feat(cdsat): decide new variables

src/cdsat/core.ml

@@ -187,8 +187,21 @@ let pop_levels (self : t) n : unit =
 
 let[@inline] get_term_to_var self = self.term_to_var
 
-let[@inline] term_to_var self t : TVar.t =
+let term_to_var self t : TVar.t =
-  Term_to_var.convert self.term_to_var t
+  (* TODO: simplify [t] *)
+  let v = Term_to_var.convert self.term_to_var t in
+
+  (* add new variables to vars_to_decide *)
+  while
+    match TVar.pop_new_var self.vst with
+    | None -> false
+    | Some v ->
+      Vars_to_decide.add self.vars_to_decide v;
+      true
+  do
+    ()
+  done;
+  v
 
 let add_term_to_var_hook self h = Term_to_var.add_hook self.term_to_var h
 

src/cdsat/solver.ml

@@ -41,13 +41,6 @@ let[@inline] vst self = self.vst
 
 let add_ty (_self : t) ~ty:_ : unit = ()
 
-(* TODO:
-   when asserting [t], we convert it into [v].
-   At that point we need to add [v] and its sub-variables (recursively)
-   to the [Core.t], so it can itself add them to [Vars_to_decide.t].
-
-   Sub-variables of asserted terms are what needs to be decided. *)
-
 let assert_term_ (self : t) (t : Term.t) pr : unit =
   Log.debugf 50 (fun k -> k "(@[cdsat.core.assert@ %a@])" Term.pp t);
   let sign, t = Term.abs self.tst t in