* string.c (rb_str_substr): copy encoding although empty string.

git-svn-id: http://svn.ruby-lang.org/repos/ruby/trunk@15571 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 4 insertions, 1 deletions

diff --git a/string.c b/string.c
index 34dccb27d..fbee097e0 100644
--- a/string.c
+++ b/string.c
@@ -1242,7 +1242,10 @@ rb_str_substr(VALUE str, long beg, long len)
     else {
 	str2 = rb_str_new5(str, p, len);
 	if (len) rb_enc_cr_str_copy(str2, str);
-	else ENC_CODERANGE_SET(str2, ENC_CODERANGE_7BIT);
+	else {
+	    rb_enc_copy(str2, str);
+	    ENC_CODERANGE_SET(str2, ENC_CODERANGE_7BIT);
+	}
 	OBJ_INFECT(str2, str);
     }