Move messages out of dart2js.

pkg/compiler/lib/src/diagnostics/dart2js_messages.dart

+// Copyright (c) 2015, 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].
+
+/// Padding used before and between import chains in the message for
+/// [MessageKind.IMPORT_EXPERIMENTAL_MIRRORS].
+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].
+const String MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING = '\n   ';
+
+/// Padding used before and between import chains in the message for
+/// [MessageKind.DISALLOWED_LIBRARY_IMPORT].
+const String DISALLOWED_LIBRARY_IMPORT_PADDING = '\n  ';
+
+const DONT_KNOW_HOW_TO_FIX = "Computer says no!";
+
+final Map<String, Map> MESSAGES = {
+  /// 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.
+  'GENERIC': {'id': 'SOWPSL', 'template': "#{text}",},
+
+  'NOT_ASSIGNABLE': {
+    'id': 'VYNMAP',
+    'template': "'#{fromType}' is not assignable to '#{toType}'.",
+  },
+
+  'FORIN_NOT_ASSIGNABLE': {
+    'id': 'XQSRXO',
+    'template': "The element type '#{currentType}' of '#{expressionType}' "
+        "is not assignable to '#{elementType}'.",
+  },
+
+  'VOID_EXPRESSION': {
+    'id': 'QHEVSC',
+    'template': "Expression does not yield a value.",
+  },
+
+  'VOID_VARIABLE': {
+    'id': 'RFEURK',
+    'template': "Variable cannot be of type void.",
+  },
+
+  'RETURN_VALUE_IN_VOID': {
+    'id': 'FUNYDS',
+    'template': "Cannot return value from void function.",
+  },
+
+  'RETURN_NOTHING': {
+    'id': 'HPPODJ',
+    'template': "Value of type '#{returnType}' expected.",
+  },
+
+  'MISSING_ARGUMENT': {
+    'id': 'LHMCIK',
+    'template': "Missing argument of type '#{argumentType}'.",
+  },
+
+  'ADDITIONAL_ARGUMENT': {'id': 'GMITMA', 'template': "Additional argument.",},
+
+  'NAMED_ARGUMENT_NOT_FOUND': {
+    'id': 'UCEARQ',
+    'template': "No named argument '#{argumentName}' found on method.",
+  },
+
+  'MEMBER_NOT_FOUND': {
+    'id': 'MMQODC',
+    'template': "No member named '#{memberName}' in class '#{className}'.",
+  },
+
+  'AWAIT_MEMBER_NOT_FOUND': {
+    'id': 'XIDLIP',
+    'template': "No member named 'await' in class '#{className}'.",
+    'howToFix': "Did you mean to add the 'async' marker "
+        "to '#{functionName}'?",
+    'examples': [
+      """
+class A {
+m() => await -3;
+}
+main() => new A().m();
+"""
+    ],
+  },
+
+  'AWAIT_MEMBER_NOT_FOUND_IN_CLOSURE': {
+    'id': 'HBIYGN',
+    'template': "No member named 'await' in class '#{className}'.",
+    'howToFix': "Did you mean to add the 'async' marker "
+        "to the enclosing function?",
+    'examples': [
+      """
+class A {
+m() => () => await -3;
+}
+main() => new A().m();
+"""
+    ],
+  },
+
+  'METHOD_NOT_FOUND': {
+    'id': 'QYYHBU',
+    'template': "No method named '#{memberName}' in class '#{className}'.",
+  },
+
+  'OPERATOR_NOT_FOUND': {
+    'id': 'SXGOYS',
+    'template': "No operator '#{memberName}' in class '#{className}'.",
+  },
+
+  'SETTER_NOT_FOUND': {
+    'id': 'ADFRVF',
+    'template': "No setter named '#{memberName}' in class '#{className}'.",
+  },
+
+  'SETTER_NOT_FOUND_IN_SUPER': {
+    'id': 'OCVRNJ',
+    'template': "No setter named '#{name}' in superclass of '#{className}'.",
+  },
+
+  'GETTER_NOT_FOUND': {
+    'id': 'PBNXAC',
+    'template': "No getter named '#{memberName}' in class '#{className}'.",
+  },
+
+  'NOT_CALLABLE': {
+    'id': 'SEMKJO',
+    'template': "'#{elementName}' is not callable.",
+  },
+
+  'MEMBER_NOT_STATIC': {
+    'id': 'QIOISX',
+    'template': "'#{className}.#{memberName}' is not static.",
+  },
+
+  'NO_INSTANCE_AVAILABLE': {
+    'id': 'FQPYLR',
+    'template': "'#{name}' is only available in instance methods.",
+  },
+
+  'NO_THIS_AVAILABLE': {
+    'id': 'LXPXKG',
+    'template': "'this' is only available in instance methods.",
+  },
+
+  'PRIVATE_ACCESS': {
+    'id': 'DIMHCR',
+    'template': "'#{name}' is declared private within library "
+        "'#{libraryName}'.",
+  },
+
+  'THIS_IS_THE_DECLARATION': {
+    'id': 'YIJWTO',
+    'template': "This is the declaration of '#{name}'.",
+  },
+
+  'THIS_IS_THE_METHOD': {
+    'id': 'PYXWLF',
+    'template': "This is the method declaration.",
+  },
+
+  'CANNOT_RESOLVE': {'id': 'SPVJYO', 'template': "Cannot resolve '#{name}'.",},
+
+  'CANNOT_RESOLVE_AWAIT': {
+    'id': 'YQYLRS',
+    'template': "Cannot resolve '#{name}'.",
+    'howToFix': "Did you mean to add the 'async' marker "
+        "to '#{functionName}'?",
+    'examples': ["main() => await -3;", "foo() => await -3; main() => foo();"],
+  },
+
+  'CANNOT_RESOLVE_AWAIT_IN_CLOSURE': {
+    'id': 'SIXRAA',
+    'template': "Cannot resolve '#{name}'.",
+    'howToFix': "Did you mean to add the 'async' marker "
+        "to the enclosing function?",
+    'examples': ["main() { (() => await -3)(); }",],
+  },
+
+  'CANNOT_RESOLVE_IN_INITIALIZER': {
+    'id': 'VVEQFD',
+    'template':
+        "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': [
+      """
+class A {
+var test = unresolvedName;
+}
+main() => new A();
+"""
+    ],
+  },
+
+  'CANNOT_RESOLVE_CONSTRUCTOR': {
+    'id': 'QRPATN',
+    'template': "Cannot resolve constructor '#{constructorName}'.",
+  },
+
+  'CANNOT_RESOLVE_CONSTRUCTOR_FOR_IMPLICIT': {
+    'id': 'IFKCHF',
+    'template': "cannot resolve constructor '#{constructorName}' "
+        "for implicit super call.",
+    'howToFix': "Try explicitly invoking a constructor of the super class",
+    'examples': [
+      """
+class A {
+A.foo() {}
+}
+class B extends A {
+B();
+}
+main() => new B();
+"""
+    ],
+  },
+
+  'INVALID_UNNAMED_CONSTRUCTOR_NAME': {
+    'id': 'VPJLVI',
+    'template': "Unnamed constructor name must be '#{name}'.",
+  },
+
+  'INVALID_CONSTRUCTOR_NAME': {
+    'id': 'LMDCAS',
+    'template': "Constructor name must start with '#{name}'.",
+  },
+
+  'CANNOT_RESOLVE_TYPE': {
+    'id': 'PQIAPG',
+    'template': "Cannot resolve type '#{typeName}'.",
+  },
+
+  'DUPLICATE_DEFINITION': {
+    'id': 'LVTYNW',
+    'template': "Duplicate definition of '#{name}'.",
+    'howToFix': "Try to rename or remove this definition.",
+    'examples': [
+      """
+class C {
+void f() {}
+int get f => 1;
+}
+
+main() {
+new C();
+}
+
+"""
+    ],
+  },
+
+  'EXISTING_DEFINITION': {
+    'id': 'DAUYKK',
+    'template': "Existing definition of '#{name}'.",
+  },
+
+  'DUPLICATE_IMPORT': {
+    'id': 'KYJFJN',
+    'template': "Duplicate import of '#{name}'.",
+  },
+
+  'HIDDEN_IMPORT': {
+    'id': 'ACRDPR',
+    'template': "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
+        "from library '#{hidingUri}'.",
+    'howToFix': "Try adding 'hide #{name}' to the import of '#{hiddenUri}'.",
+    'examples': [
+      {
+        'main.dart': """
+import 'dart:async'; // This imports a class Future.
+import 'future.dart';
+
+void main() => new Future();""",
+        'future.dart': """
+library future;
+
+class Future {}"""
+      },
+      {
+        'main.dart': """
+import 'future.dart';
+import 'dart:async'; // This imports a class Future.
