'package:js/js.dart';
-
-              class Foo { }
-
-              @JS()
-              class Bar extends Foo { }
-
-              main() {
-                new Bar();
-              }
-              """]),
-
-      MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER:
-        const MessageTemplate(
-          MessageKind.JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER,
-          "Member '#{member}' in js-interop class '#{cls}' is not external.",
-          howToFix: "Mark all interop methods external",
-          examples: const [
-              """
-              import 'package:js/js.dart';
-
-              @JS()
-              class Foo {
-                bar() {}
-              }
-
-              main() {
-                new Foo().bar();
-              }
-              """]),
-
-      MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS:
-        const MessageTemplate(
-          MessageKind.JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS,
-          "Js-interop method '#{method}' has named arguments but is not "
-          "a factory constructor of an @anonymous @JS class.",
-          howToFix: "Remove all named arguments from js-interop method or "
-                    "in the case of a factory constructor annotate the class "
-                    "as @anonymous.",
-          examples: const [
-              """
-              import 'package:js/js.dart';
-
-              @JS()
-              class Foo {
-                external bar(foo, {baz});
-              }
-
-              main() {
-                new Foo().bar(4, baz: 5);
-              }
-              """]),
-
-      MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS:
-        const MessageTemplate(
-          MessageKind.JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS,
-          "Parameter '#{parameter}' in anonymous js-interop class '#{cls}' "
-          "object literal constructor is positional instead of named."
-          ".",
-          howToFix: "Make all arguments in external factory object literal "
-                    "constructors named.",
-          examples: const [
-              """
-              import 'package:js/js.dart';
-
-              @anonymous
-              @JS()
-              class Foo {
-                external factory Foo(foo, {baz});
-              }
-
-              main() {
-                new Foo(5, baz: 5);
-              }
-              """]),
-
-      MessageKind.LIBRARY_NOT_FOUND:
-        const MessageTemplate(MessageKind.LIBRARY_NOT_FOUND,
-          "Library not found '#{resolvedUri}'."),
-
-      MessageKind.LIBRARY_NOT_SUPPORTED:
-        const MessageTemplate(MessageKind.LIBRARY_NOT_SUPPORTED,
-          "Library not supported '#{resolvedUri}'.",
-          howToFix: "Try removing the dependency or enabling support using "
-                    "the '--categories' option.",
-          examples: const [/*
-              """
-              import 'dart:io';
-              main() {}
-              """
-          */]),
-          // TODO(johnniwinther): Enable example when message_kind_test.dart
-          // supports library loader callbacks.
-
-      MessageKind.UNSUPPORTED_EQ_EQ_EQ:
-        const MessageTemplate(MessageKind.UNSUPPORTED_EQ_EQ_EQ,
-          "'===' is not an operator. "
-          "Did you mean '#{lhs} == #{rhs}' or 'identical(#{lhs}, #{rhs})'?"),
-
-      MessageKind.UNSUPPORTED_BANG_EQ_EQ:
-        const MessageTemplate(MessageKind.UNSUPPORTED_BANG_EQ_EQ,
-          "'!==' is not an operator. "
-          "Did you mean '#{lhs} != #{rhs}' or '!identical(#{lhs}, #{rhs})'?"),
-
-      MessageKind.UNSUPPORTED_PREFIX_PLUS:
-        const MessageTemplate(MessageKind.UNSUPPORTED_PREFIX_PLUS,
-          "'+' is not a prefix operator. ",
-          howToFix: "Try removing '+'.",
-          examples: const [
-              "main() => +2;  // No longer a valid way to write '2'"
-          ]),
-
-      MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP:
-        const MessageTemplate(MessageKind.UNSUPPORTED_THROW_WITHOUT_EXP,
-          "No expression after 'throw'. "
-          "Did you mean 'rethrow'?"),
-
-      MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX:
-        const MessageTemplate(MessageKind.DEPRECATED_TYPEDEF_MIXIN_SYNTAX,
-          "'typedef' not allowed here. ",
-          howToFix: "Try replacing 'typedef' with 'class'.",
-          examples: const [
-              """
-class B { }
-class M1 {  }
-typedef C = B with M1;  // Need to replace 'typedef' with 'class'.
-main() { new C(); }
-"""]),
-
-      MessageKind.MIRRORS_EXPECTED_STRING:
-        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING,
-          "Can't use '#{name}' here because it's an instance of '#{type}' "
-          "and a 'String' value is expected.",
-          howToFix: "Did you forget to add quotes?",
-          examples: const [
-              """
-// 'Foo' is a type literal, not a string.
-@MirrorsUsed(symbols: const [Foo])
-import 'dart:mirrors';
-
-class Foo {}
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE:
-        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_OR_TYPE,
-          "Can't use '#{name}' here because it's an instance of '#{type}' "
-          "and a 'String' or 'Type' value is expected.",
-          howToFix: "Did you forget to add quotes?",
-          examples: const [
-              """
-// 'main' is a method, not a class.
-@MirrorsUsed(targets: const [main])
-import 'dart:mirrors';
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST:
-        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_OR_LIST,
-          "Can't use '#{name}' here because it's an instance of '#{type}' "
-          "and a 'String' or 'List' value is expected.",
-          howToFix: "Did you forget to add quotes?",
-          examples: const [
-              """
-// 'Foo' is not a string.
-@MirrorsUsed(symbols: Foo)
-import 'dart:mirrors';
-
-class Foo {}
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST:
-        const MessageTemplate(MessageKind.MIRRORS_EXPECTED_STRING_TYPE_OR_LIST,
-          "Can't use '#{name}' here because it's an instance of '#{type}' "
-          "but a 'String', 'Type', or 'List' value is expected.",
-          howToFix: "Did you forget to add quotes?",
-          examples: const [
-              """
-// '1' is not a string.
-@MirrorsUsed(targets: 1)
-import 'dart:mirrors';
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY:
-        const MessageTemplate(
-          MessageKind.MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY,
-          "Can't find '#{name}' in the current library.",
-          // TODO(ahe): The closest identifiers in edit distance would be nice.
