Made it possible to distinguish between a method or top-level function and the

runtime/vm/dart_api_impl.cc

 // 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.
 
 #include "include/dart_api.h"
 
 #include "vm/bigint_operations.h"
 #include "vm/class_finalizer.h"
 #include "vm/compiler.h"
 #include "vm/dart.h"
@@ skipping 2777 matching lines @@
   func_name = func.name();
   bool is_setter = Field::IsSetterName(func_name);
   func_name = IdentifierPrettyName(isolate, func_name);
   if (is_setter) {
     func_name = AddExternalSetterSuffix(func_name);
   }
   return Api::NewHandle(isolate, func_name.raw());
 }
 
 
-DART_EXPORT Dart_Handle Dart_FunctionEnclosingClassOrLibrary(
-    Dart_Handle function) {
+DART_EXPORT Dart_Handle Dart_FunctionOwner(Dart_Handle function) {
   Isolate* isolate = Isolate::Current();
   DARTSCOPE(isolate);
   const Function& func = Api::UnwrapFunctionHandle(isolate, function);
   if (func.IsNull()) {
     RETURN_TYPE_ERROR(isolate, function, Function);
   }
+  if (func.IsNonImplicitClosureFunction()) {
+    RawFunction* parent_function = func.parent_function();
+    return Api::NewHandle(isolate, parent_function);
+  }
   const Class& owner = Class::Handle(func.owner());
   ASSERT(!owner.IsNull());
   if (owner.IsTopLevel()) {
     // Top-level functions are implemented as members of a hidden class. We hide
     // that class here and instead answer the library.
 #if defined(DEBUG)
     const Library& lib = Library::Handle(owner.library());
     if (lib.IsNull()) {
       ASSERT(owner.IsDynamicClass() || owner.IsVoidClass());
     }
@@ skipping 1385 matching lines @@
 DART_EXPORT void Dart_InitPerfEventsSupport(Dart_FileWriterFunction function) {
   Dart::set_perf_events_writer(function);
 }
 
 
 DART_EXPORT void Dart_InitFlowGraphPrinting(Dart_FileWriterFunction function) {
   Dart::set_flow_graph_writer(function);
 }
 
 }  // namespace dart