+
+void main() => new Future();""",
+        'future.dart': """
+library future;
+
+class Future {}"""
+      },
+      {
+        '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';"""
+      },
+      {
+        '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 {}"""
+      }
+    ],
+  },
+
+  'HIDDEN_IMPLICIT_IMPORT': {
+    'id': 'WDNFSI',
+    'template': "'#{name}' from library '#{hiddenUri}' is hidden by '#{name}' "
+        "from library '#{hidingUri}'.",
+    'howToFix': "Try adding an explicit "
+        "'import \"#{hiddenUri}\" hide #{name}'.",
+    'examples': [
+      {
+        '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 {}"""
+      },
+      {
+        '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}");
+}
+"""
+      }
+    ],
+  },
+
+  'DUPLICATE_EXPORT': {
+    'id': 'XGNOCL',
+    'template': "Duplicate export of '#{name}'.",
+    'howToFix': "Try adding 'hide #{name}' to one of the exports.",
+    'examples': [
+      {
+        'main.dart': """
+export 'decl1.dart';
+export 'decl2.dart';
+
+main() {}""",
+        'decl1.dart': "class Class {}",
+        'decl2.dart': "class Class {}"
+      }
+    ],
+  },
+
+  'DUPLICATE_EXPORT_CONT': {
+    'id': 'BDROED',
+    'template': "This is another export of '#{name}'.",
+  },
+
+  'DUPLICATE_EXPORT_DECL': {
+    'id': 'GFFLMA',
+    'template':
+        "The exported '#{name}' from export #{uriString} is defined here.",
+  },
+
+  'EMPTY_HIDE': {
+    'id': 'ODFAOC',
+    'template': "Library '#{uri}' doesn't export a '#{name}' declaration.",
+    'howToFix': "Try removing '#{name}' the 'hide' clause.",
+    'examples': [
+      {
+        'main.dart': """
+import 'dart:core' hide Foo;
+
+main() {}"""
+      },
+      {
+        'main.dart': """
+export 'dart:core' hide Foo;
+
+main() {}"""
+      },
+    ],
+  },
+
+  'EMPTY_SHOW': {
+    'id': 'EXONIK',
+    'template': "Library '#{uri}' doesn't export a '#{name}' declaration.",
+    'howToFix': "Try removing '#{name}' from the 'show' clause.",
+    'examples': [
+      {
+        'main.dart': """
+import 'dart:core' show Foo;
+
+main() {}"""
+      },
+      {
+        'main.dart': """
+export 'dart:core' show Foo;
+
+main() {}"""
+      },
+    ],
+  },
+
+  'NOT_A_TYPE': {'id': 'CTTAXD', 'template': "'#{node}' is not a type.",},
+
+  'NOT_A_PREFIX': {'id': 'LKEUMI', 'template': "'#{node}' is not a prefix.",},
+
+  'PREFIX_AS_EXPRESSION': {
+    'id': 'CYIMBJ',
+    'template': "Library prefix '#{prefix}' is not a valid expression.",
+  },
+
+  'CANNOT_FIND_CONSTRUCTOR': {
+    'id': 'DROVNH',
+    'template': "Cannot find constructor '#{constructorName}' in class "
+        "'#{className}'.",
+  },
+
+  'CANNOT_FIND_UNNAMED_CONSTRUCTOR': {
+    'id': 'GDCTGB',
+    'template': "Cannot find unnamed constructor in class "
+        "'#{className}'.",
+  },
+
+  'CYCLIC_CLASS_HIERARCHY': {
+    'id': 'HKFYOA',
+    'template': "'#{className}' creates a cycle in the class hierarchy.",
+  },
+
+  'CYCLIC_REDIRECTING_FACTORY': {
+    'id': 'QGETJC',
+    'template': "Redirecting factory leads to a cyclic redirection.",
+  },
+
+  'INVALID_RECEIVER_IN_INITIALIZER': {
+    'id': 'SYUTHA',
+    'template': "Field initializer expected.",
+  },
+
+  'NO_SUPER_IN_STATIC': {
+    'id': 'HSCESG',
+    'template': "'super' is only available in instance methods.",
+  },
+
+  'DUPLICATE_INITIALIZER': {
+    'id': 'GKVFEP',
+    'template': "Field '#{fieldName}' is initialized more than once.",
+  },
+
+  'ALREADY_INITIALIZED': {
+    'id': 'NCRMVD',
+    'template': "'#{fieldName}' was already initialized here.",
+  },
+
+  'INIT_STATIC_FIELD': {
+    'id': 'DBSRHA',
+    'template': "Cannot initialize static field '#{fieldName}'.",
+  },
+
+  'NOT_A_FIELD': {
+    'id': 'FYEPLC',
+    'template': "'#{fieldName}' is not a field.",
+  },
+
+  'CONSTRUCTOR_CALL_EXPECTED': {
+    'id': 'GEJCDX',
+    'template': "only call to 'this' or 'super' constructor allowed.",
+  },
+
+  'INVALID_FOR_IN': {
+    'id': 'AUQJBG',
+    'template': "Invalid for-in variable declaration.",
+  },
+
+  'INVALID_INITIALIZER': {'id': 'JKUKSA', 'template': "Invalid initializer.",},
+
+  'FUNCTION_WITH_INITIALIZER': {
+    'id': 'BNRDDK',
+    'template': "Only constructors can have initializers.",
+  },
+
+  'REDIRECTING_CONSTRUCTOR_CYCLE': {
+    'id': 'CQTMEP',
+    'template': "Cyclic constructor redirection.",
+  },
+
+  'REDIRECTING_CONSTRUCTOR_HAS_BODY': {
+    'id': 'WXJQNE',
+    'template': "Redirecting constructor can't have a body.",
+  },
+
+  'CONST_CONSTRUCTOR_HAS_BODY': {
+    'id': 'GNEFQG',
+    'template': "Const constructor or factory can't have a body.",
+    'howToFix': "Remove the 'const' keyword or the body",
+    'examples': [
+      """
+class C {
+const C() {}
+}
+
+main() => new C();"""
+    ],
+  },
+
+  'REDIRECTING_CONSTRUCTOR_HAS_INITIALIZER': {
+    'id': 'NUIDSF',
+    'template': "Redirecting constructor cannot have other initializers.",
+  },
+
+  'SUPER_INITIALIZER_IN_OBJECT': {
+    'id': 'DXYGND',
+    'template': "'Object' cannot have a super initializer.",
+  },
+
+  'DUPLICATE_SUPER_INITIALIZER': {
+    'id': 'FFKOWP',
+    'template': "Cannot have more than one super initializer.",
+  },
+
+  'SUPER_CALL_TO_FACTORY': {
+    'id': 'YTOWGV',
+    'template': "The target of the superinitializer must be a generative "
+        "constructor.",
+    'howToFix': "Try calling another constructor on the superclass.",
+    'examples': [
+      """
+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();
+"""
+    ],
+  },
+
+  'THIS_CALL_TO_FACTORY': {
+    'id': 'JLATDB',
+    'template': "The target of the redirection clause must be a generative "
+        "constructor",
+    'howToFix': "Try redirecting to another constructor.",
+    'examples': [
+      """
+class Class {
+factory Class() => null;
+Class.foo() : this();
+}
+main() => new Class.foo();
+""",
+      """
+class Class {
+factory Class.foo() => null;
+Class() : this.foo();
+}
+main() => new Class();
+"""
+    ],
+  },
+
+  'INVALID_CONSTRUCTOR_ARGUMENTS': {
+    'id': 'WVPLKL',
+    'template': "Arguments do not match the expected parameters of constructor "
+        "'#{constructorName}'.",
+  },
+
+  'NO_MATCHING_CONSTRUCTOR': {
+    'id': 'OJQQLE',
+    'template':
+        "'super' call arguments and constructor parameters do not match.",
+  },
+
+  'NO_MATCHING_CONSTRUCTOR_FOR_IMPLICIT': {
+    'id': 'WHCVID',
+    'template': "Implicit 'super' call arguments and constructor parameters "
+        "do not match.",
+  },
+
+  'CONST_CALLS_NON_CONST': {
+    'id': 'CQFHXC',
+    'template': "'const' constructor cannot call a non-const constructor.",
+  },
+
+  'CONST_CALLS_NON_CONST_FOR_IMPLICIT': {
+    'id': 'SFCEXS',
+    'template': "'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': [
+      """
+class C {
+C(); // missing const
+}
+class D extends C {
+final d;
+const D(this.d);
+}
+main() => new D(0);"""
+    ],
+  },
+
+  'CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS': {
+    'id': 'XBHUDL',
+    'template': "Can't declare constructor 'const' on class #{className} "
+        "because the class contains non-final instance fields.",
+    'howToFix': "Try making all fields final.",
+    'examples': [
+      """
+class C {
+// 'a' must be declared final to allow for the const constructor.
+var a;
+const C(this.a);
+}
+
+main() => new C(0);"""
+    ],
+  },
+
+  'CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_FIELD': {
+    'id': 'YYAHVD',
+    'template': "This non-final field prevents using const constructors.",
+  },
+
+  'CONST_CONSTRUCTOR_WITH_NONFINAL_FIELDS_CONSTRUCTOR': {
+    'id': 'FROWJB',
+    'template': "This const constructor is not allowed due to "
+        "non-final fields.",
+  },
+
+  'INITIALIZING_FORMAL_NOT_ALLOWED': {
+    'id': 'YIPXYP',
+    'template': "Initializing formal parameter only allowed in generative "
+        "constructor.",
+  },
+
+  'INVALID_PARAMETER': {
+    'id': 'OWWLIX',
+    'template': "Cannot resolve parameter.",
+  },
+
+  'NOT_INSTANCE_FIELD': {
+    'id': 'VSPKMU',
+    'template': "'#{fieldName}' is not an instance field.",
+  },
+
+  'THIS_PROPERTY': {'id': 'MWFIGH', 'template': "Expected an identifier.",},
+
+  'NO_CATCH_NOR_FINALLY': {
+    'id': 'OPJXPP',
+    'template': "Expected 'catch' or 'finally'.",
+  },
+
+  'EMPTY_CATCH_DECLARATION': {
+    'id': 'UNHCPY',
+    'template': "Expected an identifier in catch declaration.",
+  },
+
+  'EXTRA_CATCH_DECLARATION': {
+    'id': 'YGGRAK',
+    'template': "Extra parameter in catch declaration.",
+  },
+
+  'PARAMETER_WITH_TYPE_IN_CATCH': {
+    'id': 'EXQVDU',
+    'template': "Cannot use type annotations in catch.",
+  },
+
+  'PARAMETER_WITH_MODIFIER_IN_CATCH': {
+    'id': 'BQLKRF',
+    'template': "Cannot use modifiers in catch.",
+  },
+
+  'OPTIONAL_PARAMETER_IN_CATCH': {
+    'id': 'DAICPP',
+    'template': "Cannot use optional parameters in catch.",
+  },
+
+  'THROW_WITHOUT_EXPRESSION': {
+    'id': 'YHACYV',
+    'template': "Cannot use re-throw outside of catch block "
+        "(expression expected after 'throw').",
+  },
+
+  'UNBOUND_LABEL': {
+    'id': 'GLDXHY',
+    'template': "Cannot resolve label '#{labelName}'.",
+  },
+
+  'NO_BREAK_TARGET': {
+    'id': 'VBXXBE',
+    'template': "'break' statement not inside switch or loop.",
+  },
+
+  'NO_CONTINUE_TARGET': {
+    'id': 'JTTHHM',
+    'template': "'continue' statement not inside loop.",
+  },
+
+  'EXISTING_LABEL': {
+    'id': 'AHCSXF',
+    'template': "Original declaration of duplicate label '#{labelName}'.",
+  },
+
+  'DUPLICATE_LABEL': {
+    'id': 'HPULLI',
+    'template': "Duplicate declaration of label '#{labelName}'.",
+  },
+
+  'UNUSED_LABEL': {'id': 'KFREJO', 'template': "Unused label '#{labelName}'.",},
+
+  'INVALID_CONTINUE': {
+    'id': 'DSKTPX',
+    'template': "Target of continue is not a loop or switch case.",
+  },
+
+  'INVALID_BREAK': {
+    'id': 'MFCCWX',
+    'template': "Target of break is not a statement.",
+  },
+
+  'DUPLICATE_TYPE_VARIABLE_NAME': {
+    'id': 'BAYCCM',
+    'template': "Type variable '#{typeVariableName}' already declared.",
+  },
+
+  'TYPE_VARIABLE_WITHIN_STATIC_MEMBER': {
+    'id': 'XQLXRL',
+    'template': "Cannot refer to type variable '#{typeVariableName}' "
+        "within a static member.",
+  },
+
+  'TYPE_VARIABLE_IN_CONSTANT': {
+    'id': 'ANDEVG',
+    'template': "Constant expressions can't refer to type variables.",
+    'howToFix': "Try removing the type variable or replacing it with a "
+        "concrete type.",
+    'examples': [
+      """
+class C<T> {
+const C();
+
+m(T t) => const C<T>();
+}
+
+void main() => new C().m(null);
+"""
+    ],
+  },
+
+  'INVALID_TYPE_VARIABLE_BOUND': {
+    'id': 'WQAEDK',
+    'template': "'#{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': [
+      """
+class C<T extends num> {}
+
+// 'String' is not a valid instantiation of T with bound num.'.
