2 files changed, 10 insertions, 0 deletions
diff --git a/ChangeLog b/ChangeLog
index bae073b40a..25665c97ee 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,3 +1,8 @@
+Wed Feb  6 01:47:39 2008  Yukihiro Matsumoto  <matz@ruby-lang.org>
+
+	* hash.c (rb_hash_flatten): do not flatten recursively by default.
+	  [ruby-dev:33603]
+
 Wed Feb  6 00:50:19 2008  NAKAMURA Usaku  <usa@ruby-lang.org>
 
 	* insns.def (adjuststack): never use INC_SP with minus value because
diff --git a/hash.c b/hash.c
index 0328d9d1aa..c3b07442ff 100644
--- a/hash.c
+++ b/hash.c
@@ -1673,6 +1673,11 @@ rb_hash_flatten(int argc, VALUE *argv, VALUE hash)
     VALUE ary;
 
     ary = rb_hash_to_a(hash);
+    if (argc == 0) {
+	argc = 1;
+	tmp = INT2FIX(1);
+	argv = &tmp;
+    }
     rb_funcall2(ary, rb_intern("flatten!"), argc, argv);
     return ary;
 }