Drop uncompiled implicit closure functions. Only seems to happen in a few co19 tests, so this is mo…

runtime/vm/object.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 "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/cpu.h"
@@ skipping 6649 matching lines @@
     ClassFinalizer::FinalizeType(
         signature_class, signature_type, ClassFinalizer::kCanonicalize);
   }
   ASSERT(closure_function.signature_class() == signature_class.raw());
   set_implicit_closure_function(closure_function);
   ASSERT(closure_function.IsImplicitClosureFunction());
   return closure_function.raw();
 }
 
 
+void Function::DropUncompiledImplicitClosureFunction() const {
+  if (implicit_closure_function() != Function::null()) {
+    const Function& func = Function::Handle(implicit_closure_function());
+    if (!func.HasCode()) {
+      set_data(Object::null_object());
+    }
+  }
+}
+
+
 RawString* Function::UserVisibleFormalParameters() const {
   // Typically 3, 5,.. elements in 'pieces', e.g.:
   // '_LoadRequest', CommaSpace, '_LoadError'.
   GrowableHandlePtrArray<const String> pieces(Thread::Current()->zone(), 5);
   const TypeArguments& instantiator = TypeArguments::Handle();
   BuildSignatureParameters(false, kUserVisibleName, instantiator, &pieces);
   return Symbols::FromConcatAll(pieces);
 }
 
 
@@ skipping 15040 matching lines @@
   return tag_label.ToCString();
 }
 
 
 void UserTag::PrintJSONImpl(JSONStream* stream, bool ref) const {
   Instance::PrintJSONImpl(stream, ref);
 }
 
 
 }  // namespace dart