Batch the batch compiler for tests

lib/src/checker/checker.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 dev_compiler.src.checker.checker;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/src/generated/ast.dart';
 import 'package:analyzer/src/generated/element.dart';
 import 'package:analyzer/src/generated/scanner.dart' show Token, TokenType;
@@ skipping 313 matching lines @@
 }
 
 /// Checks the body of functions and properties.
 class CodeChecker extends RecursiveAstVisitor {
   final TypeRules rules;
   final AnalysisErrorListener reporter;
   final _OverrideChecker _overrideChecker;
   bool _failure = false;
   bool get failure => _failure || _overrideChecker._failure;
 
+  void reset() {
+    _failure = false;
+    _overrideChecker._failure = false;
+  }
+
   CodeChecker(TypeRules rules, AnalysisErrorListener reporter,
       StrongModeOptions options)
       : rules = rules,
         reporter = reporter,
         _overrideChecker = new _OverrideChecker(rules, reporter, options);
 
   @override
   void visitCompilationUnit(CompilationUnit unit) {
     void report(Expression expr) {
       reporter.onError(new MissingTypeError(expr).toAnalysisError());
@@ skipping 612 matching lines @@
     if (info is CoercionInfo) {
       // TODO(jmesserly): if we're run again on the same AST, we'll produce the
       // same annotations. This should be harmless. This might go away once
       // CodeChecker is integrated better with analyzer, as it will know that
       // checking has already been performed.
       // assert(CoercionInfo.get(info.node) == null);
       CoercionInfo.set(info.node, info);
     }
   }
 }