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Require Import TestSuite.admit.
Fixpoint exp (n : nat) (T : Set)
:= match n with
| 0 => T
| S n' => exp n' (T * T)
end.
Definition big := Eval compute in exp 13 nat.
Module NonPrim.
Unset Primitive Projections.
Record sigT {A} (P : A -> Type) := existT { projT1 : A ; projT2 : P projT1 }.
Definition x : sigT (fun x => x).
Proof.
exists big; admit.
Defined.
Goal True.
pose ((fun y => y = y) (projT1 _ x)) as y.
Time cbv beta in y. (* 0s *)
admit.
Defined.
End NonPrim.
Module Prim.
Set Primitive Projections.
Record sigT {A} (P : A -> Type) := existT { projT1 : A ; projT2 : P projT1 }.
Definition x : sigT (fun x => x).
Proof.
exists big; admit.
Defined.
Goal True.
pose ((fun y => y = y) (projT1 _ x)) as y.
Timeout 1 cbv beta in y. (* takes around 2s. Grows with the value passed to [exp] above *)
admit.
Defined.
End Prim.
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