Typecheck const classes in the context of the constructor call.

pkg/compiler/lib/src/js_backend/constant_handler_javascript.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.
 
 part of js_backend;
 
 /// [ConstantCompilerTask] for compilation of constants for the JavaScript
 /// backend.
 ///
 /// Since this task needs to distinguish between frontend and backend constants
@@ skipping 26 matching lines @@
   }
 
   @override
   ConstantExpression getConstantForVariable(VariableElement element) {
     return dartConstantCompiler.getConstantForVariable(element);
   }
 
   @override
   ConstantExpression compileConstant(VariableElement element) {
     return measure(() {
+      // TODO(het): Only report errors from one of the constant compilers
       ConstantExpression result = dartConstantCompiler.compileConstant(element);
       jsConstantCompiler.compileConstant(element);
       return result;
     });
   }
 
   @override
   void evaluate(ConstantExpression constant) {
     return measure(() {
       dartConstantCompiler.evaluate(constant);
@@ skipping 62 matching lines @@
 
   // Constants computed for metadata.
   final Map<MetadataAnnotation, ConstantExpression> metadataConstantMap =
       new Map<MetadataAnnotation, ConstantExpression>();
 
   JavaScriptConstantCompiler(Compiler compiler)
       : super(compiler, JAVA_SCRIPT_CONSTANT_SYSTEM);
 
   ConstantExpression compileVariableWithDefinitions(VariableElement element,
                                           TreeElements definitions,
-                                          {bool isConst: false}) {
+                                          {bool isConst: false,
+                                           bool checkType: true}) {
     if (!isConst && lazyStatics.contains(element)) {
       return null;
     }
     ConstantExpression value = super.compileVariableWithDefinitions(
-        element, definitions, isConst: isConst);
+        element, definitions, isConst: isConst, checkType: checkType);
     if (!isConst && value == null) {
       lazyStatics.add(element);
     }
     return value;
   }
 
   void addCompileTimeConstantForEmission(ConstantValue constant) {
     compiledConstants.add(constant);
   }
 
@@ skipping 143 matching lines @@
     // TODO(ahe): This doesn't belong here. Rename this class and generalize.
     var closureClassMap =
         constants.compiler.closureToClassMapper.closureMappingCache
         .remove(node);
     if (closureClassMap != null) {
       closureClassMap.removeMyselfFrom(
           constants.compiler.enqueuer.codegen.universe);
     }
   }
 }