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21 lines
439 B
Plaintext
21 lines
439 B
Plaintext
Pair : Type -> Type -> Type
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Pair A B = sig { p1 : A; p2 : B }
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pair : (A:Type) -> (B:Type) -> A -> B -> Pair A B
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pair _ _ x y = rec { p1 = x; p2 = y }
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fst : (A:Type) -> (B:Type) -> Pair A B -> A
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fst _ _ p = case p of Pair _ _ x _ -> x
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snd : (A:Type) -> (B:Type) -> Pair A B -> B
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snd _ _ p = case p of Pair _ _ x _ -> x
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{-
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syntax:
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(x1,...,xn) => { p1 = e1; ... ; pn = en }
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where n >= 2 and x1,...,xn are expressions or patterns
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-} |