Can't use singlebyte optimization when the replacement is multibyte. [ruby-core:24612]

 * string.c (tr_trans): can't use singlebyte optimization when
          the replacement is multibyte. [ruby-core:24612]

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@24342 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 2 insertions, 1 deletions

diff --git a/string.c b/string.c
index 34f35b8b2..6e6db0053 100644
--- a/string.c
+++ b/string.c
@@ -4871,7 +4871,8 @@ tr_trans(VALUE str, VALUE src, VALUE repl, int sflag)
 	    if (r == errc) r = trrepl.now;
 	    if (c < 256) {
 		trans[c] = r;
-		if (r > 255) singlebyte = 0;
+		if (r > 255 || (r > 127 && rb_enc_mbmaxlen(enc) != 1))
+		    singlebyte = 0;
 	    }
 	    else {
 		if (!hash) hash = rb_hash_new();