From f2da732ffd5db2b93a2c8120c668f8b2f6068d3b Mon Sep 17 00:00:00 2001
From: filliatr
Date: Tue, 7 Dec 1999 14:56:36 +0000
Subject: debuggage inductifs (suite) / compilation Dhyp et Auto (mais pas
 linkes

git-svn-id: svn+ssh://scm.gforge.inria.fr/svn/coq/trunk@220 85f007b7-540e-0410-9357-904b9bb8a0f7
---
 kernel/typeops.ml | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

(limited to 'kernel/typeops.ml')

diff --git a/kernel/typeops.ml b/kernel/typeops.ml
index 255e8d7aa5..46dd750781 100644
--- a/kernel/typeops.ml
+++ b/kernel/typeops.ml
@@ -954,3 +954,19 @@ let control_only_guard env sigma =
     | DLAMV(_,v)    -> Array.iter control_rec v
   in 
   control_rec 
+
+(* [keep_hyps sign ids] keeps the part of the signature [sign] which 
+   contains the variables of the set [ids], and recursively the variables 
+   contained in the types of the needed variables. *)
+
+let keep_hyps sign needed =
+  rev_sign
+    (fst (it_sign 
+	    (fun ((hyps,globs) as sofar) id a ->
+               if Idset.mem id globs then
+                 (add_sign (id,a) hyps, 
+		  Idset.union (global_vars_set a.body) globs)
+               else 
+		 sofar) 
+	    (nil_sign,needed) sign))
+    
-- 
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