Report errors for the new top-level inference rules.

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/standard_resolution_map.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
@@ skipping 2900 matching lines @@
         typeM);
     expect(variableC.initializer.staticType, typeM);
   }
 
   void test_perform_simple() {
     enableStrongMode();
     AnalysisTarget source = newSource(
         '/test.dart',
         '''
 var X = 1;
-
-var Y = () {
-  return 1 + X;
-};
+var Y = () => 1 + X;
 ''');
     computeResult(new LibrarySpecificUnit(source, source), RESOLVED_UNIT8,
         matcher: isInferStaticVariableTypesInUnitTask);
     CompilationUnit unit = outputs[RESOLVED_UNIT8];
     TopLevelVariableDeclaration declaration = unit.declarations[1];
     FunctionExpression function =
         declaration.variables.variables[0].initializer;
-    BlockFunctionBody body = function.body;
-    ReturnStatement statement = body.block.statements[0];
-    Expression expression = statement.expression;
+    ExpressionFunctionBody body = function.body;
+    Expression expression = body.expression;
     InterfaceType intType = context.typeProvider.intType;
     expect(expression.staticType, intType);
   }
 
   test_staticModeHints_forStaticVariableInference() {
     context.analysisOptions =
         new AnalysisOptionsImpl.from(context.analysisOptions)
           ..strongModeHints = true;
     Source source = newSource(
         '/test.dart',
@@ skipping 2800 matching lines @@
   /**
    * Fill [errorListener] with [result] errors in the current [task].
    */
   void _fillErrorListener(ResultDescriptor<List<AnalysisError>> result) {
     List<AnalysisError> errors = task.outputs[result] as List<AnalysisError>;
     expect(errors, isNotNull, reason: result.name);
     errorListener = new GatheringErrorListener();
     errorListener.addAll(errors);
   }
 }