lean2/tests/lean/run/coe3.lean

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import standard
namespace setoid
inductive setoid : Type :=
| mk_setoid: Π (A : Type), (A → A → Prop) → setoid
definition carrier (s : setoid)
:= setoid_rec (λ a eq, a) s
definition eqv {s : setoid} : carrier s → carrier s → Prop
:= setoid_rec (λ a eqv, eqv) s
infix `≈`:50 := eqv
coercion carrier
inductive morphism (s1 s2 : setoid) : Type :=
| mk_morphism : Π (f : s1 → s2), (∀ x y, x ≈ y → f x ≈ f y) → morphism s1 s2
set_option pp.universes true
check mk_morphism
check λ (s1 s2 : setoid), s1
check λ (s1 s2 : Type), s1
inductive morphism2 (s1 : setoid) (s2 : setoid) : Type :=
| mk_morphism2 : Π (f : s1 → s2), (∀ x y, x ≈ y → f x ≈ f y) → morphism2 s1 s2
check mk_morphism2
end