Fix error reporting on member declarations.

lib/compiler/implementation/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.
 
 /**
  * An event generating parser of Dart programs. This parser expects
  * all tokens in a linked list (aka a token stream).
  *
  * The class [Scanner] is used to generate a token stream. See the
  * file scanner.dart.
@@ skipping 626 matching lines @@
       listener.endTopLevelFields(fieldCount, start, token);
     } else {
       token = parseFormalParametersOpt(token);
       token = parseFunctionBody(token, false);
       listener.endTopLevelMethod(start, getOrSet, token);
     }
     return token.next;
   }
 
   Link<Token> findMemberName(Token token) {
+    Token start = token;
     Link<Token> identifiers = const EmptyLink<Token>();
     while (token.kind !== EOF_TOKEN) {
       String value = token.stringValue;
       if ((value === '(') || (value === '{') || (value === '=>')) {
         // A method.
         return identifiers;
       } else if ((value === '=') || (value === ';') || (value === ',')) {
         // A field or abstract getter.
         return identifiers;
       }
       identifiers = identifiers.prepend(token);
       if (isValidTypeReference(token)) {
         // type ...
         if (optional('.', token.next)) {
           // type '.' ...
           if (token.next.next.isIdentifier()) {
             // type '.' identifier
             token = token.next.next;
           }
         }
         if (optional('<', token.next)) {
           if (token.next is BeginGroupToken) {
             BeginGroupToken beginGroup = token.next;
             token = beginGroup.endGroup;
           }
         }
       }
       token = token.next;
     }
-    return listener.unexpected(token);
+    return listener.expectedDeclaration(start);
   }
 
   Token parseVariableInitializerOpt(Token token) {
     if (optional('=', token)) {
       Token assignment = token;
       listener.beginInitializer(token);
       token = parseExpression(token.next);
       listener.endInitializer(assignment);
     }
     return token;
@@ skipping 1402 matching lines @@
     }
     listener.handleContinueStatement(hasTarget, continueKeyword, token);
     return expectSemicolon(token);
   }
 
   Token parseEmptyStatement(Token token) {
     listener.handleEmptyStatement(token);
     return expectSemicolon(token);
   }
 }