dup String#split return value

* string.c (rb_str_split): return duplicated receiver, when no
  splits.  patched by tompng (tomoya ishida) in [ruby-core:82911],
  and the test case by Seiei Miyagi <hanachin@gmail.com>.
  [Bug#13925] [Fix GH-1705]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60002 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index ad19595f67..7e7ae7f0a8 100644
--- a/string.c
+++ b/string.c
@@ -7371,7 +7371,7 @@ rb_str_split_m(int argc, VALUE *argv, VALUE str)
 	else if (lim == 1) {
 	    if (RSTRING_LEN(str) == 0)
 		return rb_ary_new2(0);
-	    return rb_ary_new3(1, str);
+	    return rb_ary_new3(1, rb_str_dup(str));
 	}
 	i = 1;
     }