merge revision(s) 62040: [Backport #14388]

	string.c: clear substring code range

	* string.c (str_substr): substring of broken code range string may
	  be valid or broken.  patch by tommy (Masahiro Tomita) at
	  [ruby-dev:50430] [Bug #14388].

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_3@62946 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

1 files changed, 1 insertions, 0 deletions

diff --git a/string.c b/string.c
index 84533e7efe..0021c53e3a 100644
--- a/string.c
+++ b/string.c
@@ -2287,6 +2287,7 @@ rb_str_substr(VALUE str, long beg, long len)
 	str2 = str_new_shared(rb_obj_class(str2), str2);
 	RSTRING(str2)->as.heap.ptr += ofs;
 	RSTRING(str2)->as.heap.len = len;
+	ENC_CODERANGE_CLEAR(str2);
     }
     else {
 	str2 = rb_str_new_with_class(str, p, len);