parse.y: Ripper.sexp returns error
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48144 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
parse.y: Ripper.sexp returns error
return nil on error. [ruby-dev:48678] [Bug #10405]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@48144 b2dd03c8-39d4-4d8f-98ff-823fe69b080e