Created
January 15, 2015 11:11
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| (* 13.5 *) | |
| let twice f = let g x = f (f x) in g | |
| let f = twice twice | |
| (* できあがった関数は渡された関数を4回繰り返したものになる *) | |
| (* val f : ('_a -> '_a) -> '_a -> '_a = <fun> *) |
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