Ensure result encoding is the same as input encoding for String#gsub. [Bug #4340].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@30806 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index 1270f502a8..bef9cb93fd 100644
--- a/string.c
+++ b/string.c
@@ -3745,6 +3745,7 @@ str_gsub(int argc, VALUE *argv, VALUE str, int bang)
     slen = RSTRING_LEN(str);
     cp = sp;
     str_enc = STR_ENC_GET(str);
+    rb_enc_associate(dest, str_enc);
 
     do {
 	n++;