Add local type inference logic for integer literals.

pkg/front_end/lib/src/fasta/source/source_loader.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 fasta.source_loader;
 
 import 'dart:async' show Future;
 
 import 'dart:typed_data' show Uint8List;
 
 import 'package:front_end/src/base/instrumentation.dart' show Instrumentation;
 
 import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart'
     show KernelTypeInferrer;
 
+import 'package:front_end/src/fasta/kernel/kernel_target.dart'
+    show KernelTarget;
+
 import 'package:kernel/ast.dart' show Program;
 
 import 'package:kernel/class_hierarchy.dart' show ClassHierarchy;
 
 import 'package:kernel/core_types.dart' show CoreTypes;
 
 import '../builder/builder.dart' show Builder, ClassBuilder, LibraryBuilder;
 
 import '../compiler_context.dart' show CompilerContext;
 
 import '../errors.dart' show inputError;
 
 import '../export.dart' show Export;
 
 import '../loader.dart' show Loader;
 
 import '../parser/class_member_parser.dart' show ClassMemberParser;
 
 import '../scanner.dart' show ErrorToken, ScannerResult, Token, scan;
 
 import '../io.dart' show readBytesFromFile;
 
-import '../target_implementation.dart' show TargetImplementation;
-
 import 'diet_listener.dart' show DietListener;
 
 import 'diet_parser.dart' show DietParser;
 
 import 'outline_builder.dart' show OutlineBuilder;
 
 import 'source_class_builder.dart' show SourceClassBuilder;
 
 import 'source_library_builder.dart' show SourceLibraryBuilder;
 
 class SourceLoader<L> extends Loader<L> {
   final Map<Uri, List<int>> sourceBytes = <Uri, List<int>>{};
   final bool excludeSource = CompilerContext.current.options.excludeSource;
 
   // Used when building directly to kernel.
   ClassHierarchy hierarchy;
   CoreTypes coreTypes;
 
   Instrumentation instrumentation;
 
-  SourceLoader(TargetImplementation target) : super(target);
+  SourceLoader(KernelTarget target) : super(target);
 
   Future<Token> tokenize(SourceLibraryBuilder library,
       {bool suppressLexicalErrors: false}) async {
     Uri uri = library.fileUri;
     if (uri == null || uri.scheme != "file") {
       return inputError(library.uri, -1, "Not found: ${library.uri}.");
     }
     List<int> bytes = sourceBytes[uri];
     if (bytes == null) {
       bytes = sourceBytes[uri] = await readBytesFromFile(uri);
@@ skipping 47 matching lines @@
       for (SourceLibraryBuilder part in library.parts) {
         Token tokens = await tokenize(part);
         if (tokens != null) {
           listener.uri = part.fileUri;
           parser.parseUnit(tokens);
         }
       }
     }
   }
 
+  KernelTarget get target => super.target;
+
   DietListener createDietListener(LibraryBuilder library) {
-    return new DietListener(library, hierarchy, coreTypes,
-        new KernelTypeInferrer(coreTypes, hierarchy, instrumentation));
+    var typeInferrer = target.strongMode
+        ? new KernelTypeInferrer(coreTypes, hierarchy, instrumentation)
+        : null;
+    return new DietListener(library, hierarchy, coreTypes, typeInferrer);
   }
 
   void resolveParts() {
     List<Uri> parts = <Uri>[];
     builders.forEach((Uri uri, LibraryBuilder library) {
       if (library is SourceLibraryBuilder) {
         if (library.isPart) {
           library.validatePart();
           parts.add(uri);
         } else {
@@ skipping 218 matching lines @@
   void checkOverrides(List<SourceClassBuilder> sourceClasses) {
     assert(hierarchy != null);
     for (SourceClassBuilder builder in sourceClasses) {
       builder.checkOverrides(hierarchy);
     }
     ticker.logMs("Checked overrides");
   }
 
   List<Uri> getDependencies() => sourceBytes.keys.toList();
 }