diff -rupN ruby-1.8.6-p287/eval.c ../ruby-1.8.6-p287/eval.c
--- ruby-1.8.6-p287/eval.c	2008-08-04 10:16:55.000000000
+++ ../ruby-1.8.6-p287/eval.c	2009-03-28 19:52:45.000000000
@@ -8629,6 +8629,7 @@ proc_invoke(proc, args, self, klass)
         scope->local_tbl = _block.scope->local_tbl;
         scope->local_vars = _block.scope->local_vars;
         scope->flags |= SCOPE_CLONE;
+        scope->flags |= (_block.scope->flags & SCOPE_MALLOC);
         _block.scope = scope;
     }
     /* modify current frame */
diff -rupN ruby-1.8.6-p287/gc.c ../ruby-1.8.6-p287/gc.c
--- ruby-1.8.6-p287/gc.c	2008-08-04 10:16:55.000000000
+++ ../ruby-1.8.6-p287/gc.c	2009-03-28 18:53:12.000000000
@@ -1270,7 +1270,7 @@ obj_free(obj)
 	    VALUE *vars = RANY(obj)->as.scope.local_vars-1;
 	    if (!(RANY(obj)->as.scope.flags & SCOPE_CLONE) && vars[0] == 0)
 		RUBY_CRITICAL(free(RANY(obj)->as.scope.local_tbl));
-	    if (RANY(obj)->as.scope.flags & SCOPE_MALLOC)
+	    if (RANY(obj)->as.scope.flags & SCOPE_MALLOC && !(RANY(obj)->as.scope.flags & SCOPE_CLONE))
 		RUBY_CRITICAL(free(vars));
 	}
 	break;