-          howToFix: "Did you forget to add an import?",
-          examples: const [
-              """
-// 'window' is not in scope because dart:html isn't imported.
-@MirrorsUsed(targets: 'window')
-import 'dart:mirrors';
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY:
-        const MessageTemplate(MessageKind.MIRRORS_CANNOT_RESOLVE_IN_LIBRARY,
-          "Can't find '#{name}' in the library '#{library}'.",
-          // TODO(ahe): The closest identifiers in edit distance would be nice.
-          howToFix: "Is '#{name}' spelled right?",
-          examples: const [
-              """
-// 'List' is misspelled.
-@MirrorsUsed(targets: 'dart.core.Lsit')
-import 'dart:mirrors';
-
-main() {}
-"""]),
-
-      MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT:
-        const MessageTemplate(MessageKind.MIRRORS_CANNOT_FIND_IN_ELEMENT,
-          "Can't find '#{name}' in '#{element}'.",
-          // TODO(ahe): The closest identifiers in edit distance would be nice.
-          howToFix: "Is '#{name}' spelled right?",
-          examples: const [
-              """
-// 'addAll' is misspelled.
-@MirrorsUsed(targets: 'dart.core.List.addAl')
-import 'dart:mirrors';
-
-main() {}
-"""]),
-
-      MessageKind.INVALID_URI:
-        const MessageTemplate(MessageKind.INVALID_URI,
-          "'#{uri}' is not a valid URI.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [
-            """
-// can't have a '[' in a URI
-import '../../Udyn[mic ils/expect.dart';
-
-main() {}
-"""]),
-
-      MessageKind.INVALID_PACKAGE_CONFIG:
-          const MessageTemplate(MessageKind.INVALID_PACKAGE_CONFIG,
-            """Package config file '#{uri}' is invalid.
-#{exception}""",
-            howToFix: DONT_KNOW_HOW_TO_FIX
-      ),
-
-      MessageKind.INVALID_PACKAGE_URI:
-        const MessageTemplate(MessageKind.INVALID_PACKAGE_URI,
-          "'#{uri}' is not a valid package URI (#{exception}).",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [
-            """
-// can't have a 'top level' package URI
-import 'package:foo.dart';
-
-main() {}
-""", """
-// can't have 2 slashes
-import 'package://foo/foo.dart';
-
-main() {}
-""", """
-// package name must be valid
-import 'package:not\valid/foo.dart';
-
-main() {}
-"""]),
-
-      MessageKind.READ_SCRIPT_ERROR:
-        const MessageTemplate(MessageKind.READ_SCRIPT_ERROR,
-          "Can't read '#{uri}' (#{exception}).",
-          // Don't know how to fix since the underlying error is unknown.
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [
-              """
-// 'foo.dart' does not exist.
-import 'foo.dart';
-
-main() {}
-"""]),
-
-      MessageKind.READ_SELF_ERROR:
-        const MessageTemplate(MessageKind.READ_SELF_ERROR,
-          "#{exception}",
-          // Don't know how to fix since the underlying error is unknown.
-          howToFix: DONT_KNOW_HOW_TO_FIX),
-
-      MessageKind.EXTRANEOUS_MODIFIER:
-        const MessageTemplate(MessageKind.EXTRANEOUS_MODIFIER,
-          "Can't have modifier '#{modifier}' here.",
-          howToFix: "Try removing '#{modifier}'.",
-          examples: const [
-              "var String foo; main(){}",
-              // "var get foo; main(){}",
-              "var set foo; main(){}",
-              "var final foo; main(){}",
-              "var var foo; main(){}",
-              "var const foo; main(){}",
-              "var abstract foo; main(){}",
-              "var static foo; main(){}",
-              "var external foo; main(){}",
-              "get var foo; main(){}",
-              "set var foo; main(){}",
-              "final var foo; main(){}",
-              "var var foo; main(){}",
-              "const var foo; main(){}",
-              "abstract var foo; main(){}",
-              "static var foo; main(){}",
-              "external var foo; main(){}"]),
-
-      MessageKind.EXTRANEOUS_MODIFIER_REPLACE:
-        const MessageTemplate(MessageKind.EXTRANEOUS_MODIFIER_REPLACE,
-          "Can't have modifier '#{modifier}' here.",
-          howToFix:
-            "Try replacing modifier '#{modifier}' with 'var', 'final', "
-            "or a type.",
-          examples: const [
-              // "get foo; main(){}",
-              "set foo; main(){}",
-              "abstract foo; main(){}",
-              "static foo; main(){}",
-              "external foo; main(){}"]),
-
-      MessageKind.ABSTRACT_CLASS_INSTANTIATION:
-        const MessageTemplate(MessageKind.ABSTRACT_CLASS_INSTANTIATION,
-          "Can't instantiate abstract class.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const ["abstract class A {} main() { new A(); }"]),
-
-      MessageKind.BODY_EXPECTED:
-        const MessageTemplate(MessageKind.BODY_EXPECTED,
-          "Expected a function body or '=>'.",
-          // TODO(ahe): In some scenarios, we can suggest removing the 'static'
-          // keyword.
