class.c: allow nil keyword_hash

* class.c (rb_extract_keywords): treat nil keyword_hash same as 0,
  for the case rb_scan_args returns nil if no keyword hash.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44702 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 0 deletions

diff --git a/class.c b/class.c
index 25f73ecd51..2d5657d865 100644
--- a/class.c
+++ b/class.c
@@ -1912,6 +1912,8 @@ rb_get_kwargs(VALUE keyword_hash, const ID *table, int required, int optional, V
      st_delete(rb_hash_tbl_raw(keyword_hash), &key, (val)) : \
      st_lookup(rb_hash_tbl_raw(keyword_hash), key, (val)))
 
+    if (NIL_P(keyword_hash)) keyword_hash = 0;
+
     if (optional < 0) {
 	rest = 1;
 	optional = -1-optional;