string.c: ASCII-incompatible is not ASCII only

* string.c (tr_trans): ASCII-incompatible encoding strings cannot
  be ASCII-only even if valid.  [ruby-core:83056] [Bug #13950]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@60060 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 1 deletions

diff --git a/string.c b/string.c
index 7e7ae7f0a8..e1bd9a052e 100644
--- a/string.c
+++ b/string.c
@@ -6637,7 +6637,7 @@ tr_trans(VALUE str, VALUE src, VALUE repl, int sflag)
 	}
     }
 
-    if (cr == ENC_CODERANGE_VALID)
+    if (cr == ENC_CODERANGE_VALID && rb_enc_asciicompat(e1))
 	cr = ENC_CODERANGE_7BIT;
     str_modify_keep_cr(str);
     s = RSTRING_PTR(str); send = RSTRING_END(str);