-          howToFix: "Try adding {}.",
-          examples: const [
-              "main();"]),
-
-      MessageKind.MIRROR_BLOAT:
-        const MessageTemplate(MessageKind.MIRROR_BLOAT,
-          "#{count} methods retained for use by dart:mirrors out of #{total}"
-          " total methods (#{percentage}%)."),
-
-      MessageKind.MIRROR_IMPORT:
-        const MessageTemplate(MessageKind.MIRROR_IMPORT,
-          "Import of 'dart:mirrors'."),
-
-      MessageKind.MIRROR_IMPORT_NO_USAGE:
-        const MessageTemplate(MessageKind.MIRROR_IMPORT_NO_USAGE,
-          "This import is not annotated with @MirrorsUsed, which may lead to "
-          "unnecessarily large generated code.",
-          howToFix:
-              "Try adding '@MirrorsUsed(...)' as described at "
-              "https://goo.gl/Akrrog."),
-
-      MessageKind.JS_PLACEHOLDER_CAPTURE:
-        const MessageTemplate(
-            MessageKind.JS_PLACEHOLDER_CAPTURE,
-            "JS code must not use '#' placeholders inside functions.",
-            howToFix:
-            "Use an immediately called JavaScript function to capture the"
-            " the placeholder values as JavaScript function parameters."),
-
-      MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT:
-        const MessageTemplate(
-          MessageKind.WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT,
-          "Argument for 'JS_INTERCEPTOR_CONSTANT' must be a type constant."),
-
-      MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD:
-        const MessageTemplate(MessageKind.EXPECTED_IDENTIFIER_NOT_RESERVED_WORD,
-              "'#{keyword}' is a reserved word and can't be used here.",
-              howToFix: "Try using a different name.",
-              examples: const ["do() {} main() {}"]),
-
-      MessageKind. NAMED_FUNCTION_EXPRESSION:
-        const MessageTemplate(MessageKind.NAMED_FUNCTION_EXPRESSION,
-          "Function expression '#{name}' cannot be named.",
-          howToFix: "Try removing the name.",
-          examples: const ["main() { var f = func() {}; }"]),
-
-      MessageKind.UNUSED_METHOD:
-        const MessageTemplate(MessageKind.UNUSED_METHOD,
-          "The method '#{name}' is never called.",
-          howToFix: "Consider deleting it.",
-          examples: const ["deadCode() {} main() {}"]),
-
-      MessageKind.UNUSED_CLASS:
-        const MessageTemplate(MessageKind.UNUSED_CLASS,
-          "The class '#{name}' is never used.",
-          howToFix: "Consider deleting it.",
-          examples: const ["class DeadCode {} main() {}"]),
-
-      MessageKind.UNUSED_TYPEDEF:
-        const MessageTemplate(MessageKind.UNUSED_TYPEDEF,
-          "The typedef '#{name}' is never used.",
-          howToFix: "Consider deleting it.",
-          examples: const ["typedef DeadCode(); main() {}"]),
-
-      MessageKind.ABSTRACT_METHOD:
-        const MessageTemplate(MessageKind.ABSTRACT_METHOD,
-          "The method '#{name}' has no implementation in "
-          "class '#{class}'.",
-          howToFix: "Try adding a body to '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-class Class {
-  method();
-}
-main() => new Class().method();
-"""]),
-
-      MessageKind.ABSTRACT_GETTER:
-        const MessageTemplate(MessageKind.ABSTRACT_GETTER,
-          "The getter '#{name}' has no implementation in "
-          "class '#{class}'.",
-          howToFix: "Try adding a body to '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-class Class {
-  get getter;
-}
-main() => new Class();
-"""]),
-
-      MessageKind.ABSTRACT_SETTER:
-        const MessageTemplate(MessageKind.ABSTRACT_SETTER,
-          "The setter '#{name}' has no implementation in "
-          "class '#{class}'.",
-          howToFix: "Try adding a body to '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-class Class {
-  set setter(_);
-}
-main() => new Class();
-"""]),
-
-      MessageKind.INHERIT_GETTER_AND_METHOD:
-        const MessageTemplate(MessageKind.INHERIT_GETTER_AND_METHOD,
-          "The class '#{class}' can't inherit both getters and methods "
-          "by the named '#{name}'.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const ["""
-class A {
-  get member => null;
-}
-class B {
-  member() {}
-}
-class Class implements A, B {
-}
-main() => new Class();
-"""]),
-
-      MessageKind.INHERITED_METHOD:
-        const MessageTemplate(MessageKind.INHERITED_METHOD,
-          "The inherited method '#{name}' is declared here in class "
-          "'#{class}'."),
-
-      MessageKind.INHERITED_EXPLICIT_GETTER:
-        const MessageTemplate(MessageKind.INHERITED_EXPLICIT_GETTER,
-          "The inherited getter '#{name}' is declared here in class "
-          "'#{class}'."),
-
-      MessageKind.INHERITED_IMPLICIT_GETTER:
-        const MessageTemplate(MessageKind.INHERITED_IMPLICIT_GETTER,
-          "The inherited getter '#{name}' is implicitly declared by this "
-          "field in class '#{class}'."),
-
-      MessageKind.UNIMPLEMENTED_METHOD_ONE:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD_ONE,
-          "'#{class}' doesn't implement '#{method}' "
-          "declared in '#{declarer}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  m();
-}
-class C implements I {}
-main() => new C();
-""", """
-abstract class I {
-  m();
-}
-class C extends I {}
-main() => new C();
-"""]),
-
-      MessageKind.UNIMPLEMENTED_METHOD:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD,
-          "'#{class}' doesn't implement '#{method}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  m();
-}
-
-abstract class J {
-  m();
-}
-
-class C implements I, J {}
-
-main() {
- new C();
-}
-""", """
-abstract class I {
-  m();
-}
-
-abstract class J {
-  m();
-}
-
-class C extends I implements J {}
-
-main() {
- new C();
-}
-"""]),
-
-      MessageKind.UNIMPLEMENTED_METHOD_CONT:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_METHOD_CONT,
-          "The method '#{name}' is declared here in class '#{class}'."),
-
-      MessageKind.UNIMPLEMENTED_SETTER_ONE:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_SETTER_ONE,
-          "'#{class}' doesn't implement the setter '#{name}' "
-          "declared in '#{declarer}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  set m(_);
-}
-class C implements I {}
