class RuboCop::AST::ProcessedSource

def create_parser(ruby_version)
  builder = RuboCop::AST::Builder.new
  parser_class(ruby_version).new(builder).tap do |parser|
    # On JRuby there's a risk that we hang in tokenize() if we
    # don't set the all errors as fatal flag. The problem is caused by a bug
    # in Racc that is discussed in issue #93 of the whitequark/parser
    # project on GitHub.
    parser.diagnostics.all_errors_are_fatal = (RUBY_ENGINE != 'ruby')
    parser.diagnostics.ignore_warnings = false
    parser.diagnostics.consumer = lambda do |diagnostic|
      @diagnostics << diagnostic
    end
  end
end