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[derive] Add some missing universe constraints #754

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Jan 24, 2025
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[derive] Add some missing universe constraints #754

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2 changes: 2 additions & 0 deletions apps/derive/elpi/param2.elpi
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Expand Up @@ -159,6 +159,8 @@ dispatch (const GR as C) Suffix Clauses :- do! [

param Ty _ TyR,
coq.mk-app TyR [Term, Term] TyRTermTerm,
% coq.typecheck is needed to add universe constraints
std.assert-ok! (coq.typecheck TyRTermTerm _) "param2: illtyped param type",
param X _ XR,
% apparently calling the type checker with the expected type is weaker in this case
std.assert-ok! (coq.typecheck XR XRTy) "param2: illtyped constant",
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7 changes: 7 additions & 0 deletions apps/derive/tests/test_param2.v
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Expand Up @@ -85,3 +85,10 @@ Elpi derive.param2 bla.
Fixpoint silly (n : nat) := n.
Elpi derive.param2 silly.

Definition size_of (A : Type) := A -> nat.

Definition size_seq (A : Type) : size_of (list A) := fun _ => 0.

Elpi derive.param2 size_of.

Elpi derive.param2 size_seq. (* Fixed by https://github.com/LPCIC/coq-elpi/pull/754 *)
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