[ruby-cvs:54188] nobu:r47041 (trunk): transcode.c: use string

[nobu at ruby-lang.org]

nobu	2014-08-03 10:55:32 +0900 (Sun, 03 Aug 2014)

  New Revision: 47041

  http://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=47041

  Log:
    transcode.c: use string
    
    * transcode.c (econv_opts): get rid of inadvertent ID creation,
      and preserve argument encoding in error messages.

  Modified files:
    trunk/test/ruby/test_econv.rb
    trunk/transcode.c