[ruby-cvs:72497] naruse:r65397 (trunk): fix test

[naruse at ruby-lang.org]

naruse	2018-10-28 08:15:43 +0900 (Sun, 28 Oct 2018)

  New Revision: 65397

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65397

  Log:
    fix test

  Modified files:
    trunk/test/ruby/test_backtrace.rb