class RSpec::Support::MethodSignature

def classify_arity(arity=@method.arity)
  if arity < 0
    # `~` inverts the one's complement and gives us the
    # number of required args
    @min_non_kw_args = ~arity
    @max_non_kw_args = INFINITY
  else
    @min_non_kw_args = arity
    @max_non_kw_args = arity
  end
end