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T17773.hs:16:22: error:
• Found hole: _Refl :: Mzero x y :~: (x <|> y)
Where: ‘x’, ‘f’, ‘k’, ‘a’, ‘y’ are rigid type variables bound by
the type signature for:
monadPlusMplus :: forall {k} (f :: k -> *) (a :: k) (x :: f a)
(y :: f a).
Proxy x -> Proxy y -> Mzero x y :~: (x <|> y)
at T17773.hs:(13,1)-(15,41)
Or perhaps ‘_Refl’ is mis-spelled, or not in scope
• In an equation for ‘monadPlusMplus’: monadPlusMplus _ _ = _Refl
• Relevant bindings include
monadPlusMplus :: Proxy x -> Proxy y -> Mzero x y :~: (x <|> y)
(bound at T17773.hs:16:1)
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