    # File bin/el4r-instance, line 510
        def el(expression)
          case expression
          when Symbol; ELExpression.new(El4r.name_rb2el(expression.to_s))
          when String; ELExpression.new(expression)
          when ELExpression; expression
          else
            raise(TypeError,
                  "Cannot treat as lisp expression: <#{expression.inspect}>")
          end
        end