-class D implements I {
-  set m(_) {}
-}
-main() {
- new D().m = 0;
- new C();
-}
-"""]),
-
-      MessageKind.UNIMPLEMENTED_SETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_SETTER,
-          "'#{class}' doesn't implement the setter '#{name}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  set m(_);
-}
-abstract class J {
-  set m(_);
-}
-class C implements I, J {}
-main() => new C();
-""", """
-abstract class I {
-  set m(_);
-}
-abstract class J {
-  set m(_);
-}
-class C extends I implements J {}
-main() => new C();
-"""]),
-
-      MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_EXPLICIT_SETTER,
-          "The setter '#{name}' is declared here in class '#{class}'."),
-
-      MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_IMPLICIT_SETTER,
-          "The setter '#{name}' is implicitly declared by this field "
-          "in class '#{class}'."),
-
-      MessageKind.UNIMPLEMENTED_GETTER_ONE:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_GETTER_ONE,
-          "'#{class}' doesn't implement the getter '#{name}' "
-          "declared in '#{declarer}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  get m;
-}
-class C implements I {}
-main() => new C();
-""", """
-abstract class I {
-  get m;
-}
-class C extends I {}
-main() => new C();
-"""]),
-
-      MessageKind.UNIMPLEMENTED_GETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_GETTER,
-          "'#{class}' doesn't implement the getter '#{name}'.",
-          howToFix: "Try adding an implementation of '#{name}' or declaring "
-                    "'#{class}' to be 'abstract'.",
-          examples: const ["""
-abstract class I {
-  get m;
-}
-abstract class J {
-  get m;
-}
-class C implements I, J {}
-main() => new C();
-""", """
-abstract class I {
-  get m;
-}
-abstract class J {
-  get m;
-}
-class C extends I implements J {}
-main() => new C();
-"""]),
-
-      MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_EXPLICIT_GETTER,
-          "The getter '#{name}' is declared here in class '#{class}'."),
-
-      MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER:
-        const MessageTemplate(MessageKind.UNIMPLEMENTED_IMPLICIT_GETTER,
-          "The getter '#{name}' is implicitly declared by this field "
-          "in class '#{class}'."),
-
-      MessageKind.EQUAL_MAP_ENTRY_KEY:
-        const MessageTemplate(MessageKind.EQUAL_MAP_ENTRY_KEY,
-          "An entry with the same key already exists in the map.",
-          howToFix:
-            "Try removing the previous entry or changing the key in one "
-            "of the entries.",
-          examples: const ["""
-main() {
-  var m = const {'foo': 1, 'foo': 2};
-}"""]),
-
-      MessageKind.BAD_INPUT_CHARACTER:
-        const MessageTemplate(MessageKind.BAD_INPUT_CHARACTER,
-          "Character U+#{characterHex} isn't allowed here.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const ["""
-main() {
-  String x = ç;
-}
-"""]),
-
-      MessageKind.UNTERMINATED_STRING:
-        const MessageTemplate(MessageKind.UNTERMINATED_STRING,
-          "String must end with #{quote}.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const ["""
-main() {
-  return '
-;
-}
-""",
-"""
-main() {
-  return \"
-;
-}
-""",
-"""
-main() {
-  return r'
-;
-}
-""",
-"""
-main() {
-  return r\"
-;
-}
-""",
-"""
-main() => '''
-""",
-"""
-main() => \"\"\"
-""",
-"""
-main() => r'''
-""",
-"""
-main() => r\"\"\"
-"""]),
-
-      MessageKind.UNMATCHED_TOKEN:
-        const MessageTemplate(MessageKind.UNMATCHED_TOKEN,
-          "Can't find '#{end}' to match '#{begin}'.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const[
-              "main(",
-              "main(){",
-              "main(){]}",
-            ]),
-
-      MessageKind.UNTERMINATED_TOKEN:
-        const MessageTemplate(MessageKind.UNTERMINATED_TOKEN,
-          // This is a fall-back message that shouldn't happen.
-          "Incomplete token."),
-
-      MessageKind.EXPONENT_MISSING:
-        const MessageTemplate(MessageKind.EXPONENT_MISSING,
-          "Numbers in exponential notation should always contain an exponent"
-          " (an integer number with an optional sign).",
-          howToFix:
-            "Make sure there is an exponent, and remove any whitespace "
-            "before it.",
-          examples: const ["""
-main() {
-  var i = 1e;
-}
-"""]),
-
-      MessageKind.HEX_DIGIT_EXPECTED:
-        const MessageTemplate(MessageKind.HEX_DIGIT_EXPECTED,
-          "A hex digit (0-9 or A-F) must follow '0x'.",
-          howToFix:
-            DONT_KNOW_HOW_TO_FIX, // Seems obvious from the error message.
-          examples: const ["""
-main() {
-  var i = 0x;
-}
-"""]),
-
-      MessageKind.MALFORMED_STRING_LITERAL:
-        const MessageTemplate(MessageKind.MALFORMED_STRING_LITERAL,
-          r"A '$' has special meaning inside a string, and must be followed by "
-          "an identifier or an expression in curly braces ({}).",
-          howToFix: r"Try adding a backslash (\) to escape the '$'.",
-          examples: const [r"""
-main() {
-  return '$';
-}
-""",
-r'''
-main() {
-  return "$";
-}
-''',
-r"""
-main() {
-  return '''$''';
-}
-""",
-r'''
-main() {
-  return """$""";
-}
-''']),
-
-      MessageKind.UNTERMINATED_COMMENT:
-        const MessageTemplate(MessageKind.UNTERMINATED_COMMENT,
-          "Comment starting with '/*' must end with '*/'.",
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [r"""
-main() {
-}
-/*"""]),
-
-      MessageKind.MISSING_TOKEN_BEFORE_THIS:
-        const MessageTemplate(MessageKind.MISSING_TOKEN_BEFORE_THIS,
-          "Expected '#{token}' before this.",
-          // Consider the second example below: the parser expects a ')' before
-          // 'y', but a ',' would also have worked. We don't have enough
-          // information to give a good suggestion.
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [
-              "main() => true ? 1;",
-              "main() => foo(x: 1 y: 2);",
-            ]),
-
-      MessageKind.MISSING_TOKEN_AFTER_THIS:
-        const MessageTemplate(MessageKind.MISSING_TOKEN_AFTER_THIS,
-          "Expected '#{token}' after this.",
-          // See [MISSING_TOKEN_BEFORE_THIS], we don't have enough information
-          // to give a good suggestion.
