* hash.c (replace_i): ignore when key == Qundef.

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@1488 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 7a08b0d500..2d99df3ce0 100644
--- a/hash.c
+++ b/hash.c
@@ -510,7 +510,10 @@ static int
 replace_i(key, val, hash)
     VALUE key, val, hash;
 {
-    rb_hash_aset(hash, key, val);
+    if (key != Qundef) {
+	rb_hash_aset(hash, key, val);
+    }
+
     return ST_CONTINUE;
 }