improve recovery of invalid top level abstract modifier usage

pkg/analyzer/test/generated/parser_test.dart

 // Copyright (c) 2014, 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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_ast_factory.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/error/error.dart';
 import 'package:analyzer/error/listener.dart';
@@ skipping 14089 matching lines @@
     }
     expect(unit.scriptTag, isNull);
     expect(unit.directives, hasLength(0));
     expect(unit.declarations, hasLength(1));
   }
 
   void test_parseCompilationUnitMember_abstractAsPrefix() {
     createParser('abstract.A _abstract = new abstract.A();');
     CompilationUnitMember member = parseFullCompilationUnitMember();
     expect(member, isNotNull);
-    if (usingFastaParser) {
-      // TODO(danrubel): should not be generating an error
-      assertErrorsWithCodes([ParserErrorCode.EXPECTED_TYPE_NAME]);
-    } else {
-      assertNoErrors();
-    }
+    assertNoErrors();
     expect(member, new isInstanceOf<TopLevelVariableDeclaration>());
     TopLevelVariableDeclaration declaration = member;
     expect(declaration.semicolon, isNotNull);
     expect(declaration.variables, isNotNull);
   }
 
   void test_parseCompilationUnitMember_class() {
     createParser('class A {}');
     CompilationUnitMember member = parseFullCompilationUnitMember();
     expect(member, isNotNull);
@@ skipping 1354 matching lines @@
     expectCommentText(typeVariable.documentationComment, '/// Doc');
   }
 
   /**
    * Assert that the given [name] is in declaration context.
    */
   void _assertIsDeclarationName(SimpleIdentifier name) {
     expect(name.inDeclarationContext(), isTrue);
   }
 }