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merge revision(s) 40606,40607,40635: [Backport #8375]

    test_scanner_events.rb: assert_location

    * test/ripper/test_scanner_events.rb (TestRipper#assert_location):

rename so skipped in backtraces.
* parse.y (parser_yylex): fail if $, @, @@ are not followed by a valid
name character. [ruby-core:54846] [Bug #8375].

    * parse.y (parser_peek_variable_name): treat invalid global, class,
      and instance variable names as mere strings rather than errors.
      [ruby-core:54885] [Bug #8375]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/branches/ruby_1_9_3@42462 b2dd03c8-39d4-4d8f-98ff-823fe69b080e