Remove peeking from parseTypedef and parseClassOrNamedMixinApplication.

pkg/front_end/lib/src/fasta/parser/identifier_context.dart

 // Copyright (c) 2017, 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.
 
 /// Information about the parser state which is passed to the listener at the
 /// time an identifier is encountered.
 ///
 /// This can be used by the listener to determine the context in which the
 /// identifier appears; that in turn can help the listener decide how to resolve
 /// the identifier (if the listener is doing resolution).
@@ skipping 77 matching lines @@
 
   /// Identifier is the type name being declared by an enum declaration.
   static const enumDeclaration = const IdentifierContext._('enumDeclaration',
       inDeclaration: true, isBuiltInIdentifierAllowed: false);
 
   /// Identifier is an enumerated value name being declared by an enum
   /// declaration.
   static const enumValueDeclaration =
       const IdentifierContext._('enumValueDeclaration', inDeclaration: true);
 
-  /// Identifier is the name being declared by a named mixin declaration (e.g.
-  /// `Foo` in `class Foo = X with Y;`).
-  static const namedMixinDeclaration = const IdentifierContext._(
-      'namedMixinDeclaration',
+  /// Identifier is the name being declared by a class declaration or a named
+  /// mixin application, for example, `Foo` in `class Foo = X with Y;`.
+  static const classOrNamedMixinDeclaration = const IdentifierContext._(
+      'classOrNamedMixinDeclaration',
       inDeclaration: true,
       isBuiltInIdentifierAllowed: false);
 
-  /// Identifier is the name being declared by a class declaration.
-  static const classDeclaration = const IdentifierContext._('classDeclaration',
-      inDeclaration: true, isBuiltInIdentifierAllowed: false);
-
   /// Identifier is the name of a type variable being declared (e.g. `Foo` in
   /// `class C<Foo extends num> {}`).
   static const typeVariableDeclaration = const IdentifierContext._(
       'typeVariableDeclaration',
       inDeclaration: true,
       isBuiltInIdentifierAllowed: false);
 
   /// Identifier is the start of a reference to a type that starts with prefix.
   static const prefixedTypeReference = const IdentifierContext._(
       'prefixedTypeReference',
@@ skipping 176 matching lines @@
       bool allowedInConstantExpression})
       : this.allowedInConstantExpression =
             // Generally, declarations are legal in constant expressions.  A
             // continuation doesn't affect constant expressions: if what it's
             // continuing is a problem, it has already been reported.
             allowedInConstantExpression ??
                 (inDeclaration || isContinuation || inSymbol);
 
   String toString() => _name;
 }