X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=blobdiff_plain;f=helm%2Fsoftware%2Fcomponents%2Fng_kernel%2FnCicReduction.ml;h=1815ceedfcf5c87e9d387068ffbfb039c76763ff;hb=32d3f10c1904d450ce8ea3525230acc6980a5601;hp=0393fbcdd7f5927d06cb44c0903f8d91f352ec3d;hpb=7bc72d8afaebb1d2070a26b07f9bf4242b648e2c;p=helm.git

diff --git a/helm/software/components/ng_kernel/nCicReduction.ml b/helm/software/components/ng_kernel/nCicReduction.ml
index 0393fbcdd..1815ceedf 100644
--- a/helm/software/components/ng_kernel/nCicReduction.ml
+++ b/helm/software/components/ng_kernel/nCicReduction.ml
@@ -15,6 +15,8 @@ module C = NCic
 module Ref = NReference
 module E = NCicEnvironment
 
+exception AssertFailure of string Lazy.t;;
+
 module type Strategy = sig
   type stack_term
   type env_term
@@ -400,8 +402,18 @@ let from_stack = RS.from_stack
 let unwind = R.unwind
 
 let _ = 
-  NCicUtils.set_head_beta_reduce (fun ~upto t -> head_beta_reduce ~upto t)
+  NCicUtils.set_head_beta_reduce (fun ~upto t -> head_beta_reduce ~upto t);
+  NCicPp.set_head_beta_reduce (fun ~upto t -> head_beta_reduce ~upto t);
 ;;
 
+(* if n < 0, then splits all prods from an arity, returning a sort *)
+let rec split_prods ~subst context n te =
+  match (n, R.whd ~subst context te) with
+   | (0, _) -> context,te
+   | (n, C.Sort _) when n <= 0 -> context,te
+   | (n, C.Prod (name,so,ta)) ->
+       split_prods ~subst ((name,(C.Decl so))::context) (n - 1) ta
+   | (_, _) -> raise (AssertFailure (lazy "split_prods"))
+;;
 
 (* vim:set foldmethod=marker: *)