X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Ftactics%2Funiverse.ml;h=99041ed1ba33a8e1e526d1e96656f7c13a612046;hb=eeed0d603ddadba6b5ee5041e87794051b9283dd;hp=1de14927049ad475414aa95d05f2b55ab184b9c2;hpb=842e504b575199aab7bca96c01b3c5d8ef28f712;p=helm.git

diff --git a/helm/software/components/tactics/universe.ml b/helm/software/components/tactics/universe.ml
index 1de149270..99041ed1b 100644
--- a/helm/software/components/tactics/universe.ml
+++ b/helm/software/components/tactics/universe.ml
@@ -41,42 +41,59 @@ let get_candidates univ ty =
 let rec unfold context = function
   | Cic.Prod(name,s,t) -> 
       let t' = unfold ((Some (name,Cic.Decl s))::context) t in
-	Cic.Prod(name,s,t')	
+        Cic.Prod(name,s,t')        
   | t -> ProofEngineReduction.unfold context t
 
-let rec collapse_head_metas = function 
-  | Cic.Appl(a::l) -> 
-      let a' = collapse_head_metas a in
-      (match a' with
-	| Cic.Meta(n,m) -> Cic.Meta(n,m)
-	| t -> 	
-	    let l' = List.map collapse_head_metas l in
-	       Cic.Appl(t::l'))
-  | t -> t
+let rec collapse_head_metas t = 
+  match t with
+    | Cic.Appl([]) -> assert false
+    | Cic.Appl(a::l) -> 
+	let a' = collapse_head_metas a in
+	  (match a' with
+	     | Cic.Meta(n,m) -> Cic.Meta(n,m)
+	     | t -> 	
+		 let l' = List.map collapse_head_metas l in
+		   Cic.Appl(t::l'))
+    | Cic.Rel _ 
+    | Cic.Var _	 
+    | Cic.Meta _ 
+    | Cic.Sort _ 
+    | Cic.Implicit _
+    | Cic.Const _ 
+    | Cic.MutInd _
+    | Cic.MutConstruct _ -> t
+    | Cic.LetIn _
+    | Cic.Lambda _
+    | Cic.Prod _
+    | Cic.Cast _
+    | Cic.MutCase _
+    | Cic.Fix _
+    | Cic.CoFix _ -> Cic.Meta(-1,[])
 ;;
 
 let rec dummies_of_coercions = 
   function
     | Cic.Appl (c::l) when CoercDb.is_a_coercion' c ->
-	Cic.Meta (-1,[])
+        Cic.Meta (-1,[])
     | Cic.Appl l -> 
-	let l' = List.map dummies_of_coercions l in Cic.Appl l'
+        let l' = List.map dummies_of_coercions l in Cic.Appl l'
     | Cic.Lambda(n,s,t) ->
-	let s' = dummies_of_coercions s in
-	let t' = dummies_of_coercions t in
-	  Cic.Lambda (n,s',t')
+        let s' = dummies_of_coercions s in
+        let t' = dummies_of_coercions t in
+          Cic.Lambda (n,s',t')
     | Cic.Prod(n,s,t) ->
-	let s' = dummies_of_coercions s in
-	let t' = dummies_of_coercions t in
-	  Cic.Prod (n,s',t')	
+        let s' = dummies_of_coercions s in
+        let t' = dummies_of_coercions t in
+          Cic.Prod (n,s',t')        
     | Cic.LetIn(n,s,t) ->
-	let s' = dummies_of_coercions s in
-	let t' = dummies_of_coercions t in
-	  Cic.LetIn (n,s',t')	
-    | Cic.MutCase _ -> prerr_endline "mutcase";Cic.Meta (-1,[])
+        let s' = dummies_of_coercions s in
+        let t' = dummies_of_coercions t in
+          Cic.LetIn (n,s',t')        
+    | Cic.MutCase _ -> Cic.Meta (-1,[])
     | t -> t
 ;;
 
+
 let rec head remove_coercions t = 
   let clean_up t =
     if remove_coercions then dummies_of_coercions t
@@ -102,6 +119,8 @@ let keys context ty =
     [head true ty; head true (unfold context ty)]
   with ProofEngineTypes.Fail _ -> [head true ty]
 
+let key term = head false term
+
 let index_term_and_unfolded_term univ context t ty =
   let key = head true ty in
   let univ = index univ key t in