Introduce the TYPEDEF element, and use it in order to catch passing closures to the DOM. I make the…

frog/leg/ssa/builder.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.
 
 class Interceptors {
   Compiler compiler;
   Interceptors(Compiler this.compiler);
 
   SourceString mapOperatorToMethodName(Operator op) {
     String name = op.source.stringValue;
@@ skipping 76 matching lines @@
   }
 
   Element getEqualsNullInterceptor() {
     return compiler.findHelper(const SourceString('eqNull'));
   }
 
   Element getExceptionUnwrapper() {
     return compiler.findHelper(const SourceString('unwrapException'));
   }
 
+  Element getClosureConverter() {
+    return compiler.findHelper(const SourceString('convertDartClosureToJS'));
+  }
+
   Element getTraceFromException() {
     return compiler.findHelper(const SourceString('getTraceFromException'));
   }
 
   Element getEqualsInterceptor() {
     return compiler.findHelper(const SourceString('eq'));
   }
 
   Element getMapMaker() {
     return compiler.findHelper(const SourceString('makeLiteralMap'));
@@ skipping 2373 matching lines @@
     // Normally, we would call [close] here. However, then we hit
     // another unimplemented feature: aborting loop body. Simply
     // calling [add] does not work as it asserts that the instruction
     // isn't a control flow instruction. So we inline parts of [add].
     current.addAfter(current.last, new HThrow(message));
     if (isExpression) {
       stack.add(graph.addConstantNull());
     }
   }
 }