def add_lint(node_or_line_or_location, message)
      @lints << Lint.new(self,
                         engine.filename,
                         extract_location(node_or_line_or_location),
                         message,
                         @config.fetch('severity', :warning).to_sym)
    end
def add_lint(node_or_line_or_location, message)
      @lints << Lint.new(self,
                         engine.filename,
                         extract_location(node_or_line_or_location),
                         message,
                         @config.fetch('severity', :warning).to_sym)
    end
Helper for creating lint from a parse tree node

 @param node_or_line_or_location [Sass::Script::Tree::Node, Fixnum,
                                  SCSSLint::Location, Sass::Source::Position]
 @param message [String]