remove unused locals/members/test functions

pkg/analyzer/test/src/task/dart_test.dart

 // Copyright (c) 2015, 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 analyzer.test.src.task.dart_test;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
 import 'package:analyzer/dart/element/type.dart';
@@ skipping 478 matching lines @@
       '/libA.dart': '''
 @a library libA;
 @b import 'libB.dart';
 @c export 'libC.dart';
 @d part 'part.dart';''',
       '/libB.dart': 'library libB;',
       '/libC.dart': 'library libC;',
       '/part.dart': 'part of libA;'
     });
     Source sourceA = sources[0];
-    Source sourcePart = sources[3];
     // perform task
     computeResult(sourceA, LIBRARY_ELEMENT2,
         matcher: isBuildDirectiveElementsTask);
     // Get outputs
     LibraryElement libraryA =
         context.getCacheEntry(sourceA).getValue(LIBRARY_ELEMENT2);
     // Validate metadata
     checkMetadata(libraryA, libraryA.definingCompilationUnit);
     checkMetadata(libraryA.imports[0], libraryA.definingCompilationUnit);
     checkMetadata(libraryA.exports[0], libraryA.definingCompilationUnit);
@@ skipping 4429 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result];
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }