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