nobu	2017-09-30 09:01:23 +0900 (Sat, 30 Sep 2017)

  New Revision: 60066

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=60066

  Log:
    string.c: fix ASCII-only on succ
    
    * string.c (str_succ): clear coderange cache when no alpha-numeric
      character case, carried part may become ASCII-only.
      [ruby-core:83062] [Bug #13952]

  Modified files:
    trunk/string.c
    trunk/test/ruby/test_string.rb
Index: test/ruby/test_string.rb
===================================================================
--- test/ruby/test_string.rb	(revision 60065)
+++ test/ruby/test_string.rb	(revision 60066)
@@ -1872,6 +1872,11 @@ CODE https://github.com/ruby/ruby/blob/trunk/test/ruby/test_string.rb#L1872
 
     assert_equal("!", " ".succ)
     assert_equal("", "".succ)
+
+    bug = '[ruby-core:83062] [Bug #13952]'
+    s = "\xff".b
+    assert_not_predicate(s, :ascii_only?)
+    assert_predicate(s.succ, :ascii_only?, bug)
   end
 
   def test_succ!
Index: string.c
===================================================================
--- string.c	(revision 60065)
+++ string.c	(revision 60066)
@@ -4079,6 +4079,7 @@ str_succ(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L4079
             }
             carry_pos = s - sbeg;
 	}
+	ENC_CODERANGE_SET(str, ENC_CODERANGE_UNKNOWN);
     }
     RESIZE_CAPA(str, slen + carry_len);
     sbeg = RSTRING_PTR(str);

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