fixed list.nth and added some paretheses

diff --git a/helm/software/components/ng_kernel/nCicPp.ml b/helm/software/components/ng_kernel/nCicPp.ml
index 27c7fc97ef837fc06275a3b4060d6e9eeb43fb5e..087e58c98b6955f40829488bffb1753571a153d8 100644 (file)
--- a/helm/software/components/ng_kernel/nCicPp.ml
+++ b/helm/software/components/ng_kernel/nCicPp.ml
@@ -14,16 +14,17 @@ module R = NReference
 let trivial_pp_term ~context ~subst ~metasenv = 
   let rec aux ctx = function
    | C.Rel m ->
-       (try List.nth ctx m
-       with Not_found -> " -" ^ string_of_int (m - List.length context))
+       (try List.nth ctx (m-1)
+       with Failure _ -> " -" ^ string_of_int (m - List.length context))
    | C.Const r -> R.string_of_reference r
-   | C.Prod (name,s,t) -> " \Pi "^name^":"^aux ctx s^"."^aux (name::ctx) t
-   | C.Lambda (name,s,t) -> " \lambda "^name^":"^aux ctx s^"."^aux (name::ctx) t
+   | C.Prod (name,s,t) -> "(\Pi "^name^":"^aux ctx s^"."^aux (name::ctx) t^")"
+   | C.Lambda (name,s,t) -> 
+      "(\lambda "^name^":"^aux ctx s^"."^aux (name::ctx) t^")"
    | C.LetIn (name,ty,t,b) -> 
-        " let "^name^":"^aux ctx ty^":="^aux ctx t^" in "^aux (name::ctx) b
+      "(let "^name^":"^aux ctx ty^":="^aux ctx t^" in "^aux (name::ctx) b^")"
    | C.Match (_,oty,t,pl) ->
-        " match " ^ aux ctx t ^ " return " ^ aux ctx oty ^ "[" ^
-        String.concat "|" (List.map (aux ctx) pl) ^ "]"
+      " match " ^ aux ctx t ^ " return " ^ aux ctx oty ^ "[" ^
+      String.concat "|" (List.map (aux ctx) pl) ^ "]"
    | C.Appl l -> "("^String.concat " " (List.map (aux ctx) l) ^")"
    | C.Implicit _ -> "?"
    | C.Meta (n,_) -> "?"^string_of_int n