From 4341f37cf3c51ed82c23f05846c8e6e8823d3cd6 Mon Sep 17 00:00:00 2001
From: Matthieu Sozeau
Date: Thu, 10 Mar 2016 19:02:16 +0100
Subject: Primitive projections: protect kernel from erroneous definitions.

E.g., Inductive foo := mkFoo { bla : foo } allowed to define recursive
records with eta for which conversion is incomplete.

- Eta-conversion only applies to BiFinite inductives
- Finiteness information is now checked by the kernel (the constructor types
  must be strictly non recursive for BiFinite declarations).
---
 kernel/closure.ml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'kernel/closure.ml')

diff --git a/kernel/closure.ml b/kernel/closure.ml
index 2ba80d8362..93e63d0fb5 100644
--- a/kernel/closure.ml
+++ b/kernel/closure.ml
@@ -784,7 +784,7 @@ let eta_expand_ind_stack env ind m s (f, s') =
   let mib = lookup_mind (fst ind) env in
     match mib.Declarations.mind_record with
     | Some (Some (_,projs,pbs)) when
-	mib.Declarations.mind_finite <> Decl_kinds.CoFinite -> 
+	mib.Declarations.mind_finite == Decl_kinds.BiFinite -> 
 	(* (Construct, pars1 .. parsm :: arg1...argn :: []) ~= (f, s') ->
 	   arg1..argn ~= (proj1 t...projn t) where t = zip (f,s') *)
       let pars = mib.Declarations.mind_nparams in
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