-          howToFix: DONT_KNOW_HOW_TO_FIX,
-          examples: const [
-              "main(x) {x}",
-"""
-class S1 {}
-class S2 {}
-class S3 {}
-class A = S1 with S2, S3
-main() => new A();
-"""
-]),
-
-      MessageKind.CONSIDER_ANALYZE_ALL:
-        const MessageTemplate(MessageKind.CONSIDER_ANALYZE_ALL,
-          "Could not find '#{main}'.  Nothing will be analyzed.",
-          howToFix: "Try using '--analyze-all' to analyze everything.",
-          examples: const ['']),
-
-      MessageKind.MISSING_MAIN:
-        const MessageTemplate(MessageKind.MISSING_MAIN,
-          "Could not find '#{main}'.",
-          howToFix: "Try adding a method named '#{main}' to your program."
-          /* No example, test uses '--analyze-only' which will produce the above
-           * message [CONSIDER_ANALYZE_ALL].  An example for a human operator
-           * would be an empty file.*/),
-
-      MessageKind.MAIN_NOT_A_FUNCTION:
-        const MessageTemplate(MessageKind.MAIN_NOT_A_FUNCTION,
-          "'#{main}' is not a function.",
-          howToFix: DONT_KNOW_HOW_TO_FIX, /* Don't state the obvious. */
-          examples: const ['var main;']),
-
-      MessageKind.MAIN_WITH_EXTRA_PARAMETER:
-        const MessageTemplate(MessageKind.MAIN_WITH_EXTRA_PARAMETER,
-          "'#{main}' cannot have more than two parameters.",
-          howToFix: DONT_KNOW_HOW_TO_FIX, /* Don't state the obvious. */
-          examples: const ['main(a, b, c) {}']),
-
-      MessageKind.COMPILER_CRASHED:
-        const MessageTemplate(MessageKind.COMPILER_CRASHED,
-          "The compiler crashed when compiling this element."),
-
-      MessageKind.PLEASE_REPORT_THE_CRASH:
-        const MessageTemplate(MessageKind.PLEASE_REPORT_THE_CRASH, '''
-The compiler is broken.
-
-When compiling the above element, the compiler crashed. It is not
-possible to tell if this is caused by a problem in your program or
-not. Regardless, the compiler should not crash.
-
-The Dart team would greatly appreciate if you would take a moment to
-report this problem at http://dartbug.com/new.
-
-Please include the following information:
-
-* the name and version of your operating system,
-
-* the Dart SDK build number (#{buildId}), and
-
-* the entire message you see here (including the full stack trace
-  below as well as the source location above).
-'''),
-
-      MessageKind.POTENTIAL_MUTATION:
-        const MessageTemplate(MessageKind.POTENTIAL_MUTATION,
-          "Variable '#{variableName}' is not known to be of type "
-          "'#{shownType}' because it is potentially mutated in the scope for "
-          "promotion."),
-
-      MessageKind.POTENTIAL_MUTATION_HERE:
-        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_HERE,
-          "Variable '#{variableName}' is potentially mutated here."),
-
-      MessageKind.POTENTIAL_MUTATION_IN_CLOSURE:
-        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_IN_CLOSURE,
-          "Variable '#{variableName}' is not known to be of type "
-          "'#{shownType}' because it is potentially mutated within a closure."),
-
-      MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE:
-        const MessageTemplate(MessageKind.POTENTIAL_MUTATION_IN_CLOSURE_HERE,
-              "Variable '#{variableName}' is potentially mutated in a "
-              "closure here."),
-
-      MessageKind.ACCESSED_IN_CLOSURE:
-        const MessageTemplate(MessageKind.ACCESSED_IN_CLOSURE,
-          "Variable '#{variableName}' is not known to be of type "
-          "'#{shownType}' because it is accessed by a closure in the scope for "
-          "promotion and potentially mutated in the scope of "
-          "'#{variableName}'."),
-
-      MessageKind.ACCESSED_IN_CLOSURE_HERE:
-        const MessageTemplate(MessageKind.ACCESSED_IN_CLOSURE_HERE,
-          "Variable '#{variableName}' is accessed in a closure here."),
-
-      MessageKind.NOT_MORE_SPECIFIC:
-        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC,
-          "Variable '#{variableName}' is not shown to have type "
-          "'#{shownType}' because '#{shownType}' is not more specific than the "
-          "known type '#{knownType}' of '#{variableName}'."),
-
-      MessageKind.NOT_MORE_SPECIFIC_SUBTYPE:
-        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC_SUBTYPE,
-          "Variable '#{variableName}' is not shown to have type "
-          "'#{shownType}' because '#{shownType}' is not a subtype of the "
-          "known type '#{knownType}' of '#{variableName}'."),
-
-      MessageKind.NOT_MORE_SPECIFIC_SUGGESTION:
-        const MessageTemplate(MessageKind.NOT_MORE_SPECIFIC_SUGGESTION,
-          "Variable '#{variableName}' is not shown to have type "
-          "'#{shownType}' because '#{shownType}' is not more specific than the "
-          "known type '#{knownType}' of '#{variableName}'.",
-          howToFix:
-            "Try replacing '#{shownType}' with '#{shownTypeSuggestion}'."),
-
-      MessageKind.NO_COMMON_SUBTYPES:
-        const MessageTemplate(MessageKind.NO_COMMON_SUBTYPES,
-           "Types '#{left}' and '#{right}' have no common subtypes."),
-
-      MessageKind.HIDDEN_WARNINGS_HINTS:
-        const MessageTemplate(MessageKind.HIDDEN_WARNINGS_HINTS,
-          "#{warnings} warning(s) and #{hints} hint(s) suppressed in #{uri}."),
-
-      MessageKind.HIDDEN_WARNINGS:
-        const MessageTemplate(MessageKind.HIDDEN_WARNINGS,
-          "#{warnings} warning(s) suppressed in #{uri}."),
-
-      MessageKind.HIDDEN_HINTS:
-        const MessageTemplate(MessageKind.HIDDEN_HINTS,
-          "#{hints} hint(s) suppressed in #{uri}."),
-
-      MessageKind.PREAMBLE:
-        const MessageTemplate(MessageKind.PREAMBLE,
-        "When run on the command-line, the compiled output might"
-        " require a preamble file located in:\n"
-        "  <sdk>/lib/_internal/js_runtime/lib/preambles."),
-
-      MessageKind.INVALID_SYNC_MODIFIER:
-        const MessageTemplate(MessageKind.INVALID_SYNC_MODIFIER,
-          "Invalid modifier 'sync'.",
-          options: const ['--enable-async'],
-          howToFix: "Try replacing 'sync' with 'sync*'.",
