Alternative fix for the js-interop crash.

pkg/compiler/lib/src/dart2js.dart

 // Copyright (c) 2013, 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 dart2js.cmdline;
 
 import 'dart:async'
     show Future, EventSink;
 import 'dart:convert' show UTF8, LineSplitter;
 import 'dart:io'
@@ skipping 101 matching lines @@
   bool explicitOut = false;
   bool wantHelp = false;
   bool wantVersion = false;
   String outputLanguage = 'JavaScript';
   bool stripArgumentSet = false;
   bool analyzeOnly = false;
   bool analyzeAll = false;
   bool dumpInfo = false;
   bool allowNativeExtensions = false;
   bool trustTypeAnnotations = false;
+  bool trustJSInteropTypeAnnotations = false;
   bool checkedMode = false;
   // List of provided options that imply that output is expected.
   List<String> optionsImplyCompilation = <String>[];
   bool hasDisallowUnsafeEval = false;
   // TODO(johnniwinther): Measure time for reading files.
   SourceFileProvider inputProvider = new CompilerSourceFileProvider();
   diagnosticHandler = new FormattingDiagnosticHandler(inputProvider);
   Map<String, dynamic> environment = new Map<String, dynamic>();
 
   passThrough(String argument) => options.add(argument);
@@ skipping 88 matching lines @@
   setDumpInfo(String argument) {
     implyCompilation(argument);
     dumpInfo = true;
   }
 
   setTrustTypeAnnotations(String argument) {
     trustTypeAnnotations = true;
     implyCompilation(argument);
   }
 
+  setTrustJSInteropTypeAnnotations(String argument) {
+    trustJSInteropTypeAnnotations = true;
+    implyCompilation(argument);
+  }
+
   setTrustPrimitives(String argument) {
     implyCompilation(argument);
   }
 
   setCheckedMode(String argument) {
     checkedMode = true;
     passThrough(argument);
   }
 
   addInEnvironment(String argument) {
@@ skipping 79 matching lines @@
     new OptionHandler(Flags.enableDiagnosticColors,
                       (_) => diagnosticHandler.enableColors = true),
     new OptionHandler('--enable[_-]checked[_-]mode|--checked',
                       (_) => setCheckedMode(Flags.enableCheckedMode)),
     new OptionHandler(Flags.trustTypeAnnotations,
                       (_) => setTrustTypeAnnotations(
                           Flags.trustTypeAnnotations)),
     new OptionHandler(Flags.trustPrimitives,
                       (_) => setTrustPrimitives(
                           Flags.trustPrimitives)),
+    new OptionHandler(Flags.trustJSInteropTypeAnnotations,
+                      (_) => setTrustJSInteropTypeAnnotations(
+                          Flags.trustJSInteropTypeAnnotations)),
     new OptionHandler(r'--help|/\?|/h', (_) => wantHelp = true),
     new OptionHandler('--packages=.+', setPackageConfig),
     new OptionHandler('--package-root=.+|-p.+', setPackageRoot),
     new OptionHandler(Flags.analyzeAll, setAnalyzeAll),
     new OptionHandler(Flags.analyzeOnly, setAnalyzeOnly),
     new OptionHandler(Flags.noSourceMaps, passThrough),
     new OptionHandler(Flags.analyzeSignaturesOnly, setAnalyzeOnly),
     new OptionHandler(Flags.disableNativeLiveTypeAnalysis, passThrough),
     new OptionHandler('--categories=.*', setCategories),
     new OptionHandler(Flags.disableTypeInference, implyCompilation),
@@ skipping 418 matching lines @@
       } else if (exitCode == 253) {
         print(">>> TEST CRASH");
       } else {
         print(">>> TEST FAIL");
       }
       stderr.writeln(">>> EOF STDERR");
       subscription.resume();
     });
   });
 }