From 08da05299d32886bb516124fa497347b40249006 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Tue, 28 Nov 2017 19:49:02 +0100
Subject: In injection/inversion, consider all template-polymorphic types as
 injectable.

In particular singleton inductive types are considered injectable,
even in the absence of the option "Set Keep Proof Equalities".

This fixes #3125 (and #4560, #6273).
---
 tactics/equality.ml | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

(limited to 'tactics')

diff --git a/tactics/equality.ml b/tactics/equality.ml
index c36ad980ef..0d6263246e 100644
--- a/tactics/equality.ml
+++ b/tactics/equality.ml
@@ -739,7 +739,7 @@ let keep_proof_equalities = function
 let find_positions env sigma ~keep_proofs ~no_discr t1 t2 =
   let project env sorts posn t1 t2 =
     let ty1 = get_type_of env sigma t1 in
-    let s = get_sort_family_of env sigma ty1 in
+    let s = get_sort_family_of ~truncation_style:true env sigma ty1 in
     if Sorts.List.mem s sorts
     then [(List.rev posn,t1,t2)] else []
   in
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