[ruby-cvs:66519] nobu:r59341 (trunk): parse.y: refine error messages

[nobu at ruby-lang.org]

nobu	2017-07-15 17:29:03 +0900 (Sat, 15 Jul 2017)

  New Revision: 59341

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=59341

  Log:
    parse.y: refine error messages
    
    * parse.y (parser_read_escape, parser_tok_hex): refine error
      messages.  point from the backslash up to the invalid char.

  Modified files:
    trunk/parse.y
    trunk/test/ruby/test_parse.rb