Hi,

It is not yet clear to me how I should declare the arguments of a `Coq`

tactic which is based upon an `Elpi`

tactic.

Look at the following code (I leave the tactic `mytac`

opaque, I doubt its body matters here).

```
Elpi Tactic mytac.
(* snip *)
solve (goal _ _ _ _ [trm M, int N] as G) GL :
(* snip *)
Elpi Typecheck.
Tactic Notation "mytac" constr(l) integer(n) := elpi mytac (l) ltac_int(n).
(* this also fails when I remove ltac_int *)
Goal forall (n : nat), n = 3 -> 2 +2 = 5.
intros n.
elpi mytac
(match 2 with
| 0 => true
| S k => false
end) 0.
Fail mytac
(match 2 with
| 0 => true
| S k => false
end) 0.
```

The last instruction gives:

```
The command has indeed failed with message:
The elpi tactic mytac failed without giving a specific error message. Please
report this inconvenience to the authors of the program.
```

In this case, how should I declare the `Coq`

tactic `mytac`

?

Last updated: Feb 05 2023 at 13:02 UTC