added comment

diff --git a/helm/ocaml/tactics/primitiveTactics.ml b/helm/ocaml/tactics/primitiveTactics.ml
index 5b3e47fba02540d96cacb67138b0eb9a78d955df..c1823d1c9d3af3a12cc4a4d701ea9590cea56b4a 100644 (file)
--- a/helm/ocaml/tactics/primitiveTactics.ml
+++ b/helm/ocaml/tactics/primitiveTactics.ml
@@ -201,6 +201,12 @@ let new_metasenv_for_apply newmeta proof context ty =
          in
          let s' = CicReduction.normalize ~delta:false context s in
           res,(newmeta,context,s')::newmetasenv,newargument::arguments,lastmeta
+          (** NORMALIZE RATIONALE 
+           * we normalize the target only NOW since we may be in this case:
+           * A1 -> A2 -> T where T = (\lambda x.A3 -> P) k  
+           * and we want a mesasenv with ?1:A1 and ?2:A2 and not
+           * ?1, ?2, ?3 (that is the one we whould get if we start from the
+           * beta-normalized A1 -> A2 -> A3 -> P **)
     | t -> (CicReduction.normalize ~delta:false context t),[],[],newmeta
   in
    (* WARNING: here we are using the invariant that above the most *)