merges r20103 from trunk into ruby_1_9_1.

* array.c (rb_ary_join): do not repeat self in a recursive array.
  [ruby-dev:37019]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/branches/ruby_1_9_1@20111 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/array.c b/array.c
index 2f5a194e8..5553b8ff2 100644
--- a/array.c
+++ b/array.c
@@ -1487,7 +1487,10 @@ rb_ary_join(VALUE ary, VALUE sep)
 	  case T_STRING:
 	    break;
 	  case T_ARRAY:
-	    {
+	    if (tmp == ary) {
+		tmp = rb_usascii_str_new2("[...]");
+	    }
+	    else {
 		VALUE args[2];
 
 		args[0] = tmp;