Refactor strong mode to use standard Analyzer errors

pkg/analyzer/lib/src/task/dart.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.src.task.dart;
 
 import 'dart:collection';
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
@@ skipping 5664 matching lines @@
   @override
   void internalPerform() {
     RecordingErrorListener errorListener = new RecordingErrorListener();
     //
     // Prepare inputs.
     //
     TypeProvider typeProvider = getRequiredInput(TYPE_PROVIDER_INPUT);
     CompilationUnit unit = getRequiredInput(UNIT_INPUT);
     AnalysisOptionsImpl options = context.analysisOptions;
     if (options.strongMode) {
-      unit.accept(new CodeChecker(
-          typeProvider, new StrongTypeSystemImpl(), errorListener,
-          options));
+      CodeChecker checker = new CodeChecker(
+          typeProvider,
+          new StrongTypeSystemImpl(implicitCasts: options.implicitCasts),
+          errorListener,
+          options);
+      checker.visitCompilationUnit(unit);
     }
     //
     // Record outputs.
     //
     outputs[STRONG_MODE_ERRORS] = getUniqueErrors(errorListener.errors);
     outputs[CREATED_RESOLVED_UNIT] = true;
     outputs[RESOLVED_UNIT] = unit;
   }
 
   /**
@@ skipping 290 matching lines @@
 
   @override
   bool moveNext() {
     if (_newSources.isEmpty) {
       return false;
     }
     currentTarget = _newSources.removeLast();
     return true;
   }
 }