-          examples: const [
-            "main() sync {}"
-          ]),
-
-      MessageKind.INVALID_AWAIT_FOR:
-        const MessageTemplate(MessageKind.INVALID_AWAIT_FOR,
-          "'await' is only supported on for-in loops.",
-          options: const ['--enable-async'],
-          howToFix: "Try rewriting the loop as a for-in loop or removing the "
-                    "'await' keyword.",
-          examples: const ["""
-main() async* {
-  await for (int i = 0; i < 10; i++) {}
-}
-"""]),
-
-      MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD:
-        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_ABSTRACT_METHOD,
-          "The modifier '#{modifier}' is not allowed on an abstract method.",
-          options: const ['--enable-async'],
-          howToFix: "Try removing the '#{modifier}' modifier or adding a "
-                    "body to the method.",
-          examples: const ["""
-abstract class A {
-  method() async;
-}
-class B extends A {
-  method() {}
-}
-main() {
-  A a = new B();
-  a.method();
-}
-"""]),
-
-      MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_CONSTRUCTOR,
-              "The modifier '#{modifier}' is not allowed on constructors.",
-              options: const ['--enable-async'],
-              howToFix: "Try removing the '#{modifier}' modifier.",
-              examples: const ["""
-class A {
-  A() async;
-}
-main() => new A();""",
-
-"""
-class A {
-  A();
-  factory A.a() async* {}
-}
-main() => new A.a();"""]),
-
-      MessageKind.ASYNC_MODIFIER_ON_SETTER:
-        const MessageTemplate(MessageKind.ASYNC_MODIFIER_ON_SETTER,
-              "The modifier '#{modifier}' is not allowed on setters.",
-              options: const ['--enable-async'],
-              howToFix: "Try removing the '#{modifier}' modifier.",
-              examples: const ["""
-class A {
-  set foo(v) async {}
-}
-main() => new A().foo = 0;"""]),
-
-      MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY:
-        const MessageTemplate(MessageKind.YIELDING_MODIFIER_ON_ARROW_BODY,
-          "The modifier '#{modifier}' is not allowed on methods implemented "
-          "using '=>'.",
-          options: const ['--enable-async'],
-          howToFix: "Try removing the '#{modifier}' modifier or implementing "
-                    "the method body using a block: '{ ... }'.",
-          examples: const ["main() sync* => null;", "main() async* => null;"]),
-
-      // TODO(johnniwinther): Check for 'async' as identifier.
-      MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER:
-        const MessageTemplate(MessageKind.ASYNC_KEYWORD_AS_IDENTIFIER,
-          "'#{keyword}' cannot be used as an identifier in a function body "
-          "marked with '#{modifier}'.",
-          options: const ['--enable-async'],
-          howToFix: "Try removing the '#{modifier}' modifier or renaming the "
-                    "identifier.",
-          examples: const ["""
-main() async {
- var await;
-}""",
-"""
-main() async* {
- var yield;
-}""",
-"""
-main() sync* {
- var yield;
-}"""]),
-
-      MessageKind.RETURN_IN_GENERATOR:
-        const MessageTemplate(MessageKind.RETURN_IN_GENERATOR,
-          "'return' with a value is not allowed in a method body using the "
-          "'#{modifier}' modifier.",
-          howToFix: "Try removing the value, replacing 'return' with 'yield' "
-                    "or changing the method body modifier.",
-          examples: const [
-"""
-foo() async* { return 0; }
-main() => foo();
-""",
-
-"""
-foo() sync* { return 0; }
-main() => foo();
-"""]),
-
-      MessageKind.NATIVE_NOT_SUPPORTED:
-        const MessageTemplate(MessageKind.NATIVE_NOT_SUPPORTED,
-          "'native' modifier is not supported.",
-          howToFix: "Try removing the 'native' implementation or analyzing the "
-                    "code with the --allow-native-extensions option.",
-          examples: const ["""
-main() native "Main";
-"""]),
-
-      MessageKind.DART_EXT_NOT_SUPPORTED:
-        const MessageTemplate(MessageKind.DART_EXT_NOT_SUPPORTED,
-          "The 'dart-ext' scheme is not supported.",
-          howToFix: "Try analyzing the code with the --allow-native-extensions "
-                    "option.",
-          examples: const ["""
-import 'dart-ext:main';
-
-main() {}
-"""]),
-
-      MessageKind.LIBRARY_TAG_MUST_BE_FIRST:
-        const MessageTemplate(MessageKind.LIBRARY_TAG_MUST_BE_FIRST,
-          "The library declaration should come before other declarations.",
-          howToFix: "Try moving the declaration to the top of the file.",
-          examples: const [
-"""
-import 'dart:core';
-library foo;
-main() {}
-""",
-      ]),
-
-      MessageKind.ONLY_ONE_LIBRARY_TAG:
-        const MessageTemplate(MessageKind.ONLY_ONE_LIBRARY_TAG,
-          "There can only be one library declaration.",
-          howToFix: "Try removing all other library declarations.",
-          examples: const [
-"""
-library foo;
-library bar;
-main() {}
-""",
-"""
-library foo;
-import 'dart:core';
-library bar;
-main() {}
-""",
-      ]),
-
-      MessageKind.IMPORT_BEFORE_PARTS:
-        const MessageTemplate(MessageKind.IMPORT_BEFORE_PARTS,
-          "Import declarations should come before parts.",
-          howToFix: "Try moving this import further up in the file.",
-          examples: const [
-              const <String, String>{
-                'main.dart': """
-library test.main;
-part 'part.dart';
-import 'dart:core';
-main() {}
-""",
-                'part.dart': """
-part of test.main;
-""",
-          }]),
-
-      MessageKind.EXPORT_BEFORE_PARTS:
-        const MessageTemplate(MessageKind.EXPORT_BEFORE_PARTS,
-          "Export declarations should come before parts.",
-          howToFix: "Try moving this export further up in the file.",
-          examples: const [
-              const <String, String>{
-                'main.dart': """
-library test.main;
-part 'part.dart';
-export 'dart:core';
-main() {}
-""",
-               'part.dart': """
-part of test.main;
-""",
-          }]),
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Patch errors start.
