Let the dart2dart compiler stop in case of failure.

pkg/compiler/lib/src/compiler.dart

 // Copyright (c) 2012, 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.
 
 part of dart2js;
 
 /**
  * If true, print a warning for each method that was resolved, but not
  * compiled.
  */
@@ skipping 260 matching lines @@
   }
   native.NativeEnqueuer nativeCodegenEnqueuer(world) {
     return new native.NativeEnqueuer();
   }
 
   /// Generates the output and returns the total size of the generated code.
   int assembleProgram();
 
   List<CompilerTask> get tasks;
 
+  bool get canHandleCompilationFailed;
+
   void onResolutionComplete() {}
 
   ItemCompilationContext createItemCompilationContext() {
     return new ItemCompilationContext();
   }
 
   bool classNeedsRti(ClassElement cls);
   bool methodNeedsRti(FunctionElement function);
 
   /// Called during codegen when [constant] has been used.
@@ skipping 1276 matching lines @@
           kind = MessageKind.HIDDEN_WARNINGS;
         }
         reportDiagnostic(null,
             kind.message({'warnings': info.warnings,
                           'hints': info.hints,
                           'uri': uri},
                          terseDiagnostics),
             api.Diagnostic.HINT);
       });
     }
+
+    // TODO(sigurdm): The dart backend should handle failed compilations.
+    if (compilationFailed && !backend.canHandleCompilationFailed) {
+      return;
+    }
+
     if (analyzeOnly) {
       if (!analyzeAll && !compilationFailed) {
         // No point in reporting unused code when [analyzeAll] is true: all
         // code is artificially used.
         // If compilation failed, it is possible that the error prevents the
         // compiler from analyzing all the code.
         reportUnusedCode();
       }
       return;
     }
@@ skipping 801 matching lines @@
   InterfaceType get nullType => nullClass.computeType(compiler);
 
   @override
   InterfaceType get numType => numClass.computeType(compiler);
 
   @override
   InterfaceType get stringType =>  stringClass.computeType(compiler);
 }
 
 typedef void InternalErrorFunction(Spannable location, String message);