+main() => new C<String>();
+"""
+    ],
+  },
+
+  'INVALID_USE_OF_SUPER': {
+    'id': 'JKYYSN',
+    'template': "'super' not allowed here.",
+  },
+
+  'INVALID_CASE_DEFAULT': {
+    'id': 'ABSPBM',
+    'template': "'default' only allowed on last case of a switch.",
+  },
+
+  'SWITCH_CASE_TYPES_NOT_EQUAL': {
+    'id': 'UFQPBC',
+    'template': "'case' expressions do not all have type '#{type}'.",
+  },
+
+  'SWITCH_CASE_TYPES_NOT_EQUAL_CASE': {
+    'id': 'RDMVAC',
+    'template': "'case' expression of type '#{type}'.",
+  },
+
+  'SWITCH_CASE_FORBIDDEN': {
+    'id': 'UHSCSU',
+    'template': "'case' expression may not be of type '#{type}'.",
+  },
+
+  'SWITCH_CASE_VALUE_OVERRIDES_EQUALS': {
+    'id': 'NRTWXL',
+    'template': "'case' expression type '#{type}' overrides 'operator =='.",
+  },
+
+  'INVALID_ARGUMENT_AFTER_NAMED': {
+    'id': 'WAJURC',
+    'template': "Unnamed argument after named argument.",
+  },
+
+  'NOT_A_COMPILE_TIME_CONSTANT': {
+    'id': 'SBCHWL',
+    'template': "Not a compile-time constant.",
+  },
+
+  'DEFERRED_COMPILE_TIME_CONSTANT': {
+    'id': 'FHXTCK',
+    'template': "A deferred value cannot be used as a compile-time constant.",
+  },
+
+  'DEFERRED_COMPILE_TIME_CONSTANT_CONSTRUCTION': {
+    'id': 'TSBXLG',
+    'template': "A deferred class cannot be used to create a "
+        "compile-time constant.",
+  },
+
+  'CYCLIC_COMPILE_TIME_CONSTANTS': {
+    'id': 'JJWJYE',
+    'template': "Cycle in the compile-time constant computation.",
+  },
+
+  'CONSTRUCTOR_IS_NOT_CONST': {
+    'id': 'DOJCUX',
+    'template': "Constructor is not a 'const' constructor.",
+  },
+
+  'CONST_MAP_KEY_OVERRIDES_EQUALS': {
+    'id': 'VJNWEL',
+    'template': "Const-map key type '#{type}' overrides 'operator =='.",
+  },
+
+  'NO_SUCH_LIBRARY_MEMBER': {
+    'id': 'IOXVBA',
+    'template': "'#{libraryName}' has no member named '#{memberName}'.",
+  },
+
+  'CANNOT_INSTANTIATE_TYPEDEF': {
+    'id': 'KOYNMU',
+    'template': "Cannot instantiate typedef '#{typedefName}'.",
+  },
+
+  'REQUIRED_PARAMETER_WITH_DEFAULT': {
+    'id': 'CJWECI',
+    'template': "Non-optional parameters can't have a default value.",
+    'howToFix':
+        "Try removing the default value or making the parameter optional.",
+    'examples': [
+      """
+main() {
+foo(a: 1) => print(a);
+foo(2);
+}""",
+      """
+main() {
+foo(a = 1) => print(a);
+foo(2);
+}"""
+    ],
+  },
+
+  'NAMED_PARAMETER_WITH_EQUALS': {
+    'id': 'RPJDXD',
+    'template': "Named optional parameters can't use '=' to specify a default "
+        "value.",
+    'howToFix': "Try replacing '=' with ':'.",
+    'examples': [
+      """
+main() {
+foo({a = 1}) => print(a);
+foo(a: 2);
+}"""
+    ],
+  },
+
+  'POSITIONAL_PARAMETER_WITH_EQUALS': {
+    'id': 'JMSSDX',
+    'template': "Positional optional parameters can't use ':' to specify a "
+        "default value.",
+    'howToFix': "Try replacing ':' with '='.",
+    'examples': [
+      """
+main() {
+foo([a: 1]) => print(a);
+foo(2);
+}"""
+    ],
+  },
+
+  'TYPEDEF_FORMAL_WITH_DEFAULT': {
+    'id': 'NABHHS',
+    'template': "A parameter of a typedef can't specify a default value.",
+    'howToFix': "Try removing the default value.",
+    'examples': [
+      """
+typedef void F([int arg = 0]);
+
+main() {
+F f;
+}""",
+      """
+typedef void F({int arg: 0});
+
+main() {
+F f;
+}"""
+    ],
+  },
+
+  'FUNCTION_TYPE_FORMAL_WITH_DEFAULT': {
+    'id': 'APKYLU',
+    'template': "A function type parameter can't specify a default value.",
+    'howToFix': "Try removing the default value.",
+    'examples': [
+      """
+foo(f(int i, [a = 1])) {}
+
+main() {
+foo(1, 2);
+}""",
+      """
+foo(f(int i, {a: 1})) {}
+
+main() {
+foo(1, a: 2);
+}"""
+    ],
+  },
+
+  'REDIRECTING_FACTORY_WITH_DEFAULT': {
+    'id': 'AWSSEY',
+    'template':
+        "A parameter of a redirecting factory constructor can't specify a "
+        "default value.",
+    'howToFix': "Try removing the default value.",
+    'examples': [
+      """
+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);
+}"""
+    ],
+  },
+
+  'FORMAL_DECLARED_CONST': {
+    'id': 'AVPRDK',
+    'template': "A formal parameter can't be declared const.",
+    'howToFix': "Try removing 'const'.",
+    'examples': [
+      """
+foo(const x) {}
+main() => foo(42);
+""",
+      """
+foo({const x}) {}
+main() => foo(42);
+""",
+      """
+foo([const x]) {}
+main() => foo(42);
+"""
+    ],
+  },
+
+  'FORMAL_DECLARED_STATIC': {
+    'id': 'PJKDMX',
+    'template': "A formal parameter can't be declared static.",
+    'howToFix': "Try removing 'static'.",
+    'examples': [
+      """
+foo(static x) {}
+main() => foo(42);
+""",
+      """
+foo({static x}) {}
+main() => foo(42);
+""",
+      """
+foo([static x]) {}
+main() => foo(42);
+"""
+    ],
+  },
+
+  'FINAL_FUNCTION_TYPE_PARAMETER': {
+    'id': 'JIOPIQ',
+    'template': "A function type parameter can't be declared final.",
+    'howToFix': "Try removing 'final'.",
+    'examples': [
+      """
+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);
+"""
+    ],
+  },
+
+  'VAR_FUNCTION_TYPE_PARAMETER': {
+    'id': 'FOQOHK',
+    'template': "A function type parameter can't be declared with 'var'.",
+    'howToFix': "Try removing 'var'.",
+    'examples': [
+      """
+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);
+"""
+    ],
+  },
+
+  'CANNOT_INSTANTIATE_TYPE_VARIABLE': {
+    'id': 'JAYHCH',
+    'template': "Cannot instantiate type variable '#{typeVariableName}'.",
+  },
+
+  'CYCLIC_TYPE_VARIABLE': {
+    'id': 'RQMPSO',
+    'template': "Type variable '#{typeVariableName}' is a supertype of itself.",
+  },
+
+  'CYCLIC_TYPEDEF': {
+    'id': 'VFERCQ',
+    'template': "A typedef can't refer to itself.",
+    'howToFix': "Try removing all references to '#{typedefName}' "
+        "in the definition of '#{typedefName}'.",
+    'examples': [
+      """
+typedef F F(); // The return type 'F' is a self-reference.
+main() { F f = null; }"""
+    ],
+  },
+
+  'CYCLIC_TYPEDEF_ONE': {
+    'id': 'ASWLWR',
+    'template': "A typedef can't refer to itself through another typedef.",
+    'howToFix': "Try removing all references to "
+        "'#{otherTypedefName}' in the definition of '#{typedefName}'.",
+    'examples': [
+      """
+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; }"""
+    ],
+  },
+
+  'CLASS_NAME_EXPECTED': {'id': 'DPKNHY', 'template': "Class name expected.",},
+
+  'CANNOT_EXTEND': {
+    'id': 'GCIQXD',
+    'template': "'#{type}' cannot be extended.",
+  },
+
+  'CANNOT_IMPLEMENT': {
+    'id': 'IBOQKV',
+    'template': "'#{type}' cannot be implemented.",
+  },
+
+  // TODO(johnnwinther): Split messages into reasons for malformedness.
+  'CANNOT_EXTEND_MALFORMED': {
+    'id': 'YPFJBD',
+    'template': "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': [
+      """
+class A extends Malformed {}
+main() => new A();"""
+    ],
+  },
+
+  'CANNOT_IMPLEMENT_MALFORMED': {
+    'id': 'XJUIAQ',
+    'template':
+        "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': [
+      """
+class A implements Malformed {}
+main() => new A();"""
+    ],
+  },
+
+  'CANNOT_MIXIN_MALFORMED': {
+    'id': 'SSMNXN',
+    'template': "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': [
+      """
+class A extends Object with Malformed {}
+main() => new A();"""
+    ],
+  },
+
+  'CANNOT_MIXIN': {
+    'id': 'KLSXDQ',
+    'template': "The type '#{type}' can't be mixed in.",
+    'howToFix': "Try removing '#{type}' from the 'with' clause.",
+    'examples': [
+      """
+class C extends Object with String {}
+
+main() => new C();
+""",
+      """
+typedef C = Object with String;
+
+main() => new C();
+"""
+    ],
+  },
+
+  'CANNOT_EXTEND_ENUM': {
+    'id': 'JEPRST',
+    'template':
+        "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': [
+      """
+enum Enum { A }
+class B extends Enum {}
+main() => new B();"""
+    ],
+  },
+
+  'CANNOT_IMPLEMENT_ENUM': {
+    'id': 'JMJMSH',
+    'template': "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': [
+      """
+enum Enum { A }
+class B implements Enum {}
+main() => new B();"""
+    ],
+  },
+
+  'CANNOT_MIXIN_ENUM': {
+    'id': 'YSYDIM',
+    'template':
+        "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': [
+      """
+enum Enum { A }
+class B extends Object with Enum {}
+main() => new B();"""
+    ],
+  },
+
+  'CANNOT_INSTANTIATE_ENUM': {
+    'id': 'CQYIFU',
+    'template': "Enum type '#{enumName}' cannot be instantiated.",
+    'howToFix': "Try making '#{enumType}' a normal class or use an enum "
+        "constant.",
+    'examples': [
+      """
+enum Enum { A }
+main() => new Enum(0);""",
+      """
+enum Enum { A }
+main() => const Enum(0);"""
+    ],
+  },
+
+  'EMPTY_ENUM_DECLARATION': {
+    'id': 'JFPDOH',
+    'template': "Enum '#{enumName}' must contain at least one value.",
+    'howToFix': "Try adding an enum constant or making #{enumName} a "
+        "normal class.",
+    'examples': [
+      """
+enum Enum {}
+main() { Enum e; }"""
+    ],
+  },
+
+  'MISSING_ENUM_CASES': {
+    'id': 'HHEOIW',
+    'template': "Missing enum constants in switch statement: #{enumValues}.",
+    'howToFix': "Try adding the missing constants or a default case.",
+    'examples': [
+      """
+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;
+}
+}"""
+    ],
+  },
+
+  'DUPLICATE_EXTENDS_IMPLEMENTS': {
+    'id': 'BKRKEO',
+    'template': "'#{type}' can not be both extended and implemented.",
+  },
+
+  'DUPLICATE_IMPLEMENTS': {
+    'id': 'IWJFTU',
+    'template': "'#{type}' must not occur more than once "
+        "in the implements clause.",
+  },
+
+  'MULTI_INHERITANCE': {
+    'id': 'NWXGOI',
+    'template':
+        "Dart2js does not currently support inheritance of the same class "
+        "with different type arguments: Both #{firstType} and #{secondType} "
+        "are supertypes of #{thisType}.",
+  },
+
+  'ILLEGAL_SUPER_SEND': {
+    'id': 'LDRGIU',
+    'template': "'#{name}' cannot be called on super.",
+  },
+
+  'NO_SUCH_SUPER_MEMBER': {
+    'id': 'HIJJVG',
+    'template':
+        "Cannot resolve '#{memberName}' in a superclass of '#{className}'.",
+  },
+
+  'ADDITIONAL_TYPE_ARGUMENT': {
+    'id': 'HWYHWH',
+    'template': "Additional type argument.",
+  },
+
+  'MISSING_TYPE_ARGUMENT': {
+    'id': 'KYTQWA',
+    'template': "Missing type argument.",
+  },
+
+  // TODO(johnniwinther): Use ADDITIONAL_TYPE_ARGUMENT or
+  // MISSING_TYPE_ARGUMENT instead.
