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6 lines
311 B
6 lines
311 B
data List a = Nil | Cons a (List a);
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map f xs = case xs of { Nil -> Nil; Cons x xs -> Cons (f x) (map f xs) };
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readall k = getchar (\ch -> readall (\xs -> k (Cons ch xs))) (\ch -> k Nil);
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putall x xs = case xs of { Nil -> x; Cons x xs -> putchar x (\ch -> putall x xs) };
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id x = x;
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main x = readall (putall x);
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