[ruby-cvs:69228] nobu:r62047 (trunk): optparse.rb: froze string literals

[nobu at ruby-lang.org]

nobu	2018-01-26 12:41:04 +0900 (Fri, 26 Jan 2018)

  New Revision: 62047

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=62047

  Log:
    optparse.rb: froze string literals

  Modified files:
    trunk/lib/optparse.rb
    trunk/test/optparse/test_summary.rb