Use the typedef arity to know how to invoke a closure given by the dom.

dart/lib/compiler/implementation/native_handler.dart

Index: dart/lib/compiler/implementation/native_handler.dart
===================================================================
--- dart/lib/compiler/implementation/native_handler.dart	(revision 8049)
+++ dart/lib/compiler/implementation/native_handler.dart	(working copy)
@@ -215,12 +215,13 @@
     return;
   }
 
-  HInstruction convertDartClosure(Element parameter) {
+  HInstruction convertDartClosure(Element parameter, Type type) {
     HInstruction local = builder.localsHandler.readLocal(parameter);
-    // TODO(ngeoffray): by better analyzing the function type and
-    // its formal parameters, we could pass a method with a defined arity.
+    // TODO(ngeoffray): for static methods, we could pass a method with a

[kasperl, 2012/05/29 12:16:24]

for -> For

[ngeoffray, 2012/05/29 12:31:01]

Done.

+    // defined arity.
     builder.push(new HStatic(builder.interceptors.getClosureConverter()));
-    List<HInstruction> callInputs = <HInstruction>[builder.pop(), local];
+    HInstruction arity = builder.graph.addConstantInt(type.arity());
+    List<HInstruction> callInputs = <HInstruction>[builder.pop(), local, arity];
     HInstruction closure = new HInvokeStatic(Selector.INVOCATION_1, callInputs);
     builder.add(closure);
     return closure;
@@ -265,7 +266,7 @@
     parameters.forEachParameter((Element parameter) {
       Type type = parameter.computeType(compiler);
       HInstruction input = builder.localsHandler.readLocal(parameter);
-      if (type is FunctionType) input = convertDartClosure(parameter);
+      if (type is FunctionType) input = convertDartClosure(parameter, type);
       inputs.add(input);
       arguments.add('#');
     });
@@ -296,7 +297,7 @@
     parameters.forEachParameter((Element parameter) {
       Type type = parameter.computeType(compiler);
       if (type is FunctionType) {
-        HInstruction jsClosure = convertDartClosure(parameter);
+        HInstruction jsClosure = convertDartClosure(parameter, type);
         // Because the JS code references the argument name directly,
         // we must keep the name and assign the JS closure to it.
         builder.add(new HForeign(