21 lines
384 B
Text
21 lines
384 B
Text
structure Functor (A : Type) :=
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(fn : A → A → A) (inj : ∀ x y, fn x = fn y → x = y)
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definition coe_functor_to_fn [instance] (A : Type) : has_coe_to_fun (Functor A) :=
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has_coe_to_fun.mk (A → A → A) Functor.fn
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constant f : Functor nat
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check f 0 1
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set_option pp.coercions false
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check f 0 1
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set_option pp.coercions true
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check f 0 1
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set_option pp.all true
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check f 0 1
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