+  'TYPE_ARGUMENT_COUNT_MISMATCH': {
+    'id': 'ECXGRM',
+    'template': "Incorrect number of type arguments on '#{type}'.",
+  },
+
+  'GETTER_MISMATCH': {
+    'id': 'MNODFW',
+    'template': "Setter disagrees on: '#{modifiers}'.",
+  },
+
+  'SETTER_MISMATCH': {
+    'id': 'FMNHPL',
+    'template': "Getter disagrees on: '#{modifiers}'.",
+  },
+
+  'ILLEGAL_SETTER_FORMALS': {
+    'id': 'COTPVN',
+    'template': "A setter must have exactly one argument.",
+  },
+
+  'NO_STATIC_OVERRIDE': {
+    'id': 'EHINXB',
+    'template':
+        "Static member cannot override instance member '#{memberName}' of "
+        "'#{className}'.",
+  },
+
+  'NO_STATIC_OVERRIDE_CONT': {
+    'id': 'TEVJMA',
+    'template': "This is the instance member that cannot be overridden "
+        "by a static member.",
+  },
+
+  'INSTANCE_STATIC_SAME_NAME': {
+    'id': 'LTBFBO',
+    'template': "Instance member '#{memberName}' and static member of "
+        "superclass '#{className}' have the same name.",
+  },
+
+  'INSTANCE_STATIC_SAME_NAME_CONT': {
+    'id': 'CHSUCQ',
+    'template': "This is the static member with the same name.",
+  },
+
+  'INVALID_OVERRIDE_METHOD': {
+    'id': 'NINKPI',
+    'template': "The type '#{declaredType}' of method '#{name}' declared in "
+        "'#{class}' is not a subtype of the overridden method type "
+        "'#{inheritedType}' inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDDEN_METHOD': {
+    'id': 'BQHUPY',
+    'template': "This is the overridden method '#{name}' declared in class "
+        "'#{class}'.",
+  },
+
+  'INVALID_OVERRIDE_GETTER': {
+    'id': 'KLMPWO',
+    'template': "The type '#{declaredType}' of getter '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden getter inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDDEN_GETTER': {
+    'id': 'ASSKCT',
+    'template': "This is the overridden getter '#{name}' declared in class "
+        "'#{class}'.",
+  },
+
+  'INVALID_OVERRIDE_GETTER_WITH_FIELD': {
+    'id': 'TCCGXU',
+    'template': "The type '#{declaredType}' of field '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden getter inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDE_FIELD_WITH_GETTER': {
+    'id': 'UMMEXO',
+    'template': "The type '#{declaredType}' of getter '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden field inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDE_SETTER': {
+    'id': 'BWRGEC',
+    'template': "The type '#{declaredType}' of setter '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden setter inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDDEN_SETTER': {
+    'id': 'XQUOLL',
+    'template': "This is the overridden setter '#{name}' declared in class "
+        "'#{class}'.",
+  },
+
+  'INVALID_OVERRIDE_SETTER_WITH_FIELD': {
+    'id': 'GKGOFA',
+    'template': "The type '#{declaredType}' of field '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden setter inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDE_FIELD_WITH_SETTER': {
+    'id': 'OOXKHQ',
+    'template': "The type '#{declaredType}' of setter '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden field inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDE_FIELD': {
+    'id': 'LDPKOL',
+    'template': "The type '#{declaredType}' of field '#{name}' declared in "
+        "'#{class}' is not assignable to the type '#{inheritedType}' of the "
+        "overridden field inherited from '#{inheritedClass}'.",
+  },
+
+  'INVALID_OVERRIDDEN_FIELD': {
+    'id': 'UNQFWX',
+    'template': "This is the overridden field '#{name}' declared in class "
+        "'#{class}'.",
+  },
+
+  'CANNOT_OVERRIDE_FIELD_WITH_METHOD': {
+    'id': 'SYKCSK',
+    'template': "Method '#{name}' in '#{class}' can't override field from "
+        "'#{inheritedClass}'.",
+  },
+
+  'CANNOT_OVERRIDE_FIELD_WITH_METHOD_CONT': {
+    'id': 'HYHQSO',
+    'template': "This is the field that cannot be overridden by a method.",
+  },
+
+  'CANNOT_OVERRIDE_METHOD_WITH_FIELD': {
+    'id': 'UROMAS',
+    'template': "Field '#{name}' in '#{class}' can't override method from "
+        "'#{inheritedClass}'.",
+  },
+
+  'CANNOT_OVERRIDE_METHOD_WITH_FIELD_CONT': {
+    'id': 'NSORYS',
+    'template': "This is the method that cannot be overridden by a field.",
+  },
+
+  'CANNOT_OVERRIDE_GETTER_WITH_METHOD': {
+    'id': 'MMFIOH',
+    'template': "Method '#{name}' in '#{class}' can't override getter from "
+        "'#{inheritedClass}'.",
+  },
+
+  'CANNOT_OVERRIDE_GETTER_WITH_METHOD_CONT': {
+    'id': 'YGWPDH',
+    'template': "This is the getter that cannot be overridden by a method.",
+  },
+
+  'CANNOT_OVERRIDE_METHOD_WITH_GETTER': {
+    'id': 'BNKNXO',
+    'template': "Getter '#{name}' in '#{class}' can't override method from "
+        "'#{inheritedClass}'.",
+  },
+
+  'CANNOT_OVERRIDE_METHOD_WITH_GETTER_CONT': {
+    'id': 'KFBCYX',
+    'template': "This is the method that cannot be overridden by a getter.",
+  },
+
+  'MISSING_FORMALS': {
+    'id': 'BOERAF',
+    'template': "Formal parameters are missing.",
+  },
+
+  'EXTRA_FORMALS': {
+    'id': 'UTWRIU',
+    'template': "Formal parameters are not allowed here.",
+  },
+
+  'UNARY_OPERATOR_BAD_ARITY': {
+    'id': 'TNHLAL',
+    'template': "Operator '#{operatorName}' must have no parameters.",
+  },
+
+  'MINUS_OPERATOR_BAD_ARITY': {
+    'id': 'SXDRRU',
+    'template': "Operator '-' must have 0 or 1 parameters.",
+  },
+
+  'BINARY_OPERATOR_BAD_ARITY': {
+    'id': 'QKWAUM',
+    'template': "Operator '#{operatorName}' must have exactly 1 parameter.",
+  },
+
+  'TERNARY_OPERATOR_BAD_ARITY': {
+    'id': 'LSMQGF',
+    'template': "Operator '#{operatorName}' must have exactly 2 parameters.",
+  },
+
+  'OPERATOR_OPTIONAL_PARAMETERS': {
+    'id': 'HSGRBV',
+    'template': "Operator '#{operatorName}' cannot have optional parameters.",
+  },
+
+  'OPERATOR_NAMED_PARAMETERS': {
+    'id': 'EACWGS',
+    'template': "Operator '#{operatorName}' cannot have named parameters.",
+  },
+
+  'CONSTRUCTOR_WITH_RETURN_TYPE': {
+    'id': 'OPMBHF',
+    'template': "Cannot have return type for constructor.",
+  },
+
+  'CANNOT_RETURN_FROM_CONSTRUCTOR': {
+    'id': 'NFUGNH',
+    'template': "Constructors can't return values.",
+    'howToFix': "Remove the return statement or use a factory constructor.",
+    'examples': [
+      """
+class C {
+C() {
+  return 1;
+}
+}
+
+main() => new C();"""
+    ],
+  },
+
+  'ILLEGAL_FINAL_METHOD_MODIFIER': {
+    'id': 'YUKCVU',
+    'template': "Cannot have final modifier on method.",
+  },
+
+  'ILLEGAL_CONST_FIELD_MODIFIER': {
+    'id': 'JGFAGV',
+    'template': "Cannot have const modifier on non-static field.",
+    'howToFix': "Try adding a static modifier, or removing the const modifier.",
+    'examples': [
+      """
+class C {
+const int a = 1;
+}
+
+main() => new C();"""
+    ],
+  },
+
+  'ILLEGAL_CONSTRUCTOR_MODIFIERS': {
+    'id': 'WODRHN',
+    'template': "Illegal constructor modifiers: '#{modifiers}'.",
+  },
+
+  'ILLEGAL_MIXIN_APPLICATION_MODIFIERS': {
+    'id': 'OFLFHN',
+    'template': "Illegal mixin application modifiers: '#{modifiers}'.",
+  },
+
+  'ILLEGAL_MIXIN_SUPERCLASS': {
+    'id': 'TPVVYN',
+    'template': "Class used as mixin must have Object as superclass.",
+  },
+
+  'ILLEGAL_MIXIN_OBJECT': {
+    'id': 'CMVTLF',
+    'template': "Cannot use Object as mixin.",
+  },
+
+  'ILLEGAL_MIXIN_CONSTRUCTOR': {
+    'id': 'HXBUIB',
+    'template': "Class used as mixin cannot have non-factory constructor.",
+  },
+
+  'ILLEGAL_MIXIN_CYCLE': {
+    'id': 'ANXAMU',
+    'template': "Class used as mixin introduces mixin cycle: "
+        "'#{mixinName1}' <-> '#{mixinName2}'.",
+  },
+
+  'ILLEGAL_MIXIN_WITH_SUPER': {
+    'id': 'KIEUGK',
+    'template': "Cannot use class '#{className}' as a mixin because it uses "
+        "'super'.",
+  },
+
+  'ILLEGAL_MIXIN_SUPER_USE': {
+    'id': 'QKUPLH',
+    'template': "Use of 'super' in class used as mixin.",
+  },
+
+  'PARAMETER_NAME_EXPECTED': {
+    'id': 'JOUOBT',
+    'template': "parameter name expected.",
+  },
+
+  'CANNOT_RESOLVE_GETTER': {
+    'id': 'TDHKSW',
+    'template': "Cannot resolve getter.",
+  },
+
+  'CANNOT_RESOLVE_SETTER': {
+    'id': 'QQFANP',
+    'template': "Cannot resolve setter.",
+  },
+
+  'ASSIGNING_FINAL_FIELD_IN_SUPER': {
+    'id': 'LXUPCC',
+    'template': "Cannot assign a value to final field '#{name}' "
+        "in superclass '#{superclassName}'.",
+  },
+
+  'ASSIGNING_METHOD': {
+    'id': 'JUVMYC',
+    'template': "Cannot assign a value to a method.",
+  },
+
+  'ASSIGNING_METHOD_IN_SUPER': {
+    'id': 'AGMAXN',
+    'template': "Cannot assign a value to method '#{name}' "
+        "in superclass '#{superclassName}'.",
+  },
+
+  'ASSIGNING_TYPE': {
+    'id': 'VXTPWE',
+    'template': "Cannot assign a value to a type.",
+  },
+
+  'IF_NULL_ASSIGNING_TYPE': {
+    'id': 'XBRHGK',
+    'template':
+        "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': ["class A {} main() { print(A ??= 3);}",],
+  },
+
+  'VOID_NOT_ALLOWED': {
+    'id': 'DMMDXT',
+    'template':
+        "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': ["void x; main() {}", "foo(void x) {} main() { foo(null); }",],
+  },
+
+  'NULL_NOT_ALLOWED': {
+    'id': 'STYNSK',
+    'template': "`null` can't be used here.",
+  },
+
+  'BEFORE_TOP_LEVEL': {
+    'id': 'GRCXQF',
+    'template': "Part header must come before top-level definitions.",
+  },
+
+  'IMPORT_PART_OF': {
+    'id': 'VANCWE',
+    'template': "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': [
+      {
+        'main.dart': """
+library library;
+
+import 'part.dart';
+
+main() {}
+""",
+        'part.dart': """
+part of library;
+"""
+      }
+    ],
+  },
+
+  'LIBRARY_NAME_MISMATCH': {
+    'id': 'AXGYPQ',
+    'template': "Expected part of library name '#{libraryName}'.",
+    'howToFix': "Try changing the directive to 'part of #{libraryName};'.",
+    'examples': [
+      {
+        'main.dart': """
+library lib.foo;
+
+part 'part.dart';
+
+main() {}
+""",
+        'part.dart': """
+part of lib.bar;
+"""
+      }
+    ],
+  },
+
+  'MISSING_LIBRARY_NAME': {
+    'id': 'NYQNCA',
+    'template': "Library has no name. Part directive expected library name "
+        "to be '#{libraryName}'.",
+    'howToFix': "Try adding 'library #{libraryName};' to the library.",
+    'examples': [
+      {
+        'main.dart': """
+part 'part.dart';
+
+main() {}
+""",
+        'part.dart': """
+part of lib.foo;
+"""
+      }
+    ],
+  },
+
+  'THIS_IS_THE_PART_OF_TAG': {
+    'id': 'RPSJRS',
+    'template': "This is the part of directive.",
+  },
+
+  'MISSING_PART_OF_TAG': {
+    'id': 'QNYCMV',
+    'template': "This file has no part-of tag, but it is being used as a part.",
+  },
+
+  'DUPLICATED_PART_OF': {
+    'id': 'UJDYHF',
+    'template': "Duplicated part-of directive.",
+  },
+
+  'DUPLICATED_LIBRARY_NAME': {
+    'id': 'OSEHXI',
+    'template': "Duplicated library name '#{libraryName}'.",
+  },
+
+  'DUPLICATED_RESOURCE': {
+    'id': 'UFWKBY',
+    'template': "The resource '#{resourceUri}' is loaded through both "
+        "'#{canonicalUri1}' and '#{canonicalUri2}'.",
+  },
+
+  'DUPLICATED_LIBRARY_RESOURCE': {
+    'id': 'KYGYTT',
+    'template':
+        "The library '#{libraryName}' in '#{resourceUri}' is loaded through "
+        "both '#{canonicalUri1}' and '#{canonicalUri2}'.",
+  },
+
+  // This is used as an exception.
