File: deftwice.v

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coq 8.6-4
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Class C (A : Type) := c : A -> Type.

Record Inhab (A : Type) := { witness : A }. 

Instance inhab_C : C Type := Inhab.

Variable full : forall A (X : C A), forall x : A, c x.

Definition truc {A : Type} : Inhab A := (full _ _ _).