Re: [C++ Patch] PR 65323

[Paolo Carlini]

... in case, I think we can as well apply the below, a tad simpler. Also 
passes testing.

Paolo.
////////////////
Index: decl.c
===================================================================
--- decl.c      (revision 221230)
+++ decl.c      (working copy)
@@ -11227,11 +11227,8 @@ check_default_argument (tree decl, tree arg, tsubs
                                     LOOKUP_IMPLICIT);
   --cp_unevaluated_operand;
 
-  if (warn_zero_as_null_pointer_constant
-      && TYPE_PTR_OR_PTRMEM_P (decl_type)
-      && null_ptr_cst_p (arg)
-      && (complain & tf_warning)
-      && maybe_warn_zero_as_null_pointer_constant (arg, input_location))
+  if (TYPE_PTR_OR_PTRMEM_P (decl_type)
+      && null_ptr_cst_p (arg))
     return nullptr_node;
 
   /* [dcl.fct.default]