normal	2017-03-09 06:24:24 +0900 (Thu, 09 Mar 2017)

  New Revision: 57813

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=57813

  Log:
    string.c (str_uminus): update doc for deduplication
    
    As of r57698, String#-@ can return pre-existing strings.

  Modified files:
    trunk/string.c
Index: string.c
===================================================================
--- string.c	(revision 57812)
+++ string.c	(revision 57813)
@@ -2520,8 +2520,8 @@ str_uplus(VALUE str) https://github.com/ruby/ruby/blob/trunk/string.c#L2520
  *
  * If the string is frozen, then return the string itself.
  *
- * If the string is not frozen, then duplicate the string
- * freeze it and return it.
+ * If the string is not frozen, return a frozen, possibly pre-existing
+ * copy of it.
  */
 static VALUE
 str_uminus(VALUE str)

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