{-# LANGUAGE NoImplicitPrelude #-}
{-# LANGUAGE FlexibleInstances #-}

module Data.Aviation.Units.Millimetres(
  Millimetres(millimetres)
) where

import Control.Category(id)
import Control.Lens(Iso')
import Prelude(Rational)

class Millimetres a where
  millimetres ::
    Iso' Rational a

instance Millimetres Rational where
  millimetres =
    id