Fixing computation of non-recursively uniform arguments in the

presence of let-ins. This fixes #3491.

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/indtypes.ml b/kernel/indtypes.ml
index 49bf3281fe..6b909824ba 100644
--- a/kernel/indtypes.ml
+++ b/kernel/indtypes.ml
@@ -485,6 +485,7 @@ let check_positivity_one (env,_,ntypes,_ as ienv) hyps (_,i as ind) nargs lcname
 	          check_pos (ienv_push_var ienv (na, b, mk_norec)) nmr d)
 	| Rel k ->
             (try let (ra,rarg) = List.nth ra_env (k-1) in
+            let largs = List.map (whd_betadeltaiota env) largs in
 	    let nmr1 =
 	      (match ra with
                   Mrec _ -> compute_rec_par ienv hyps nmr largs