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Inductive type : Set :=
Tptr : type -> type
| Tref : type -> type
| Trv_ref : type -> type
| Tint : type -> type -> type
| Tvoid : type
| Tarray : type -> type -> type
| Tnamed : type -> type
| Tfunction : type -> type -> type -> type
| Tbool : type
| Tmember_pointer : type -> type -> type
| Tfloat : type -> type
| Tqualified : type -> type -> type
| Tnullptr : type
| Tarch : type -> type -> type
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Definition type_eq_dec : forall (ty1 ty2 : type), { ty1 = ty2 } + { ty1 <> ty2 }.
Proof. fix IHty1 1. decide equality. Defined.
Goal (if type_eq_dec (Tptr Tvoid) (Tptr Tvoid) then True else False).
Proof.
timeout 1 cbn.
constructor.
Qed.
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