blob: 9cc0d361eafdc755ce41f18a5b3731b20c2e6af9 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
|
(*I'm not sure which behavior is better. But if the change is intentional, it should be documented (I don't think it is), and it'd be nice if there were a flag for this, or if -compat 8.4 restored the old behavior.*)
Require Import Coq.Setoids.Setoid Coq.Classes.Morphisms.
Definition f (v : option nat) := match v with
| Some k => Some k
| None => None
end.
Axioms F G : (option nat -> option nat) -> Prop.
Axiom FG : forall f, f None = None -> F f = G f.
Axiom admit : forall {T}, T.
Existing Instance eq_Reflexive.
Global Instance foo (A := nat)
: Proper ((pointwise_relation _ eq)
==> eq ==> forall_relation (fun _ => Basics.flip Basics.impl))
(@option_rect A (fun _ => Prop)) | 0.
exact admit.
Qed.
Global Instance bar (A := nat)
: Proper ((pointwise_relation _ eq)
==> eq ==> eq ==> Basics.flip Basics.impl)
(@option_rect A (fun _ => Prop)) | 0.
exact admit.
Qed.
Goal forall k, option_rect (fun _ => Prop) (fun v : nat => v = v /\ F f) True k.
Proof.
intro.
pose proof (_ : (Proper (_ ==> eq ==> _) and)).
Fail setoid_rewrite (FG _ _); []. (* In 8.5: Error: Tactic failure: Incorrect number of goals (expected 2 tactics); works in 8.4 *)
|
