DDC fixes on DDC

lib/src/options.dart

 // Copyright (c) 2014, 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.
 
 /// Set of flags and options passed to the compiler
 library ddc.src.options;
 
 import 'dart:io';
 
 import 'package:args/args.dart';
@@ skipping 36 matching lines @@
   /// Note: this option is experimental will be removed once we have a proper
   /// implementation of inference in the future, which should handle all
   /// ordering concerns.
   final bool inferInNonStableOrder;
 
   /// Restrict inference of fields and top-levels to those that are final and
   /// const.
   final bool onlyInferConstsAndFinalFields;
 
   ResolverOptions({this.useMultiPackage: false, this.packageRoot: 'packages/',
-      this.packagePaths: const [], this.inferFromOverrides: true,
+      this.packagePaths: const <String>[], this.inferFromOverrides: true,
       this.inferStaticsFromIdentifiers: false,
       this.inferInNonStableOrder: false,
       this.onlyInferConstsAndFinalFields: false});
 }
 
 // TODO(vsm): Merge RulesOptions and TypeOptions
 /// Options used by ddc's RestrictedRules.
 class RulesOptions extends TypeOptions {
   /// Whether to allow casts in constant contexts.
   final bool allowConstCasts;
@@ skipping 112 matching lines @@
   @override
   final bool ignoreTypes;
 
   CompilerOptions({this.allowConstCasts: true, this.checkSdk: false,
       this.dumpInfo: false, this.dumpInfoFile, this.dumpSrcDir,
       this.forceCompile: false, this.formatOutput: false,
       this.cheapTestFormat: false, this.ignoreTypes: false, this.outputDir,
       this.outputDart: false, this.useColors: true,
       this.covariantGenerics: true, this.relaxedCasts: true,
       this.useMultiPackage: false, this.packageRoot: 'packages/',
-      this.packagePaths: const [], this.inferFromOverrides: true,
+      this.packagePaths: const <String>[], this.inferFromOverrides: true,
       this.inferStaticsFromIdentifiers: false,
       this.inferInNonStableOrder: false,
       this.onlyInferConstsAndFinalFields: false,
       this.nonnullableTypes: TypeOptions.NONNULLABLE_TYPES, this.help: false,
       this.useMockSdk: false, this.dartSdkPath, this.logLevel: Level.SEVERE,
       this.entryPointFile: null});
 }
 
 /// Parses options from the command-line
 CompilerOptions parseOptions(List<String> argv) {
@@ skipping 88 matching lines @@
   ..addFlag('help', abbr: 'h', help: 'Display this message')
   ..addFlag('force-compile',
       help: 'Compile code with static errors', defaultsTo: false)
   ..addOption('log', abbr: 'l', help: 'Logging level', defaultsTo: 'severe')
   ..addFlag('dump-info',
       abbr: 'i', help: 'Dump summary information', defaultsTo: false)
   ..addOption('dump-info-file',
       abbr: 'f',
       help: 'Dump info json file (requires dump-info)',
       defaultsTo: null);