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Coercion hook #545

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Coercion hook #545

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13 changes: 11 additions & 2 deletions apps/coercion/src/coq_elpi_coercion_hook.mlg
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,13 @@ open Coq_elpi_vernacular
let elpi_coercion_hook program env sigma ~flags v ~inferred ~expected =
let loc = API.Ast.Loc.initial "(unknown)" in
let atts = [] in
let (env, sigma, expected, retype) =
match expected with
| Coercion.Type t -> (env, sigma, t, false)
| Coercion.Product -> begin let (sigma, (source, _)) = Evarutil.new_type_evar env sigma Evd.univ_flexible in
let (sigma, (target, _)) = let env = EConstr.push_rel (Context.Rel.Declaration.LocalAssum (Context.annotR (Names.Name (Namegen.default_dependent_ident)) , source)) env in Evarutil.new_type_evar env sigma Evd.univ_flexible in
(env, sigma, EConstr.mkProd (Context.annotR (Names.Name (Namegen.default_type_ident)), source, target), true) end
| Coercion.Sort -> let (sigma, t) = Evarutil.new_Type sigma in (env, sigma, t, true) in
let sigma, goal = Evarutil.new_evar env sigma expected in
let goal_evar, _ = EConstr.destEvar sigma goal in
let query ~depth state =
Expand All @@ -28,7 +35,9 @@ let elpi_coercion_hook program env sigma ~flags v ~inferred ~expected =
| API.Execute.Success solution ->
let gls = Evar.Set.singleton goal_evar in
let sigma, _, _ = Coq_elpi_HOAS.solution2evd sigma solution gls in
if Evd.is_defined sigma goal_evar then Some (sigma, goal) else None
if Evd.is_defined sigma goal_evar
then let t = if retype then Retyping.get_type_of env sigma goal else expected in Some (sigma, goal, t)
else None
| API.Execute.NoMoreSteps
| API.Execute.Failure -> None
| exception (Coq_elpi_utils.LtacFail (level, msg)) -> None
Expand Down Expand Up @@ -57,4 +66,4 @@ VERNAC COMMAND EXTEND ElpiCoercion CLASSIFIED AS SIDEFF
let () = ignore_unknown_attributes atts in
add_coercion_hook (snd p) }

END
END
17 changes: 17 additions & 0 deletions apps/coercion/tests/test_coercion.v
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Expand Up @@ -32,3 +32,20 @@ Check natmul R n : ringType_sort R.
Check n : ringType_sort R.

End TestNatMul.

Elpi Accumulate coercion.db lp:{{

coercion _ V T E {{ Nat.mul lp:V }} :-
coq.unify-eq T {{ nat }} ok,
coq.unify-eq E {{ nat -> nat }} ok.

coercion _ V T E {{ { m : nat | m < lp:V } }} :-
coq.unify-eq T {{ nat }} ok,
coq.unify-eq E {{ Type }} ok.

}}.
Elpi Typecheck coercion.

Check 3 2.
Check forall (x : 3), proj1_sig x < 3.

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