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merge revision(s) 57098: [Backport #13042]

    re.c: non-regexp name reference

    * re.c (rb_reg_regsub): other than regexp has no name references.

[ruby-core:78686] [Bug #13042]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_2_2@57218 b2dd03c8-39d4-4d8f-98ff-823fe69b080e