From 479d4cd6e9934a47debf6201fccf7ebb1aea1b09 Mon Sep 17 00:00:00 2001
From: Hugo Herbelin
Date: Sat, 7 Nov 2015 22:21:10 +0100
Subject: Implementing assert and cut with LetIn rather than using a
 beta-redex. Hopefully, it will provide with nicer proof terms, in combination
 with the commit printing the type of LetIn when the defined term is a proof.

---
 tactics/tactics.ml | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

(limited to 'tactics')

diff --git a/tactics/tactics.ml b/tactics/tactics.ml
index 5f7fcce572..936c5988f6 100644
--- a/tactics/tactics.ml
+++ b/tactics/tactics.ml
@@ -1062,8 +1062,8 @@ let cut c =
       Proofview.Refine.refine ~unsafe:true { run = begin fun h ->
         let Sigma (f, h, p) = Evarutil.new_evar ~principal:true env h (mkArrow c (Vars.lift 1 concl)) in
         let Sigma (x, h, q) = Evarutil.new_evar env h c in
-        let f = mkLambda (Name id, c, mkApp (Vars.lift 1 f, [|mkRel 1|])) in
-        Sigma (mkApp (f, [|x|]), h, p +> q)
+        let f = mkLetIn (Name id, x, c, mkApp (Vars.lift 1 f, [|mkRel 1|])) in
+        Sigma (f, h, p +> q)
       end }
     else
       Tacticals.New.tclZEROMSG (str "Not a proposition or a type.")
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