naruse	2018-09-30 02:49:33 +0900 (Sun, 30 Sep 2018)

  New Revision: 64887

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64887

  Log:
    no-op if it is T_STRING

  Modified files:
    trunk/re.c
Index: re.c
===================================================================
--- re.c	(revision 64886)
+++ re.c	(revision 64887)
@@ -3084,6 +3084,9 @@ reg_operand(VALUE s, int check) https://github.com/ruby/ruby/blob/trunk/re.c#L3084
     if (SYMBOL_P(s)) {
 	return rb_sym2str(s);
     }
+    else if (RB_TYPE_P(s, T_STRING)) {
+        return s;
+    }
     else {
         return check ? rb_str_to_str(s) : rb_check_string_type(s);
     }

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