+  'INVALID_SOURCE_FILE_LOCATION': {
+    'id': 'WIGJFG',
+    'template': """
+Invalid offset (#{offset}) in source map.
+File: #{fileName}
+Length: #{length}""",
+  },
+
+  'TOP_LEVEL_VARIABLE_DECLARED_STATIC': {
+    'id': 'IVNDML',
+    'template': "Top-level variable cannot be declared static.",
+  },
+
+  'REFERENCE_IN_INITIALIZATION': {
+    'id': 'OVWTEU',
+    'template': "Variable '#{variableName}' is referenced during its "
+        "initialization.",
+    'howToFix': "If you are trying to reference a shadowed variable, rename "
+        "one of the variables.",
+    'examples': [
+      """
+foo(t) {
+var t = t;
+return t;
+}
+
+main() => foo(1);
+"""
+    ],
+  },
+
+  'CONST_WITHOUT_INITIALIZER': {
+    'id': 'UDWCNH',
+    'template': "A constant variable must be initialized.",
+    'howToFix': "Try adding an initializer or "
+        "removing the 'const' modifier.",
+    'examples': [
+      """
+void main() {
+const c; // This constant variable must be initialized.
+}"""
+    ],
+  },
+
+  'FINAL_WITHOUT_INITIALIZER': {
+    'id': 'YMESFI',
+    'template': "A final variable must be initialized.",
+    'howToFix': "Try adding an initializer or "
+        "removing the 'final' modifier.",
+    'examples': ["class C { static final field; } main() => C.field;"],
+  },
+
+  'MEMBER_USES_CLASS_NAME': {
+    'id': 'TVFYRK',
+    'template': "Member variable can't have the same name as the class it is "
+        "declared in.",
+    'howToFix': "Try renaming the variable.",
+    'examples': [
+      """
+class A { var A; }
+main() {
+var a = new A();
+a.A = 1;
+}
+""",
+      """
+class A { static var A; }
+main() => A.A = 1;
+"""
+    ],
+  },
+
+  'WRONG_NUMBER_OF_ARGUMENTS_FOR_ASSERT': {
+    'id': 'IXYNUF',
+    'template': "Wrong number of arguments to assert. Should be 1, but given "
+        "#{argumentCount}.",
+  },
+
+  'ASSERT_IS_GIVEN_NAMED_ARGUMENTS': {
+    'id': 'EJFDTO',
+    'template':
+        "'assert' takes no named arguments, but given #{argumentCount}.",
+  },
+
+  'FACTORY_REDIRECTION_IN_NON_FACTORY': {
+    'id': 'DTBWEX',
+    'template': "Factory redirection only allowed in factories.",
+  },
+
+  'MISSING_FACTORY_KEYWORD': {
+    'id': 'HOQYYA',
+    'template': "Did you forget a factory keyword here?",
+  },
+
+  'NO_SUCH_METHOD_IN_NATIVE': {
+    'id': 'MSDDBX',
+    'template':
+        "'NoSuchMethod' is not supported for classes that extend native "
+        "classes.",
+  },
+
+  'DEFERRED_LIBRARY_DART_2_DART': {
+    'id': 'RIRQAH',
+    'template': "Deferred loading is not supported by the dart backend yet. "
+        "The output will not be split.",
+  },
+
+  'DEFERRED_LIBRARY_WITHOUT_PREFIX': {
+    'id': 'CARRII',
+    'template': "This import is deferred but there is no prefix keyword.",
+    'howToFix': "Try adding a prefix to the import."
+  },
+
+  'DEFERRED_OLD_SYNTAX': {
+    'id': 'QCBRAE',
+    'template': "The DeferredLibrary annotation is obsolete.",
+    'howToFix':
+        "Use the \"import 'lib.dart' deferred as prefix\" syntax instead.",
+  },
+
+  'DEFERRED_LIBRARY_DUPLICATE_PREFIX': {
+    'id': 'BBMJTD',
+    'template': "The prefix of this deferred import is not unique.",
+    'howToFix': "Try changing the import prefix."
+  },
+
+  'DEFERRED_TYPE_ANNOTATION': {
+    'id': 'JOUEFD',
+    'template': "The type #{node} is deferred. "
+        "Deferred types are not valid as type annotations.",
+    'howToFix': "Try using a non-deferred abstract class as an interface.",
+  },
+
+  'ILLEGAL_STATIC': {
+    'id': 'HFBHVE',
+    'template': "Modifier static is only allowed on functions declared in "
+        "a class.",
+  },
+
+  'STATIC_FUNCTION_BLOAT': {
+    'id': 'SJHTKF',
+    'template': "Using '#{class}.#{name}' may lead to unnecessarily large "
+        "generated code.",
+    'howToFix': "Try adding '@MirrorsUsed(...)' as described at "
+        "https://goo.gl/Akrrog.",
+  },
+
+  'NON_CONST_BLOAT': {
+    'id': 'RDRSHO',
+    'template': "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.",
+  },
+
+  'STRING_EXPECTED': {
+    'id': 'OEJOOI',
+    'template': "Expected a 'String', but got an instance of '#{type}'.",
+  },
+
+  'PRIVATE_IDENTIFIER': {
+    'id': 'XAHVWI',
+    'template': "'#{value}' is not a valid Symbol name because it starts with "
+        "'_'.",
+  },
+
+  'PRIVATE_NAMED_PARAMETER': {
+    'id': 'VFGCLK',
+    'template': "Named optional parameter can't have a library private name.",
+    'howToFix': "Try removing the '_' or making the parameter positional or "
+        "required.",
+    'examples': ["""foo({int _p}) {} main() => foo();"""],
+  },
+
+  'UNSUPPORTED_LITERAL_SYMBOL': {
+    'id': 'OYCDII',
+    'template':
+        "Symbol literal '##{value}' is currently unsupported by dart2js.",
+  },
+
+  'INVALID_SYMBOL': {
+    'id': 'RUXMBL',
+    'template': '''
+'#{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.",
+  },
+
+  'AMBIGUOUS_REEXPORT': {
+    'id': 'YNTOND',
+    'template': "'#{name}' is (re)exported by multiple libraries.",
+  },
+
+  'AMBIGUOUS_LOCATION': {
+    'id': 'SKLTYA',
+    'template': "'#{name}' is defined here.",
+  },
+
+  'IMPORTED_HERE': {'id': 'IMUXAE', 'template': "'#{name}' is imported here.",},
+
+  'OVERRIDE_EQUALS_NOT_HASH_CODE': {
+    'id': 'MUHYXI',
+    'template': "The class '#{class}' overrides 'operator==', "
+        "but not 'get hashCode'.",
+  },
+
+  'INTERNAL_LIBRARY_FROM': {
+    'id': 'RXOCLX',
+    'template': "Internal library '#{resolvedUri}' is not accessible from "
+        "'#{importingUri}'.",
+  },
+
+  'INTERNAL_LIBRARY': {
+    'id': 'SYLJAV',
+    'template': "Internal library '#{resolvedUri}' is not accessible.",
+  },
+
+  'JS_INTEROP_CLASS_CANNOT_EXTEND_DART_CLASS': {
+    'id': 'LSHKJK',
+    'template':
+        "Js-interop class '#{cls}' cannot extend from the non js-interop "
+        "class '#{superclass}'.",
+    'howToFix': "Annotate the superclass with @JS.",
+    'examples': [
+      """
+            import 'package:js/js.dart';
+
+            class Foo { }
+
+            @JS()
+            class Bar extends Foo { }
+
+            main() {
+              new Bar();
+            }
+            """
+    ],
+  },
+
+  'JS_INTEROP_CLASS_NON_EXTERNAL_MEMBER': {
+    'id': 'QLLLEE',
+    'template':
+        "Member '#{member}' in js-interop class '#{cls}' is not external.",
+    'howToFix': "Mark all interop methods external",
+    'examples': [
+      """
+            import 'package:js/js.dart';
+
+            @JS()
+            class Foo {
+              bar() {}
+            }
+
+            main() {
+              new Foo().bar();
+            }
+            """
+    ],
+  },
+
+  'JS_INTEROP_METHOD_WITH_NAMED_ARGUMENTS': {
+    'id': 'TDQHRY',
+    'template': "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': [
+      """
+            import 'package:js/js.dart';
+
+            @JS()
+            class Foo {
+              external bar(foo, {baz});
+            }
+
+            main() {
+              new Foo().bar(4, baz: 5);
+            }
+            """
+    ],
+  },
+
+  'JS_OBJECT_LITERAL_CONSTRUCTOR_WITH_POSITIONAL_ARGUMENTS': {
+    'id': 'EHEKUY',
+    'template':
+        "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': [
+      """
+            import 'package:js/js.dart';
+
+            @anonymous
+            @JS()
+            class Foo {
+              external factory Foo(foo, {baz});
+            }
+
+            main() {
+              new Foo(5, baz: 5);
+            }
+            """
+    ],
+  },
+
+  'LIBRARY_NOT_FOUND': {
+    'id': 'BARPSL',
+    'template': "Library not found '#{resolvedUri}'.",
+  },
+
+  'LIBRARY_NOT_SUPPORTED': {
+    'id': 'GDXUNS',
+    'template': "Library not supported '#{resolvedUri}'.",
+    'howToFix': "Try removing the dependency or enabling support using "
+        "the '--categories' option.",
+    'examples': [
+//            """
+//            import 'dart:io';
+//            main() {}
+//            """
+    ],
+    // TODO(johnniwinther): Enable example when message_kind_test.dart
+    // supports library loader callbacks.
