code: def match_in_kwargs(self, match_args, kwargs):
          
          for match, default in match_args:
              names = get_match_names(match)
              if names:
                  tempvar = self.get_temp_var()
                  self.add_def(
                      tempvar + " = "
                      + "".join(
                          kwargs + '.pop("' + name + '") if "' + name + '" in ' + kwargs + " else "
                          for name in names
                      )
                      + default,
                  )
                  with self.down_a_level():
                      self.match(match, tempvar)
              else:
                  raise CoconutDeferredSyntaxError("keyword-only pattern-matching function arguments must have names", self.loc)
docs: Matches against kwargs.