Marcus Holland-Moritz notes that the first argument to

refcounted_he_fetch() can be NULL.

p4raw-id: //depot/perl@29884

Author: nwc10

embed.fnc

@@ -312,7 +312,7 @@ ApdR	|SV*	|hv_iterval	|NN HV* tb|NN HE* entry
 Ap	|void	|hv_ksplit	|NN HV* hv|IV newmax
 Apdbm	|void	|hv_magic	|NN HV* hv|NULLOK GV* gv|int how
 XEdpoM	|HV *	|refcounted_he_chain_2hv|NULLOK const struct refcounted_he *c
-XEpoM	|SV *	|refcounted_he_fetch|NN const struct refcounted_he *chain \
+XEpoM	|SV *	|refcounted_he_fetch|NULLOK const struct refcounted_he *chain \
 				|NULLOK SV *keysv|NULLOK const char *key \
 				|STRLEN klen, int flags, U32 hash
 dpoM	|void	|refcounted_he_free|NULLOK struct refcounted_he *he

proto.h

@@ -737,9 +737,7 @@ PERL_CALLCONV void	Perl_hv_ksplit(pTHX_ HV* hv, IV newmax)
 			__attribute__nonnull__(pTHX_1); */
 
 PERL_CALLCONV HV *	Perl_refcounted_he_chain_2hv(pTHX_ const struct refcounted_he *c);
-PERL_CALLCONV SV *	Perl_refcounted_he_fetch(pTHX_ const struct refcounted_he *chain, SV *keysv, const char *key, STRLEN klen, int flags, U32 hash)
-			__attribute__nonnull__(pTHX_1);
-
+PERL_CALLCONV SV *	Perl_refcounted_he_fetch(pTHX_ const struct refcounted_he *chain, SV *keysv, const char *key, STRLEN klen, int flags, U32 hash);
 PERL_CALLCONV void	Perl_refcounted_he_free(pTHX_ struct refcounted_he *he);
 PERL_CALLCONV struct refcounted_he *	Perl_refcounted_he_new(pTHX_ struct refcounted_he *const parent, SV *const key, SV *const value);
 PERL_CALLCONV SV**	Perl_hv_store(pTHX_ HV* tb, const char* key, I32 klen, SV* val, U32 hash);