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-rw-r--r--embed.fnc2
1 files changed, 1 insertions, 1 deletions
diff --git a/embed.fnc b/embed.fnc
index c83c0a3927..68e5ecd6fe 100644
--- a/embed.fnc
+++ b/embed.fnc
@@ -1377,7 +1377,7 @@ EsMR |IV |invlist_search |NN SV* const invlist|const UV cp
#endif
#if defined(PERL_IN_REGCOMP_C) || defined(PERL_IN_UTF8_C)
EXpM |void |_invlist_intersection |NN SV* const a|NN SV* const b|NN SV** i
-EXpM |void |_invlist_union |NN SV* const a|NN SV* const b|NN SV** output
+EXpM |void |_invlist_union |NULLOK SV* const a|NN SV* const b|NN SV** output
EXpM |void |_invlist_subtract|NN SV* const a|NN SV* const b|NN SV** result
EXpM |void |_invlist_invert|NN SV* const invlist
EXpM |void |_invlist_invert_prop|NN SV* const invlist