the type of the match was obtained reducing the outtype

applied to right + matched with whd ~delta:true that
is not what you want. replaced with head_beta_reduce.

diff --git a/helm/software/components/cic_unification/cicRefine.ml b/helm/software/components/cic_unification/cicRefine.ml
index 04d9d7224d6430a274e300d94bc59bde2b295b7f..a1a7bdea8ebe9f5861bb602d61fd13cf7e390abe 100644 (file)
--- a/helm/software/components/cic_unification/cicRefine.ml
+++ b/helm/software/components/cic_unification/cicRefine.ml
@@ -801,7 +801,8 @@ and type_of_aux' ?(clean_dummy_dependent_types=true) ?(localization_tbl = Cic.Ci
                         in
                           C.Appl (outtype'::args)
                       in
-                        CicReduction.whd ~subst context appl
+                        CicReduction.head_beta_reduce ~delta:false 
+                          ~upto:(List.length args) appl 
                     in
                      try
                       fo_unif_subst subst context metasenv instance instance'