1 files changed, 6 insertions, 0 deletions
diff --git a/proto.h b/proto.h
index 17fbdd8732..1a4e5719b9 100644
--- a/proto.h
+++ b/proto.h
@@ -23,6 +23,12 @@ PERL_CALLCONV int	Perl_Gv_AMupdate(pTHX_ HV* stash, bool destructing)
 	assert(stash)
 
 PERL_CALLCONV const char *	Perl_PerlIO_context_layers(pTHX_ const char *mode);
+PERL_CALLCONV bool	Perl__is_utf8__perl_idstart(pTHX_ const U8 *p)
+			__attribute__warn_unused_result__
+			__attribute__nonnull__(pTHX_1);
+#define PERL_ARGS_ASSERT__IS_UTF8__PERL_IDSTART	\
+	assert(p)
+
 PERL_CALLCONV UV	Perl__to_uni_fold_flags(pTHX_ UV c, U8 *p, STRLEN *lenp, U8 flags)
 			__attribute__nonnull__(pTHX_2)
 			__attribute__nonnull__(pTHX_3);