--- old/src/hotspot/share/gc/shared/genOopClosures.hpp	2020-08-24 15:28:16.370121122 +0200
+++ new/src/hotspot/share/gc/shared/genOopClosures.hpp	2020-08-24 15:28:16.190117872 +0200
@@ -104,25 +104,8 @@
 
 // Closure for scanning DefNewGeneration.
 //
-// This closure will perform barrier store calls for ALL
-// pointers in scanned oops.
-class ScanClosure: public OopsInClassLoaderDataOrGenClosure {
- private:
-  DefNewGeneration* _g;
-  HeapWord*         _boundary;
-  bool              _gc_barrier;
-  template <class T> inline void do_oop_work(T* p);
- public:
-  ScanClosure(DefNewGeneration* g, bool gc_barrier);
-  virtual void do_oop(oop* p);
-  virtual void do_oop(narrowOop* p);
-};
-
-// Closure for scanning DefNewGeneration.
-//
 // This closure only performs barrier store calls on
-// pointers into the DefNewGeneration. This is less
-// precise, but faster, than a ScanClosure
+// pointers into the DefNewGeneration.
 class FastScanClosure: public OopsInClassLoaderDataOrGenClosure {
  protected:
   DefNewGeneration* _g;
@@ -168,9 +151,8 @@
 #if INCLUDE_SERIALGC
 
 // Closure for scanning DefNewGeneration's weak references.
-// NOTE: very much like ScanClosure but not derived from
-//  OopsInGenClosure -- weak references are processed all
-//  at once, with no notion of which generation they were in.
+//  -- weak references are processed all at once,
+//  with no notion of which generation they were in.
 class ScanWeakRefClosure: public OopClosure {
  protected:
   DefNewGeneration* _g;