Fixing #4782 (a typing error not captured when dealing with bindings).

Trying to now catch all unification errors, but without a clear view
at whether some errors could be tolerated at the point of checking the
type of the binding.

proofs/clenv.ml

@@ -459,7 +459,7 @@ let clenv_unify_binding_type clenv c t u =
       let evd,c = w_coerce_to_type (cl_env clenv) clenv.evd c t u in
       TypeProcessed, { clenv with evd = evd }, c
     with 
-      | PretypeError (_,_,ActualTypeNotCoercible (_,_,NotClean _)) as e ->
+      | PretypeError (_,_,ActualTypeNotCoercible _) as e ->
 	  raise e
       | e when precatchable_exception e ->
 	  TypeNotProcessed, clenv, c

test-suite/bugs/closed/4782.v

@@ -0,0 +1,8 @@
+(* About typing of with bindings *)
+
+Record r : Type := mk_r { type : Type; cond : type -> Prop }.
+
+Inductive p : Prop := consp : forall (e : r) (x : type e), cond e x -> p.
+
+Goal p.
+Fail apply consp with (fun _ : bool => mk_r unit (fun x => True)) nil.