From c32efcb1b44108f321a1cd2e7d42cd8cabe3170c Mon Sep 17 00:00:00 2001
From: herbelin
Date: Fri, 18 May 2007 17:14:23 +0000
Subject: Wish #1582 (3eme)

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@9838 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 tactics/refine.ml           | 16 ++++++++++------
 test-suite/success/refine.v | 18 ++++++++++++++++++
 2 files changed, 28 insertions(+), 6 deletions(-)

diff --git a/tactics/refine.ml b/tactics/refine.ml
index bfab02064e..a9fdfacb89 100644
--- a/tactics/refine.ml
+++ b/tactics/refine.ml
@@ -327,12 +327,16 @@ let rec tcc_aux subst (TH (c,mm,sgp) as _th) gl =
     | LetIn (Name id,c1,t1,c2), _ ->
 	tclTHENS
           (assert_tac true (Name id) t1) 
-	  [(match sgp with 
-	     | [None] -> tclIDTAC
-	     | [Some th] -> onLastHyp (fun id -> tcc_aux (mkVar id::subst) th)
-	     | _ -> assert false);
-           exact_check (subst1 (mkVar id) c2)]
-	  gl
+	  [(match List.hd sgp with 
+	     | None -> tclIDTAC
+	     | Some th -> onLastHyp (fun id -> tcc_aux (mkVar id::subst) th));
+           (match List.tl sgp with 
+	     | [] -> refine (subst1 (mkVar id) c2)  (* a complete proof *)
+	     | [None] -> tclIDTAC                   (* a meta *)
+	     | [Some th] ->                         (* a partial proof *)
+                 onLastHyp (fun id -> tcc_aux (mkVar id::subst) th)
+             | _ -> assert false)]
+          gl
 
     (* fix => tactique Fix *)
     | Fix ((ni,_),(fi,ai,_)) , _ ->
diff --git a/test-suite/success/refine.v b/test-suite/success/refine.v
index 793cddb826..4b636618ad 100644
--- a/test-suite/success/refine.v
+++ b/test-suite/success/refine.v
@@ -99,3 +99,21 @@ Goal
 intros.
 refine (@proj1 _ _ (H 0 _ _)).
 Abort.
+
+(* Use to fail because let-in with metas in the body where rejected
+   because a priori considered as dependent *)
+
+Require Import Peano_dec.
+
+Definition fact_F : 
+  forall (n:nat),
+  (forall m, m<n -> nat) ->
+  nat.
+refine 
+  (fun n fact_rec =>
+     if eq_nat_dec n 0 then 
+        1
+     else
+	let fn := fact_rec (n-1) _ in
+        n * fn).
+Abort.
-- 
cgit v1.2.3