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fun mapX (a ::: Type) (b ::: Type) (ctx ::: {Unit}) f =
let
fun mapX' ls1 ls2 =
case (ls1, ls2) of
([], []) => <xml/>
| (x1 :: ls1, x2 :: ls2) => <xml>{f x1 x2}{mapX' ls1 ls2}</xml>
| _ => error <xml>ListPair.mapX: Unequal list lengths</xml>
in
mapX'
end
|
