Support runtime check of function types.

sdk/lib/_internal/compiler/implementation/resolution/members.dart

Index: sdk/lib/_internal/compiler/implementation/resolution/members.dart
diff --git a/sdk/lib/_internal/compiler/implementation/resolution/members.dart b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
index 6b556374ca1e773c34a3d21580f97f8bfc1e84b2..fd810740626457c69741c7782479c2142f11c3ad 100644
--- a/sdk/lib/_internal/compiler/implementation/resolution/members.dart
+++ b/sdk/lib/_internal/compiler/implementation/resolution/members.dart
@@ -1963,6 +1963,10 @@ class ResolverVisitor extends CommonResolverVisitor<Element> {
     scope = oldScope;
     enclosingElement = previousEnclosingElement;
 
+    ClassElement thisClass = enclosingElement.getEnclosingClass();

[ngeoffray, 2013/03/13 09:30:46]

Please add a comment.

[Johnni Winther, 2013/03/22 07:30:24]

Changed to use the type of [function] itself, thus registering the function if
is uses type variables.

+    if (thisClass != null && !thisClass.typeVariables.isEmpty) {
+      world.registerGenericClosure(function, mapping);
+    }
     world.registerInstantiatedClass(compiler.functionClass, mapping);
   }