mirror of
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32 lines
661 B
Idris
32 lines
661 B
Idris
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%default total
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data X : Type -> Type -> Type where
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B : b -> X a b
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R : X a b -> X b c -> X a c
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[WithFunction] Functor (X a) where
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map f $ B x = B $ f x
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map f $ R x y = R x (map f y)
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[WithInfix] Functor (X a) where
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map f $ B x = B $ f x
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map f $ R x y = R x (f <$> y)
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[WithFoldMap] Foldable (X a) where
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foldr = ?some_foldr_1
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foldMap f $ B x = f x
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foldMap f rlr@(R l r) = do
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let r' = map @{WithFunction} f r
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foldMap id $ assert_smaller rlr r'
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[WithConcat] Foldable (X a) where
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foldr = ?some_foldr_2
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foldMap f $ B x = f x
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foldMap f rlr@(R l r) = do
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let r' = map @{WithFunction} f r
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concat $ assert_smaller rlr r'
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