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Require Import Ltac2.Ltac2.
Ltac2 check () :=
let t := Control.goal () in
match Constr.Unsafe.kind t with
| Constr.Unsafe.Prod b t =>
let na := Constr.Binder.name b in
let u := Constr.Binder.type b in
let b := Constr.Binder.make na u in
let c := Constr.Unsafe.make (Constr.Unsafe.Prod b t) in
pose (v := $c);
refine '(_ : &v);
unfold &v
| _ => fail
end.
Goal forall x : nat, x = x.
Proof.
check (); intros; reflexivity.
Qed.
Goal forall x : Type, x = x.
Proof.
check (); intros; reflexivity.
Qed.
Goal forall x : Set, x = x.
Proof.
check (); intros; reflexivity.
Qed.
Inductive True : SProp := I.
Goal forall x : True, True.
Proof.
check (); intros; constructor.
Qed.
|
