dup String#rpartition return value

* string.c (rb_str_rpartition): return duplicated receiver, when
  no splits.  [ruby-core:82911] [Bug#13925]

Author:    Seiei Miyagi <hanachin@gmail.com>

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60001 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index 6cf76e4fd4..ad19595f67 100644
--- a/string.c
+++ b/string.c
@@ -9177,7 +9177,7 @@ rb_str_rpartition(VALUE str, VALUE sep)
 	pos = rb_str_rindex(str, sep, pos);
     }
     if (pos < 0) {
-	return rb_ary_new3(3, str_new_empty(str), str_new_empty(str), str);
+       return rb_ary_new3(3, str_new_empty(str), str_new_empty(str), rb_str_dup(str));
     }
     if (regex) {
 	sep = rb_reg_nth_match(0, rb_backref_get());