-  //////////////////////////////////////////////////////////////////////////////
-
-      MessageKind.PATCH_RETURN_TYPE_MISMATCH:
-        const MessageTemplate(MessageKind.PATCH_RETURN_TYPE_MISMATCH,
-          "Patch return type '#{patchReturnType}' does not match "
-          "'#{originReturnType}' on origin method '#{methodName}'."),
-
-      MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH:
-        const MessageTemplate(
-          MessageKind.PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH,
-          "Required parameter count of patch method "
-          "(#{patchParameterCount}) does not match parameter count on origin "
-          "method '#{methodName}' (#{originParameterCount})."),
-
-      MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH:
-        const MessageTemplate(
-          MessageKind.PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH,
-          "Optional parameter count of patch method "
-          "(#{patchParameterCount}) does not match parameter count on origin "
-          "method '#{methodName}' (#{originParameterCount})."),
-
-      MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH:
-        const MessageTemplate(
-          MessageKind.PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH,
-          "Optional parameters of origin and patch method "
-          "'#{methodName}' must both be either named or positional."),
-
-      MessageKind.PATCH_PARAMETER_MISMATCH:
-        const MessageTemplate(MessageKind.PATCH_PARAMETER_MISMATCH,
-          "Patch method parameter '#{patchParameter}' does not match "
-          "'#{originParameter}' on origin method '#{methodName}'."),
-
-      MessageKind.PATCH_PARAMETER_TYPE_MISMATCH:
-        const MessageTemplate(MessageKind.PATCH_PARAMETER_TYPE_MISMATCH,
-          "Patch method parameter '#{parameterName}' type "
-          "'#{patchParameterType}' does not match '#{originParameterType}' on "
-          "origin method '#{methodName}'."),
-
-      MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION:
-        const MessageTemplate(MessageKind.PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION,
-          "External method without an implementation."),
-
-      MessageKind.PATCH_POINT_TO_FUNCTION:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_FUNCTION,
-          "This is the function patch '#{functionName}'."),
-
-      MessageKind.PATCH_POINT_TO_CLASS:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_CLASS,
-          "This is the class patch '#{className}'."),
-
-      MessageKind.PATCH_POINT_TO_GETTER:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_GETTER,
-          "This is the getter patch '#{getterName}'."),
-
-      MessageKind.PATCH_POINT_TO_SETTER:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_SETTER,
-          "This is the setter patch '#{setterName}'."),
-
-      MessageKind.PATCH_POINT_TO_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_CONSTRUCTOR,
-          "This is the constructor patch '#{constructorName}'."),
-
-      MessageKind.PATCH_POINT_TO_PARAMETER:
-        const MessageTemplate(MessageKind.PATCH_POINT_TO_PARAMETER,
-          "This is the patch parameter '#{parameterName}'."),
-
-      MessageKind.PATCH_NON_EXISTING:
-        const MessageTemplate(MessageKind.PATCH_NON_EXISTING,
-          "Origin does not exist for patch '#{name}'."),
-
-      // TODO(ahe): Eventually, this error should be removed as it will be
-      // handled by the regular parser.
-      MessageKind.PATCH_NONPATCHABLE:
-        const MessageTemplate(MessageKind.PATCH_NONPATCHABLE,
-          "Only classes and functions can be patched."),
-
-      MessageKind.PATCH_NON_EXTERNAL:
-        const MessageTemplate(MessageKind.PATCH_NON_EXTERNAL,
-          "Only external functions can be patched."),
-
-      MessageKind.PATCH_NON_CLASS:
-        const MessageTemplate(MessageKind.PATCH_NON_CLASS,
-          "Patching non-class with class patch '#{className}'."),
-
-      MessageKind.PATCH_NON_GETTER:
-        const MessageTemplate(MessageKind.PATCH_NON_GETTER,
-          "Cannot patch non-getter '#{name}' with getter patch."),
-
-      MessageKind.PATCH_NO_GETTER:
-        const MessageTemplate(MessageKind.PATCH_NO_GETTER,
-          "No getter found for getter patch '#{getterName}'."),
-
-      MessageKind.PATCH_NON_SETTER:
-        const MessageTemplate(MessageKind.PATCH_NON_SETTER,
-          "Cannot patch non-setter '#{name}' with setter patch."),
-
-      MessageKind.PATCH_NO_SETTER:
-        const MessageTemplate(MessageKind.PATCH_NO_SETTER,
-          "No setter found for setter patch '#{setterName}'."),
-
-      MessageKind.PATCH_NON_CONSTRUCTOR:
-        const MessageTemplate(MessageKind.PATCH_NON_CONSTRUCTOR,
-          "Cannot patch non-constructor with constructor patch "
-          "'#{constructorName}'."),
-
-      MessageKind.PATCH_NON_FUNCTION:
-        const MessageTemplate(MessageKind.PATCH_NON_FUNCTION,
-          "Cannot patch non-function with function patch "
-          "'#{functionName}'."),
-
-      MessageKind.INJECTED_PUBLIC_MEMBER:
-        const MessageTemplate(MessageKind.INJECTED_PUBLIC_MEMBER,
-            "Non-patch members in patch libraries must be private."),
-
-      MessageKind.EXTERNAL_WITH_BODY:
-        const MessageTemplate(MessageKind.EXTERNAL_WITH_BODY,
-          "External function '#{functionName}' cannot have a function body.",
-          options: const ["--output-type=dart"],
-          howToFix:
-            "Try removing the 'external' modifier or the function body.",
-          examples: const ["""
-external foo() => 0;
-main() => foo();
-""", """
-external foo() {}
-main() => foo();
-"""]),
-
-  //////////////////////////////////////////////////////////////////////////////
-  // Patch errors end.
