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Using tmMkInductive and tmUnquote unpredictably crashes #1114

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MathisBD opened this issue Nov 4, 2024 · 0 comments
Open

Using tmMkInductive and tmUnquote unpredictably crashes #1114

MathisBD opened this issue Nov 4, 2024 · 0 comments

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@MathisBD
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MathisBD commented Nov 4, 2024

Declaring an inductive (tmMkInductive) and unquoting it (tmUnquote) in the same metacoq command unpredictably fails,
depending on which functions are inlined (see MWE).

Here is a MWE to reproduce the bug (I declare a (trivial) inductive and immediately try to unquote it) :

From MetaCoq.Utils Require Import utils.
From MetaCoq.Template Require Import All.
Import MCMonadNotation.

(* Modify this based on the current file. *)
Definition ind : term := 
  tInd {| inductive_mind := (MPfile ["Bug2"], "Ind") ; inductive_ind := 0 |} [].

(* The simplest inductive you can make. *)
Definition mind_body := {|
  ind_finite := Finite;
  ind_npars := 0;
  ind_params := [];
  ind_bodies := [{|
      ind_name := "Ind";
      ind_indices := [];
      ind_sort := sProp;
      ind_type := tSort sProp;
      ind_kelim := IntoPropSProp;
      ind_ctors :=[];
      ind_projs := [];
      ind_relevance := Relevant
    |}];
  ind_universes := Monomorphic_ctx;
  ind_variance := None
|}.

Definition define_ind : TemplateMonad unit :=
  tmMkInductive' mind_body.

Definition unquote_ind : TemplateMonad unit := 
  tmUnquote ind ;; ret tt.

(* Anomaly : "Inductive Bug2.Ind does not appear in the environment." *)
MetaCoq Run (define_ind ;; unquote_ind).

(* Succeeds. *)
MetaCoq Run define_ind.
MetaCoq Run unquote_ind.

(* Succeeds. *)
MetaCoq Run (tmMkInductive' mind_body ;; unquote_ind).
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