Move messages out of dart2js.

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

Index: pkg/compiler/lib/src/diagnostics/dart2js_messages.dart
diff --git a/pkg/compiler/lib/src/diagnostics/dart2js_messages.dart b/pkg/compiler/lib/src/diagnostics/dart2js_messages.dart
new file mode 100644
index 0000000000000000000000000000000000000000..2dfa32434189d608b63bd6d94e5dbcbe56e000c9
--- /dev/null
+++ b/pkg/compiler/lib/src/diagnostics/dart2js_messages.dart
@@ -0,0 +1,3674 @@
+// 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].

[Siggi Cherem (dart-lang), 2015/12/10 01:05:30]

It would be good to add a guideline also on what to do when moving a message
from here to shared.dart. For example:
- keep the old entry here
- add an extra field "deprecated" that indicates the forwarding ID in the shared
location

[floitsch, 2015/12/10 01:21:15]

Agreed.
Once we know what and how to move we should update the comment.

+
+/// 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',

[Siggi Cherem (dart-lang), 2015/12/10 01:05:30]

What's the benefit on using the random sequence for the ID rather than a number?
How do we generate a new unique sequence when adding a new message to ensure
there are no collisions with messages in any other tool? I initially had in mind
to use a pair: area + number, for example: ['dart2js', 42], ['shared', 1],
['analyzer', 31]. So adding at the end of a file becomes pretty trivial.

[floitsch, 2015/12/10 01:21:15]

Personally I prefer IDs (although 6 might be too short).
There can't be an area, since the whole goal is to have shared messages. If we
prefixed messages with "dart2js" and the analyzer gave the message, it would
look really bad.
We could just increment the numbers, but then all users of the messages must
make sure that they don't collide (including users within the same team).
Unique IDs also have a higher chance to yield unique Google results.
"Error XQSRXO" has a higher chance of finding the exact error than "Error
400441".

I believe that we will need "subids" though: "Error XQSRXO-1"

All this is not set in stone, though.

+    '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;
+"""
+      }
+    ],
+  },
+
+  'IMPORT_PART_OF_HERE': {
+    'id': 'TRSZOJ',
+    'template': 'The library is imported here.',
+  },
+
+  '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;"],
+  },
+
+  'CONST_LOOP_VARIABLE': {
+    'id': 'WUSKMG',
+    'template': "A loop variable cannot be constant.",
+    'howToFix': "Try remove the 'const' modifier or "
+        "replacing it with a 'final' modifier.",
+    'examples': [
+      """
+void main() {
+  for (const c in []) {}
+}"""
+    ],
+  },
+
+  '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}'.",
+  },
+
+  'INVALID_METADATA': {
+    'id': 'RKJGDE',
+    'template':
+        "A metadata annotation must be either a reference to a compile-time "
+        "constant variable or a call to a constant constructor.",
+    'howToFix':
+        "Try using a different constant value or referencing it through a "
+        "constant variable.",
+    'examples': [
+'@Object main() {}',
+'@print main() {}']
+  },
+
+  'INVALID_METADATA_GENERIC': {
+    'id': 'WEEDQD',
+    'template':
+        "A metadata annotation using a constant constructor cannot use type "
+        "arguments.",
+    'howToFix':
+        "Try removing the type arguments or referencing the constant "
+        "through a constant variable.",
+    'examples': [
+      '''
+class C<T> {
+  const C();
+}
+@C<int>() main() {}
+'''],
+  },
+
+  '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
+  },
+};