Don’t exit prematurely if compilation failed.

dart/pkg/compiler/lib/src/js_backend/backend.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 js_backend;
 
 const VERBOSE_OPTIMIZER_HINTS = false;
 
 const bool USE_CPS_IR = const bool.fromEnvironment("USE_CPS_IR");
 
@@ skipping 1182 matching lines @@
     registerBackendUse(cls);
     helpersUsed.add(cls.declaration);
     if (cls.declaration != cls.implementation) {
       helpersUsed.add(cls.implementation);
     }
     enqueuer.registerInstantiatedClass(cls, registry);
   }
 
   void codegen(CodegenWorkItem work) {
     Element element = work.element;
+    if (compiler.elementHasCompileTimeError(element)) {
+      generatedCode[element] = jsAst.js(
+          "function () { throw new Error('Compile time error in $element') }");
+      return;
+    }
     var kind = element.kind;
     if (kind == ElementKind.TYPEDEF) return;
     if (element.isConstructor && element.enclosingClass == jsNullClass) {
       // Work around a problem compiling JSNull's constructor.
       return;
     }
     if (kind.category == ElementCategory.VARIABLE) {
       ConstantExpression initialValue =
           constants.getConstantForVariable(element);
       if (initialValue != null) {
@@ skipping 1297 matching lines @@
   }
 }
 
 /// Records that [constant] is used by the element behind [registry].
 class Dependency {
   final ConstantValue constant;
   final Element annotatedElement;
 
   const Dependency(this.constant, this.annotatedElement);
 }