Remove visitLabelElement() and visitLocalVariableElement().

pkg/analyzer/test/generated/strong_mode_test.dart

 // Copyright (c) 2016, 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.generated.strong_mode_test;
 
 import 'dart:async';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/standard_resolution_map.dart';
@@ skipping 491 matching lines @@
     var covariantD = getClassCovariantParameters(AstFinder.getClass(unit, "D"));
     expect(covariantD, null);
 
     var classE = AstFinder.getClass(unit, "E");
     var covariantE = getClassCovariantParameters(classE);
     var superCovariantE = getSuperclassCovariantParameters(classE);
     expect(covariantE.toList(), []);
     expect(superCovariantE.toList(), [dAdd.element.parameters[0]]);
   }
 
-  @soloTest
   test_covarianceChecks_returnFunction() async {
     var source = addSource(r'''
 typedef F<T>(T t);
 typedef T R<T>();
 class C<T> {
   F<T> f;
 
   C();
   factory C.fact() => new C<Null>();
 
@@ skipping 3691 matching lines @@
   var v = x;
   v; // marker
 }
 int x = 3;
 ''';
     CompilationUnit unit = await resolveSource(code);
     assertPropagatedAssignedType(code, unit, typeProvider.intType, null);
     assertTypeOfMarkedExpression(code, unit, typeProvider.intType, null);
   }
 }