+  },
+
+  'UNSUPPORTED_EQ_EQ_EQ': {
+    'id': 'GPOVNO',
+    'template': "'===' is not an operator. "
+        "Did you mean '#{lhs} == #{rhs}' or 'identical(#{lhs}, #{rhs})'?",
+  },
+
+  'UNSUPPORTED_BANG_EQ_EQ': {
+    'id': 'HDYKMV',
+    'template': "'!==' is not an operator. "
+        "Did you mean '#{lhs} != #{rhs}' or '!identical(#{lhs}, #{rhs})'?",
+  },
+
+  'UNSUPPORTED_PREFIX_PLUS': {
+    'id': 'LSQTHP',
+    'template': "'+' is not a prefix operator. ",
+    'howToFix': "Try removing '+'.",
+    'examples': ["main() => +2;  // No longer a valid way to write '2'"],
+  },
+
+  'UNSUPPORTED_THROW_WITHOUT_EXP': {
+    'id': 'QOAKGE',
+    'template': "No expression after 'throw'. "
+        "Did you mean 'rethrow'?",
+  },
+
+  'DEPRECATED_TYPEDEF_MIXIN_SYNTAX': {
+    'id': 'BBGGFE',
+    'template': "'typedef' not allowed here. ",
+    'howToFix': "Try replacing 'typedef' with 'class'.",
+    'examples': [
+      """
+class B { }
+class M1 {  }
+typedef C = B with M1;  // Need to replace 'typedef' with 'class'.
+main() { new C(); }
+"""
+    ],
+  },
+
+  'MIRRORS_EXPECTED_STRING': {
+    'id': 'XSKTIB',
+    'template':
+        "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': [
+      """
+// 'Foo' is a type literal, not a string.
+@MirrorsUsed(symbols: const [Foo])
+import 'dart:mirrors';
+
+class Foo {}
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_EXPECTED_STRING_OR_TYPE': {
+    'id': 'JQDJPL',
+    'template':
+        "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': [
+      """
+// 'main' is a method, not a class.
+@MirrorsUsed(targets: const [main])
+import 'dart:mirrors';
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_EXPECTED_STRING_OR_LIST': {
+    'id': 'UVYCOE',
+    'template':
+        "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': [
+      """
+// 'Foo' is not a string.
+@MirrorsUsed(symbols: Foo)
+import 'dart:mirrors';
+
+class Foo {}
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_EXPECTED_STRING_TYPE_OR_LIST': {
+    'id': 'WSYDFL',
+    'template':
+        "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': [
+      """
+// '1' is not a string.
+@MirrorsUsed(targets: 1)
+import 'dart:mirrors';
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_CANNOT_RESOLVE_IN_CURRENT_LIBRARY': {
+    'id': 'VDBBNE',
+    'template': "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': [
+      """
+// 'window' is not in scope because dart:html isn't imported.
+@MirrorsUsed(targets: 'window')
+import 'dart:mirrors';
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_CANNOT_RESOLVE_IN_LIBRARY': {
+    'id': 'RUEKXE',
+    'template': "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': [
+      """
+// 'List' is misspelled.
+@MirrorsUsed(targets: 'dart.core.Lsit')
+import 'dart:mirrors';
+
+main() {}
+"""
+    ],
+  },
+
+  'MIRRORS_CANNOT_FIND_IN_ELEMENT': {
+    'id': 'ACPDCS',
+    'template': "Can't find '#{name}' in '#{element}'.",
+    // TODO(ahe): The closest identifiers in edit distance would be nice.
+    'howToFix': "Is '#{name}' spelled right?",
+    'examples': [
+      """
+// 'addAll' is misspelled.
+@MirrorsUsed(targets: 'dart.core.List.addAl')
+import 'dart:mirrors';
+
+main() {}
+"""
+    ],
+  },
+
+  'INVALID_URI': {
+    'id': 'QQEQMK',
+    'template': "'#{uri}' is not a valid URI.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+// can't have a '[' in a URI
+import '../../Udyn[mic ils/expect.dart';
+
+main() {}
+"""
+    ],
+  },
+
+  'INVALID_PACKAGE_CONFIG': {
+    'id': 'XKFAJO',
+    'template': """Package config file '#{uri}' is invalid.
+#{exception}""",
+    'howToFix': DONT_KNOW_HOW_TO_FIX
+  },
+
+  'INVALID_PACKAGE_URI': {
+    'id': 'MFVNNJ',
+    'template': "'#{uri}' is not a valid package URI (#{exception}).",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+// 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() {}
+"""
+    ],
+  },
+
+  'READ_SCRIPT_ERROR': {
+    'id': 'JDDYLH',
+    'template': "Can't read '#{uri}' (#{exception}).",
+    // Don't know how to fix since the underlying error is unknown.
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+// 'foo.dart' does not exist.
+import 'foo.dart';
+
+main() {}
+"""
+    ],
+  },
+
+  'READ_SELF_ERROR': {
+    'id': 'CRJUAV',
+    'template': "#{exception}",
+    // Don't know how to fix since the underlying error is unknown.
+    'howToFix': DONT_KNOW_HOW_TO_FIX
+  },
+
+  'EXTRANEOUS_MODIFIER': {
+    'id': 'DPLVJG',
+    'template': "Can't have modifier '#{modifier}' here.",
+    'howToFix': "Try removing '#{modifier}'.",
+    'examples': [
+      "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(){}"
+    ],
+  },
+
+  'EXTRANEOUS_MODIFIER_REPLACE': {
+    'id': 'SSXDLN',
+    'template': "Can't have modifier '#{modifier}' here.",
+    'howToFix': "Try replacing modifier '#{modifier}' with 'var', 'final', "
+        "or a type.",
+    'examples': [
+      // "get foo; main(){}",
+      "set foo; main(){}",
+      "abstract foo; main(){}",
+      "static foo; main(){}",
+      "external foo; main(){}"
+    ],
+  },
+
+  'ABSTRACT_CLASS_INSTANTIATION': {
+    'id': 'KOBCRO',
+    'template': "Can't instantiate abstract class.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': ["abstract class A {} main() { new A(); }"],
+  },
+
+  'BODY_EXPECTED': {
+    'id': 'YXCAHO',
+    'template': "Expected a function body or '=>'.",
+    // TODO(ahe): In some scenarios, we can suggest removing the 'static'
+    // keyword.
+    'howToFix': "Try adding {}.",
+    'examples': ["main();"],
+  },
+
+  'MIRROR_BLOAT': {
+    'id': 'BSEAIT',
+    'template':
+        "#{count} methods retained for use by dart:mirrors out of #{total}"
+        " total methods (#{percentage}%).",
+  },
+
+  'MIRROR_IMPORT': {'id': 'BDAETE', 'template': "Import of 'dart:mirrors'.",},
+
+  'MIRROR_IMPORT_NO_USAGE': {
+    'id': 'OJOHTR',
+    'template':
+        "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.",
+  },
+
+  'JS_PLACEHOLDER_CAPTURE': {
+    'id': 'EJXEGQ',
+    'template': "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.",
+  },
+
+  'WRONG_ARGUMENT_FOR_JS_INTERCEPTOR_CONSTANT': {
+    'id': 'JHRISO',
+    'template':
+        "Argument for 'JS_INTERCEPTOR_CONSTANT' must be a type constant.",
+  },
+
+  'EXPECTED_IDENTIFIER_NOT_RESERVED_WORD': {
+    'id': 'FEJXJF',
+    'template': "'#{keyword}' is a reserved word and can't be used here.",
+    'howToFix': "Try using a different name.",
+    'examples': ["do() {} main() {}"],
+  },
+
+  'NAMED_FUNCTION_EXPRESSION': {
+    'id': 'CTHFPI',
+    'template': "Function expression '#{name}' cannot be named.",
+    'howToFix': "Try removing the name.",
+    'examples': ["main() { var f = func() {}; }"],
+  },
+
+  'UNUSED_METHOD': {
+    'id': 'PKLRQL',
+    'template': "The method '#{name}' is never called.",
+    'howToFix': "Consider deleting it.",
+    'examples': ["deadCode() {} main() {}"],
+  },
+
+  'UNUSED_CLASS': {
+    'id': 'TBIECC',
+    'template': "The class '#{name}' is never used.",
+    'howToFix': "Consider deleting it.",
+    'examples': ["class DeadCode {} main() {}"],
+  },
+
+  'UNUSED_TYPEDEF': {
+    'id': 'JBIPCN',
+    'template': "The typedef '#{name}' is never used.",
+    'howToFix': "Consider deleting it.",
+    'examples': ["typedef DeadCode(); main() {}"],
+  },
+
+  'ABSTRACT_METHOD': {
+    'id': 'HOKOBG',
+    'template': "The method '#{name}' has no implementation in "
+        "class '#{class}'.",
+    'howToFix': "Try adding a body to '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+class Class {
+method();
+}
+main() => new Class().method();
+"""
+    ],
+  },
+
+  'ABSTRACT_GETTER': {
+    'id': 'VKTRNK',
+    'template': "The getter '#{name}' has no implementation in "
+        "class '#{class}'.",
+    'howToFix': "Try adding a body to '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+class Class {
+get getter;
+}
+main() => new Class();
+"""
+    ],
+  },
+
+  'ABSTRACT_SETTER': {
+    'id': 'XGDGKK',
+    'template': "The setter '#{name}' has no implementation in "
+        "class '#{class}'.",
+    'howToFix': "Try adding a body to '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+class Class {
+set setter(_);
+}
+main() => new Class();
+"""
+    ],
+  },
+
+  'INHERIT_GETTER_AND_METHOD': {
+    'id': 'UMEUEG',
+    'template': "The class '#{class}' can't inherit both getters and methods "
+        "by the named '#{name}'.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+class A {
+get member => null;
+}
+class B {
+member() {}
+}
+class Class implements A, B {
+}
+main() => new Class();
+"""
+    ],
+  },
+
+  'INHERITED_METHOD': {
+    'id': 'GMSVBM',
+    'template': "The inherited method '#{name}' is declared here in class "
+        "'#{class}'.",
+  },
+
+  'INHERITED_EXPLICIT_GETTER': {
+    'id': 'KKAVRS',
+    'template': "The inherited getter '#{name}' is declared here in class "
+        "'#{class}'.",
+  },
+
+  'INHERITED_IMPLICIT_GETTER': {
+    'id': 'JBAMEJ',
+    'template': "The inherited getter '#{name}' is implicitly declared by this "
+        "field in class '#{class}'.",
+  },
+
+  'UNIMPLEMENTED_METHOD_ONE': {
+    'id': 'CMCLWO',
+    'template': "'#{class}' doesn't implement '#{method}' "
+        "declared in '#{declarer}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+abstract class I {
+m();
+}
+class C implements I {}
+main() => new C();
+""",
+      """
+abstract class I {
+m();
+}
+class C extends I {}
+main() => new C();
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_METHOD': {
+    'id': 'IJSNQB',
+    'template': "'#{class}' doesn't implement '#{method}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+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();
+}
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_METHOD_CONT': {
+    'id': 'KFBKPO',
+    'template': "The method '#{name}' is declared here in class '#{class}'.",
+  },
+
+  'UNIMPLEMENTED_SETTER_ONE': {
+    'id': 'QGKTEA',
+    'template': "'#{class}' doesn't implement the setter '#{name}' "
+        "declared in '#{declarer}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+abstract class I {
+set m(_);
+}
+class C implements I {}
+class D implements I {
+set m(_) {}
+}
+main() {
+new D().m = 0;
+new C();
+}
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_SETTER': {
+    'id': 'VEEGJQ',
+    'template': "'#{class}' doesn't implement the setter '#{name}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+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();
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_EXPLICIT_SETTER': {
+    'id': 'SABABA',
+    'template': "The setter '#{name}' is declared here in class '#{class}'.",
+  },
+
+  'UNIMPLEMENTED_IMPLICIT_SETTER': {
+    'id': 'SWESAQ',
+    'template': "The setter '#{name}' is implicitly declared by this field "
+        "in class '#{class}'.",
+  },
+
+  'UNIMPLEMENTED_GETTER_ONE': {
+    'id': 'ODEPFW',
+    'template': "'#{class}' doesn't implement the getter '#{name}' "
+        "declared in '#{declarer}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+abstract class I {
+get m;
+}
+class C implements I {}
+main() => new C();
+""",
+      """
+abstract class I {
+get m;
+}
+class C extends I {}
+main() => new C();
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_GETTER': {
+    'id': 'VHSECG',
+    'template': "'#{class}' doesn't implement the getter '#{name}'.",
+    'howToFix': "Try adding an implementation of '#{name}' or declaring "
+        "'#{class}' to be 'abstract'.",
+    'examples': [
+      """
+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();
+"""
+    ],
+  },
+
+  'UNIMPLEMENTED_EXPLICIT_GETTER': {
+    'id': 'HFDJPP',
+    'template': "The getter '#{name}' is declared here in class '#{class}'.",
+  },
+
+  'UNIMPLEMENTED_IMPLICIT_GETTER': {
+    'id': 'BSCQNO',
+    'template': "The getter '#{name}' is implicitly declared by this field "
+        "in class '#{class}'.",
+  },
+
+  'EQUAL_MAP_ENTRY_KEY': {
+    'id': 'KIDLPM',
+    'template': "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': [
+      """
+main() {
+var m = const {'foo': 1, 'foo': 2};
+}"""
+    ],
+  },
+
+  'BAD_INPUT_CHARACTER': {
+    'id': 'SHQWJY',
+    'template': "Character U+#{characterHex} isn't allowed here.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+main() {
+String x = ç;
+}
+"""
+    ],
+  },
+
+  'UNTERMINATED_STRING': {
+    'id': 'TRLTHK',
+    'template': "String must end with #{quote}.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      """
+main() {
+return '
+;
+}
+""",
+      """
+main() {
+return \"
+;
+}
+""",
+      """
+main() {
+return r'
+;
+}
+""",
+      """
+main() {
+return r\"
+;
+}
+""",
+      """
+main() => '''
+""",
+      """
+main() => \"\"\"
+""",
+      """
+main() => r'''
+""",
+      """
+main() => r\"\"\"
+"""
+    ],
+  },
+
+  'UNMATCHED_TOKEN': {
+    'id': 'AGJKMQ',
+    'template': "Can't find '#{end}' to match '#{begin}'.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': ["main(", "main(){", "main(){]}",],
+  },
+
+  'UNTERMINATED_TOKEN': {
+    'id': 'VIIXHQ',
+    'template':
+        // This is a fall-back message that shouldn't happen.
+        "Incomplete token.",
+  },
+
+  'EXPONENT_MISSING': {
+    'id': 'CXPLCR',
+    'template':
+        "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': [
+      """
+main() {
+var i = 1e;
+}
+"""
+    ],
+  },
+
+  'HEX_DIGIT_EXPECTED': {
+    'id': 'GKCAGV',
+    'template': "A hex digit (0-9 or A-F) must follow '0x'.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX, // Seems obvious from the error message.
+    'examples': [
+      """
+main() {
+var i = 0x;
+}
+"""
+    ],
+  },
+
+  'MALFORMED_STRING_LITERAL': {
+    'id': 'DULNSD',
+    'template':
+        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 '$'.",
+    'examples': [
+      r"""
+main() {
+return '$';
+}
+""",
+      r'''
+main() {
+return "$";
+}
+''',
+      r"""
+main() {
+return '''$''';
+}
+""",
+      r'''
+main() {
+return """$""";
+}
+'''
+    ],
+  },
+
+  'UNTERMINATED_COMMENT': {
+    'id': 'NECJNM',
+    'template': "Comment starting with '/*' must end with '*/'.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX,
+    'examples': [
+      r"""
+main() {
+}
+/*"""
+    ],
+  },
+
+  'MISSING_TOKEN_BEFORE_THIS': {
+    'id': 'AFKXGU',
+    'template': "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': ["main() => true ? 1;", "main() => foo(x: 1 y: 2);",],
+  },
+
+  'MISSING_TOKEN_AFTER_THIS': {
+    'id': 'FMUFJL',
+    'template': "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': [
+      "main(x) {x}",
+      """
+class S1 {}
+class S2 {}
+class S3 {}
+class A = S1 with S2, S3
+main() => new A();
+"""
+    ],
+  },
+
+  'CONSIDER_ANALYZE_ALL': {
+    'id': 'HHILSH',
+    'template': "Could not find '#{main}'.  Nothing will be analyzed.",
+    'howToFix': "Try using '--analyze-all' to analyze everything.",
+    'examples': [''],
+  },
+
+  'MISSING_MAIN': {
+    'id': 'HNAOPV',
+    'template': "Could not find '#{main}'.",
+    // 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.
+    'howToFix': "Try adding a method named '#{main}' to your program."
+  },
+
+  'MAIN_NOT_A_FUNCTION': {
+    'id': 'PIURPA',
+    'template': "'#{main}' is not a function.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX, // Don't state the obvious.
+    'examples': ['var main;'],
+  },
+
+  'MAIN_WITH_EXTRA_PARAMETER': {
+    'id': 'ONOGQB',
+    'template': "'#{main}' cannot have more than two parameters.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX, // Don't state the obvious.
+    'examples': ['main(a, b, c) {}'],
+  },
+
+  'COMPILER_CRASHED': {
+    'id': 'MHDWAV',
+    'template': "The compiler crashed when compiling this element.",
+  },
+
+  'PLEASE_REPORT_THE_CRASH': {
+    'id': 'UUTHXX',
+    'template': '''
+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).
+''',
+  },
+
+  'POTENTIAL_MUTATION': {
+    'id': 'YGNLLB',
+    'template': "Variable '#{variableName}' is not known to be of type "
+        "'#{shownType}' because it is potentially mutated in the scope for "
+        "promotion.",
+  },
+
+  'POTENTIAL_MUTATION_HERE': {
+    'id': 'ATMSVX',
+    'template': "Variable '#{variableName}' is potentially mutated here.",
+  },
+
+  'POTENTIAL_MUTATION_IN_CLOSURE': {
+    'id': 'XUAHTW',
+    'template': "Variable '#{variableName}' is not known to be of type "
+        "'#{shownType}' because it is potentially mutated within a closure.",
+  },
+
+  'POTENTIAL_MUTATION_IN_CLOSURE_HERE': {
+    'id': 'UHFXLG',
+    'template': "Variable '#{variableName}' is potentially mutated in a "
+        "closure here.",
+  },
+
+  'ACCESSED_IN_CLOSURE': {
+    'id': 'JJHKSF',
+    'template': "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}'.",
+  },
+
+  'ACCESSED_IN_CLOSURE_HERE': {
+    'id': 'KMJVEA',
+    'template': "Variable '#{variableName}' is accessed in a closure here.",
+  },
+
+  'NOT_MORE_SPECIFIC': {
+    'id': 'EJHQAG',
+    'template': "Variable '#{variableName}' is not shown to have type "
+        "'#{shownType}' because '#{shownType}' is not more specific than the "
+        "known type '#{knownType}' of '#{variableName}'.",
+  },
+
+  'NOT_MORE_SPECIFIC_SUBTYPE': {
+    'id': 'APICDL',
+    'template': "Variable '#{variableName}' is not shown to have type "
+        "'#{shownType}' because '#{shownType}' is not a subtype of the "
+        "known type '#{knownType}' of '#{variableName}'.",
+  },
+
+  'NOT_MORE_SPECIFIC_SUGGESTION': {
+    'id': 'FFNCJX',
+    'template': "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}'.",
+  },
+
+  'NO_COMMON_SUBTYPES': {
+    'id': 'XKJOEC',
+    'template': "Types '#{left}' and '#{right}' have no common subtypes.",
+  },
+
+  'HIDDEN_WARNINGS_HINTS': {
+    'id': 'JBAWEK',
+    'template':
+        "#{warnings} warning(s) and #{hints} hint(s) suppressed in #{uri}.",
+  },
+
+  'HIDDEN_WARNINGS': {
+    'id': 'JIYWDC',
+    'template': "#{warnings} warning(s) suppressed in #{uri}.",
+  },
+
+  'HIDDEN_HINTS': {
+    'id': 'RHNXQT',
+    'template': "#{hints} hint(s) suppressed in #{uri}.",
+  },
+
+  'PREAMBLE': {
+    'id': 'GXGWIF',
+    'template': "When run on the command-line, the compiled output might"
+        " require a preamble file located in:\n"
+        "  <sdk>/lib/_internal/js_runtime/lib/preambles.",
+  },
+
+  'INVALID_SYNC_MODIFIER': {
+    'id': 'FNYUYU',
+    'template': "Invalid modifier 'sync'.",
+    'options': ['--enable-async'],
+    'howToFix': "Try replacing 'sync' with 'sync*'.",
+    'examples': ["main() sync {}"],
+  },
+
+  'INVALID_AWAIT_FOR': {
+    'id': 'IEYGCY',
+    'template': "'await' is only supported on for-in loops.",
+    'options': ['--enable-async'],
+    'howToFix': "Try rewriting the loop as a for-in loop or removing the "
+        "'await' keyword.",
+    'examples': [
+      """
+main() async* {
+await for (int i = 0; i < 10; i++) {}
+}
+"""
+    ],
+  },
+
+  'ASYNC_MODIFIER_ON_ABSTRACT_METHOD': {
+    'id': 'VRISLY',
+    'template':
+        "The modifier '#{modifier}' is not allowed on an abstract method.",
+    'options': ['--enable-async'],
+    'howToFix': "Try removing the '#{modifier}' modifier or adding a "
+        "body to the method.",
+    'examples': [
+      """
+abstract class A {
+method() async;
+}
+class B extends A {
+method() {}
+}
+main() {
+A a = new B();
+a.method();
+}
+"""
+    ],
+  },
+
+  'ASYNC_MODIFIER_ON_CONSTRUCTOR': {
+    'id': 'DHCFON',
+    'template': "The modifier '#{modifier}' is not allowed on constructors.",
+    'options': ['--enable-async'],
+    'howToFix': "Try removing the '#{modifier}' modifier.",
+    'examples': [
+      """
+class A {
+A() async;
+}
+main() => new A();""",
+      """
+class A {
+A();
+factory A.a() async* {}
+}
+main() => new A.a();"""
+    ],
+  },
+
+  'ASYNC_MODIFIER_ON_SETTER': {
+    'id': 'NMJLJE',
+    'template': "The modifier '#{modifier}' is not allowed on setters.",
+    'options': ['--enable-async'],
+    'howToFix': "Try removing the '#{modifier}' modifier.",
+    'examples': [
+      """
+class A {
+set foo(v) async {}
+}
+main() => new A().foo = 0;"""
+    ],
+  },
+
+  'YIELDING_MODIFIER_ON_ARROW_BODY': {
+    'id': 'UOGLUX',
+    'template':
+        "The modifier '#{modifier}' is not allowed on methods implemented "
+        "using '=>'.",
+    'options': ['--enable-async'],
+    'howToFix': "Try removing the '#{modifier}' modifier or implementing "
+        "the method body using a block: '{ ... }'.",
+    'examples': ["main() sync* => null;", "main() async* => null;"],
+  },
+
+  // TODO(johnniwinther): Check for 'async' as identifier.
