parse.y: fix invalid char in eval

* parse.y (parser_yylex): fix invalid char in eval, should raise
  an syntax error too, as well as directly coded.
  [ruby-core:64243] [Bug #10117]

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47098 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
* 2014-08-08

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@47099 b2dd03c8-39d4-4d8f-98ff-823fe69b080e