dart2js: accept const map literals as expression statements.

pkg/compiler/lib/src/scanner/parser.dart

 // Copyright (c) 2012, 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.
 
 part of scanner;
 
 class FormalParameterType {
   final String type;
   const FormalParameterType(this.type);
   bool get isRequired => this == REQUIRED;
@@ skipping 1613 matching lines @@
       }
     }
     return parseExpressionStatement(token);
   }
 
   Token parseExpressionStatementOrConstDeclaration(Token token) {
     assert(identical(token.stringValue, 'const'));
     if (isModifier(token.next)) {
       return parseVariablesDeclaration(token);
     }
-    Token identifier = peekIdentifierAfterOptionalType(token.next);

[ahe, 2014/12/12 14:32:41]

peekIdentifierAfterOptionalType is only called once, so it should be handling
this case.

[floitsch, 2014/12/12 14:38:47]

Done.

+
+    Token identifier;
+    if (optional('void', token.next) || token.next.isIdentifier()) {
+      identifier = peekIdentifierAfterOptionalType(token.next);
+    }
     if (identifier != null) {
       assert(identifier.isIdentifier());
       Token afterId = identifier.next;
       int afterIdKind = afterId.kind;
       if (identical(afterIdKind, EQ_TOKEN) ||
           identical(afterIdKind, SEMICOLON_TOKEN) ||
           identical(afterIdKind, COMMA_TOKEN)) {
         // We are looking at "const type identifier" followed by '=', ';', or
         // ','.
         return parseVariablesDeclaration(token);
@@ skipping 948 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }