code: def t_less_variable(self, t):
          r'@@?[\w-]+|@\{[^@\}]+\}'
          v = t.value.lower()
          if v in reserved.tokens:
              t.type = reserved.tokens[v]
              if t.type == "css_media":
                  t.lexer.push_state("mediaquery")
              elif t.type == "css_import":
                  t.lexer.push_state("import")
          return f t_less_variable(self, t):
          r'@@?[\w-]+|@\{[^@\}]+\}'
          v = t.value.lower()
          if v in reserved.tokens:
              t.type = reserved.tokens[v]
              if t.type == "css_media":
                  t.lexer.push_state("mediaquery")
              elif t.type == "css_import":
                  t.lexer.push_state("import")
          return t
docs: r'@@?[\w-]+|@\{[^@\}]+\}