hash.c: fix segv in Hash#replace

* hash.c (rb_hash_replace): fix segv on `{}.replace({})` introduced
  in r44060 [Bug #9230] [ruby-core:58991]
* test/ruby/test_hash.rb: regression test for above

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@44096 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/hash.c b/hash.c
index 53d70f9fe7..a6944770a6 100644
--- a/hash.c
+++ b/hash.c
@@ -1414,7 +1414,7 @@ rb_hash_replace(VALUE hash, VALUE hash2)
     table2 = RHASH(hash2)->ntbl;
 
     rb_hash_clear(hash);
-    hash_tbl(hash)->type = table2->type;
+    if (table2) hash_tbl(hash)->type = table2->type;
     rb_hash_foreach(hash2, replace_i, hash);
 
     return hash;