-  //////////////////////////////////////////////////////////////////////////////
-
-      MessageKind.EXPERIMENTAL_ASSERT_MESSAGE:
-        const MessageTemplate(MessageKind.EXPERIMENTAL_ASSERT_MESSAGE,
-          "Experimental language feature 'assertion with message'"
-          " is not supported.",
-          howToFix:
-            "Use option '--assert-message' to use assertions with messages.",
-          examples: const [r'''
-main() {
-  int n = -7;
-  assert(n > 0, 'must be positive: $n');
-}
-''']),
-
-      MessageKind.IMPORT_EXPERIMENTAL_MIRRORS:
-        const MessageTemplate(MessageKind.IMPORT_EXPERIMENTAL_MIRRORS, r'''
-
-****************************************************************
-* WARNING: dart:mirrors support in dart2js is experimental,
-*          and not recommended.
-*          This implementation of mirrors is incomplete,
-*          and often greatly increases the size of the generated
-*          JavaScript code.
-*
-* Your app imports dart:mirrors via:''''''
-$IMPORT_EXPERIMENTAL_MIRRORS_PADDING#{importChain}
-*
-* You can disable this message by using the --enable-experimental-mirrors
-* command-line flag.
-*
-* To learn what to do next, please visit:
-*    http://dartlang.org/dart2js-reflection
-****************************************************************
-'''),
-
-      MessageKind.DISALLOWED_LIBRARY_IMPORT:
-        const MessageTemplate(MessageKind.DISALLOWED_LIBRARY_IMPORT, '''
-Your app imports the unsupported library '#{uri}' via:
-''''''
-$DISALLOWED_LIBRARY_IMPORT_PADDING#{importChain}
-
-Use the --categories option to support import of '#{uri}'.
-'''),
-
-      MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND:
-        const MessageTemplate(
-          MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND,
-          """
-dart:mirrors library is not supported when using this backend.
-
-Your app imports dart:mirrors via:""""""
-$MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING#{importChain}"""),
-
-      MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS:
-        const MessageTemplate(MessageKind.CALL_NOT_SUPPORTED_ON_NATIVE_CLASS,
-          "Non-supported 'call' member on a native class, or a "
-          "subclass of a native class."),
-
-      MessageKind.DIRECTLY_THROWING_NSM:
-        const MessageTemplate(MessageKind.DIRECTLY_THROWING_NSM,
-          "This 'noSuchMethod' implementation is guaranteed to throw an "
-          "exception. The generated code will be smaller if it is "
-          "rewritten.",
-          howToFix: "Rewrite to "
-                    "'noSuchMethod(Invocation i) => super.noSuchMethod(i);'."),
-
-      MessageKind.COMPLEX_THROWING_NSM:
-        const MessageTemplate(MessageKind.COMPLEX_THROWING_NSM,
-          "This 'noSuchMethod' implementation is guaranteed to throw an "
-          "exception. The generated code will be smaller and the compiler "
-          "will be able to perform more optimizations if it is rewritten.",
-          howToFix: "Rewrite to "
-                    "'noSuchMethod(Invocation i) => super.noSuchMethod(i);'."),
-
-      MessageKind.COMPLEX_RETURNING_NSM:
-        const MessageTemplate(MessageKind.COMPLEX_RETURNING_NSM,
-          "Overriding 'noSuchMethod' causes the compiler to generate "
-          "more code and prevents the compiler from doing some optimizations.",
-          howToFix: "Consider removing this 'noSuchMethod' implementation."),
-
-      MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP:
-        const MessageTemplate(MessageKind.UNRECOGNIZED_VERSION_OF_LOOKUP_MAP,
-          "Unsupported version of package:lookup_map.",
-          howToFix: DONT_KNOW_HOW_TO_FIX),
-
-  }; // End of TEMPLATES.
-
-  /// Padding used before and between import chains in the message for
-  /// [MessageKind.IMPORT_EXPERIMENTAL_MIRRORS].
-  static const String IMPORT_EXPERIMENTAL_MIRRORS_PADDING = '\n*   ';
-
-  /// Padding used before and between import chains in the message for
-  /// [MessageKind.MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND].
-  static const String MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING = '\n   ';
-
-  /// Padding used before and between import chains in the message for
-  /// [MessageKind.DISALLOWED_LIBRARY_IMPORT].
-  static const String DISALLOWED_LIBRARY_IMPORT_PADDING = '\n  ';
+      this.howToFix,
+      this.examples,
+      this.options);
 
   toString() => template;
 
   Message message([Map arguments = const {}, bool terse = false]) {
     return new Message(this, arguments, terse);
   }
 
-  bool get hasHowToFix => howToFix != null && howToFix != DONT_KNOW_HOW_TO_FIX;
+  bool get hasHowToFix => howToFix != null &&
+      howToFix != dart2js_messages.DONT_KNOW_HOW_TO_FIX;
+
+  static final Map<MessageKind, MessageTemplate> TEMPLATES =
+      _constructMessageTemplates();
+
+  static Map<String, MessageTemplate> _constructMessageTemplates() {
+    Map<MessageKind, MessageTemplate> result = <MessageKind, MessageTemplate>{};
+    for (MessageKind kind in MessageKind.values) {
+      String name = _KIND_TO_STRING_MAP[kind];
+      Map data =
+          shared_messages.MESSAGES[name] ?? dart2js_messages.MESSAGES[name];
+      if (data == null) throw new ArgumentError.value(name);
+
+      String id = data['id'];
+      String template = data['template'];
+      String howToFix = data['howToFix'];
+      List examples = data['examples'];
+      List<String> options = data['options'] ?? const <String>[];
+      result[kind] = new MessageTemplate(
+          kind, id, template, howToFix, examples, options);
+    }
+    return result;
+  }
 }
 
 class Message {
   final MessageTemplate template;
   final Map arguments;
   final bool terse;
   String message;
 
   Message(this.template, this.arguments, this.terse) {
     assert(() { computeMessage(); return true; });
@@ skipping 37 matching lines @@
   static String convertToString(value) {
     if (value is ErrorToken) {
       // Shouldn't happen.
       return value.assertionMessage;
     } else if (value is Token) {
       value = value.value;
     }
     return '$value';
   }
 }