Fix incremental parsing of import combinators.

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.
 
 library engine.parser_test;
 
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/error.dart';
 import 'package:analyzer/src/generated/incremental_scanner.dart';
@@ skipping 2586 matching lines @@
   }
 
   void test_insert_final_before_field_declaration() {
     _assertParse('class C { ', '', 'final ', 'int x; }');
   }
 
   void test_insert_function_parameter() {
     _assertParse('class C { void f(', '', 'arg', ') {} }');
   }
 
+  void test_insert_identifier_inCombinator() {
+    _assertParse("import 'foo.dart' show x", "", ", y", ";");
+  }
+
   void test_insert_insideClassBody() {
     // "class C {C(); }"
     // "class C { C(); }"
     _assertParse("class C {", "", " ", "C(); }");
   }
 
   void test_insert_insideIdentifier() {
     // "f() => cob;"
     // "f() => cow.b;"
     _assertParse("f() => co", "", "w.", "b;");
@@ skipping 3879 matching lines @@
     expect(classTypeAlias.keyword, isNotNull);
     expect(classTypeAlias.name.name, "A");
     expect(classTypeAlias.equals, isNotNull);
     expect(classTypeAlias.abstractKeyword, isNull);
     expect(classTypeAlias.superclass.name.name, isNotNull, reason: "B");
     expect(classTypeAlias.withClause, isNotNull);
     expect(classTypeAlias.implementsClause, isNotNull);
     expect(classTypeAlias.semicolon, isNotNull);
   }
 
+  void test_parseCombinator_hide() {
+    HideCombinator combinator =
+        ParserTestCase.parse4('parseCombinator', 'hide a;');
+    expect(combinator, new isInstanceOf<HideCombinator>());
+    expect(combinator.keyword, isNotNull);
+    expect(combinator.hiddenNames, hasLength(1));
+  }
+
+  void test_parseCombinator_show() {
+    ShowCombinator combinator =
+        ParserTestCase.parse4('parseCombinator', 'show a;');
+    expect(combinator, new isInstanceOf<ShowCombinator>());
+    expect(combinator.keyword, isNotNull);
+    expect(combinator.shownNames, hasLength(1));
+  }
+
   void test_parseCombinators_h() {
     List<Combinator> combinators =
         ParserTestCase.parse4("parseCombinators", "hide a;");
     expect(combinators, hasLength(1));
     HideCombinator combinator = combinators[0] as HideCombinator;
     expect(combinator, isNotNull);
     expect(combinator.keyword, isNotNull);
     expect(combinator.hiddenNames, hasLength(1));
   }
 
@@ skipping 4322 matching lines @@
     // Parse the source.
     //
     Parser parser = new Parser(null, listener);
     return invokeParserMethodImpl(
         parser,
         methodName,
         <Object>[tokenStream],
         tokenStream) as Token;
   }
 }