--- a/src/hotspot/share/code/nmethod.hpp	Fri Mar 15 18:59:21 2019 +0100
+++ b/src/hotspot/share/code/nmethod.hpp	Fri Mar 15 16:00:18 2019 -0400
@@ -591,7 +591,7 @@
   static int osr_entry_point_offset()             { return offset_of(nmethod, _osr_entry_point); }
   static int state_offset()                       { return offset_of(nmethod, _state); }
 
-  virtual void metadata_do(void f(Metadata*));
+  virtual void metadata_do(MetadataClosure* f);
 
   NativeCallWrapper* call_wrapper_at(address call) const;
   NativeCallWrapper* call_wrapper_before(address return_pc) const;