+  'ASYNC_KEYWORD_AS_IDENTIFIER': {
+    'id': 'VTWSMA',
+    'template':
+        "'#{keyword}' cannot be used as an identifier in a function body "
+        "marked with '#{modifier}'.",
+    'options': ['--enable-async'],
+    'howToFix': "Try removing the '#{modifier}' modifier or renaming the "
+        "identifier.",
+    'examples': [
+      """
+main() async {
+var await;
+}""",
+      """
+main() async* {
+var yield;
+}""",
+      """
+main() sync* {
+var yield;
+}"""
+    ],
+  },
+
+  'RETURN_IN_GENERATOR': {
+    'id': 'AWGUVF',
+    'template':
+        "'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': [
+      """
+foo() async* { return 0; }
+main() => foo();
+""",
+      """
+foo() sync* { return 0; }
+main() => foo();
+"""
+    ],
+  },
+
+  'NATIVE_NOT_SUPPORTED': {
+    'id': 'QMMLUT',
+    'template': "'native' modifier is not supported.",
+    'howToFix': "Try removing the 'native' implementation or analyzing the "
+        "code with the --allow-native-extensions option.",
+    'examples': [
+      """
+main() native "Main";
+"""
+    ],
+  },
+
+  'DART_EXT_NOT_SUPPORTED': {
+    'id': 'JLPQFJ',
+    'template': "The 'dart-ext' scheme is not supported.",
+    'howToFix': "Try analyzing the code with the --allow-native-extensions "
+        "option.",
+    'examples': [
+      """
+import 'dart-ext:main';
+
+main() {}
+"""
+    ],
+  },
+
+  'LIBRARY_TAG_MUST_BE_FIRST': {
+    'id': 'JFUSRX',
+    'template':
+        "The library declaration should come before other declarations.",
+    'howToFix': "Try moving the declaration to the top of the file.",
+    'examples': [
+      """
+import 'dart:core';
+library foo;
+main() {}
+""",
+    ],
+  },
+
+  'ONLY_ONE_LIBRARY_TAG': {
+    'id': 'CCXFMY',
+    'template': "There can only be one library declaration.",
+    'howToFix': "Try removing all other library declarations.",
+    'examples': [
+      """
+library foo;
+library bar;
+main() {}
+""",
+      """
+library foo;
+import 'dart:core';
+library bar;
+main() {}
+""",
+    ],
+  },
+
+  'IMPORT_BEFORE_PARTS': {
+    'id': 'NSMOQI',
+    'template': "Import declarations should come before parts.",
+    'howToFix': "Try moving this import further up in the file.",
+    'examples': [
+      {
+        'main.dart': """
+library test.main;
+part 'part.dart';
+import 'dart:core';
+main() {}
+""",
+        'part.dart': """
+part of test.main;
+""",
+      }
+    ],
+  },
+
+  'EXPORT_BEFORE_PARTS': {
+    'id': 'KYJTTC',
+    'template': "Export declarations should come before parts.",
+    'howToFix': "Try moving this export further up in the file.",
+    'examples': [
+      {
+        'main.dart': """
+library test.main;
+part 'part.dart';
+export 'dart:core';
+main() {}
+""",
+        'part.dart': """
+part of test.main;
+""",
+      }
+    ],
+
+//////////////////////////////////////////////////////////////////////////////
+// Patch errors start.
+//////////////////////////////////////////////////////////////////////////////
+  },
+
+  'PATCH_RETURN_TYPE_MISMATCH': {
+    'id': 'DTOQDU',
+    'template': "Patch return type '#{patchReturnType}' does not match "
+        "'#{originReturnType}' on origin method '#{methodName}'.",
+  },
+
+  'PATCH_REQUIRED_PARAMETER_COUNT_MISMATCH': {
+    'id': 'KJUUYC',
+    'template': "Required parameter count of patch method "
+        "(#{patchParameterCount}) does not match parameter count on origin "
+        "method '#{methodName}' (#{originParameterCount}).",
+  },
+
+  'PATCH_OPTIONAL_PARAMETER_COUNT_MISMATCH': {
+    'id': 'GUTGTE',
+    'template': "Optional parameter count of patch method "
+        "(#{patchParameterCount}) does not match parameter count on origin "
+        "method '#{methodName}' (#{originParameterCount}).",
+  },
+
+  'PATCH_OPTIONAL_PARAMETER_NAMED_MISMATCH': {
+    'id': 'MCHEIC',
+    'template': "Optional parameters of origin and patch method "
+        "'#{methodName}' must both be either named or positional.",
+  },
+
+  'PATCH_PARAMETER_MISMATCH': {
+    'id': 'XISHPB',
+    'template': "Patch method parameter '#{patchParameter}' does not match "
+        "'#{originParameter}' on origin method '#{methodName}'.",
+  },
+
+  'PATCH_PARAMETER_TYPE_MISMATCH': {
+    'id': 'UGRBYD',
+    'template': "Patch method parameter '#{parameterName}' type "
+        "'#{patchParameterType}' does not match '#{originParameterType}' on "
+        "origin method '#{methodName}'.",
+  },
+
+  'PATCH_EXTERNAL_WITHOUT_IMPLEMENTATION': {
+    'id': 'WSNMKD',
+    'template': "External method without an implementation.",
+  },
+
+  'PATCH_POINT_TO_FUNCTION': {
+    'id': 'CAVBPN',
+    'template': "This is the function patch '#{functionName}'.",
+  },
+
+  'PATCH_POINT_TO_CLASS': {
+    'id': 'TWDLDX',
+    'template': "This is the class patch '#{className}'.",
+  },
+
+  'PATCH_POINT_TO_GETTER': {
+    'id': 'TRBBNY',
+    'template': "This is the getter patch '#{getterName}'.",
+  },
+
+  'PATCH_POINT_TO_SETTER': {
+    'id': 'DAXDLW',
+    'template': "This is the setter patch '#{setterName}'.",
+  },
+
+  'PATCH_POINT_TO_CONSTRUCTOR': {
+    'id': 'VYQISY',
+    'template': "This is the constructor patch '#{constructorName}'.",
+  },
+
+  'PATCH_POINT_TO_PARAMETER': {
+    'id': 'TFPAGO',
+    'template': "This is the patch parameter '#{parameterName}'.",
+  },
+
+  'PATCH_NON_EXISTING': {
+    'id': 'AWOACF',
+    'template': "Origin does not exist for patch '#{name}'.",
+  },
+
+  // TODO(ahe): Eventually, this error should be removed as it will be
+  // handled by the regular parser.
+  'PATCH_NONPATCHABLE': {
+    'id': 'WQEPJI',
+    'template': "Only classes and functions can be patched.",
+  },
+
+  'PATCH_NON_EXTERNAL': {
+    'id': 'MHLXNK',
+    'template': "Only external functions can be patched.",
+  },
+
+  'PATCH_NON_CLASS': {
+    'id': 'UIALAB',
+    'template': "Patching non-class with class patch '#{className}'.",
+  },
+
+  'PATCH_NON_GETTER': {
+    'id': 'VTNQCJ',
+    'template': "Cannot patch non-getter '#{name}' with getter patch.",
+  },
+
+  'PATCH_NO_GETTER': {
+    'id': 'XOPDHD',
+    'template': "No getter found for getter patch '#{getterName}'.",
+  },
+
+  'PATCH_NON_SETTER': {
+    'id': 'XBOMMN',
+    'template': "Cannot patch non-setter '#{name}' with setter patch.",
+  },
+
+  'PATCH_NO_SETTER': {
+    'id': 'YITARQ',
+    'template': "No setter found for setter patch '#{setterName}'.",
+  },
+
+  'PATCH_NON_CONSTRUCTOR': {
+    'id': 'TWAEQV',
+    'template': "Cannot patch non-constructor with constructor patch "
+        "'#{constructorName}'.",
+  },
+
+  'PATCH_NON_FUNCTION': {
+    'id': 'EDXBPI',
+    'template': "Cannot patch non-function with function patch "
+        "'#{functionName}'.",
+  },
+
+  'INJECTED_PUBLIC_MEMBER': {
+    'id': 'JGMXMI',
+    'template': "Non-patch members in patch libraries must be private.",
+  },
+
+  'EXTERNAL_WITH_BODY': {
+    'id': 'GAVMSQ',
+    'template':
+        "External function '#{functionName}' cannot have a function body.",
+    'options': ["--output-type=dart"],
+    'howToFix': "Try removing the 'external' modifier or the function body.",
+    'examples': [
+      """
+external foo() => 0;
+main() => foo();
+""",
+      """
+external foo() {}
+main() => foo();
+"""
+    ],
+
+//////////////////////////////////////////////////////////////////////////////
+// Patch errors end.
+//////////////////////////////////////////////////////////////////////////////
+  },
+
+  'EXPERIMENTAL_ASSERT_MESSAGE': {
+    'id': 'NENGIS',
+    'template': "Experimental language feature 'assertion with message'"
+        " is not supported.",
+    'howToFix':
+        "Use option '--assert-message' to use assertions with messages.",
+    'examples': [
+      r'''
+main() {
+int n = -7;
+assert(n > 0, 'must be positive: $n');
+}
+'''
+    ],
+  },
+
+  'IMPORT_EXPERIMENTAL_MIRRORS': {
+    'id': 'SCJYPH',
+    'template': '''
+
+****************************************************************
+* WARNING: dart:mirrors support in dart2js is experimental,
+*          and not recommended.
+*          This implementation of mirrors is incomplete,
+*          and often greatly increases the size of the generated
+*          JavaScript code.
+*
+* Your app imports dart:mirrors via:'''
+        '''
+$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
+****************************************************************
+''',
+  },
+
+  'DISALLOWED_LIBRARY_IMPORT': {
+    'id': 'OCSFJU',
+    'template': '''
+Your app imports the unsupported library '#{uri}' via:
+'''
+        '''
+$DISALLOWED_LIBRARY_IMPORT_PADDING#{importChain}
+
+Use the --categories option to support import of '#{uri}'.
+''',
+  },
+
+  'MIRRORS_LIBRARY_NOT_SUPPORT_BY_BACKEND': {
+    'id': 'JBTRRM',
+    'template': """
+dart:mirrors library is not supported when using this backend.
+
+Your app imports dart:mirrors via:"""
+        """
+$MIRRORS_NOT_SUPPORTED_BY_BACKEND_PADDING#{importChain}""",
+  },
+
+  'CALL_NOT_SUPPORTED_ON_NATIVE_CLASS': {
+    'id': 'HAULDW',
+    'template': "Non-supported 'call' member on a native class, or a "
+        "subclass of a native class.",
+  },
+
+  'DIRECTLY_THROWING_NSM': {
+    'id': 'XLTPCS',
+    'template': "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);'.",
+  },
+
+  'COMPLEX_THROWING_NSM': {
+    'id': 'PLCXVX',
+    'template': "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);'.",
+  },
+
+  'COMPLEX_RETURNING_NSM': {
+    'id': 'HUTCTQ',
+    'template': "Overriding 'noSuchMethod' causes the compiler to generate "
+        "more code and prevents the compiler from doing some optimizations.",
+    'howToFix': "Consider removing this 'noSuchMethod' implementation."
+  },
+
+  'UNRECOGNIZED_VERSION_OF_LOOKUP_MAP': {
+    'id': 'OVAFEW',
+    'template': "Unsupported version of package:lookup_map.",
+    'howToFix': DONT_KNOW_HOW_TO_FIX
+  },
+};