From cac93f3147ddf259e90172e9f7e993ca324944e0 Mon Sep 17 00:00:00 2001
From: Son Ho
Date: Mon, 3 Jan 2022 16:38:40 +0100
Subject: Implement rty_regions

---
 src/Interpreter.ml | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/src/Interpreter.ml b/src/Interpreter.ml
index 68b92361..a5d414aa 100644
--- a/src/Interpreter.ml
+++ b/src/Interpreter.ml
@@ -648,9 +648,20 @@ let region_in_set (r : T.RegionId.id T.region) (rset : T.RegionId.set_t) : bool
 (** Return the set of regions in an rty *)
 let rty_regions (ty : T.rty) : T.RegionId.set_t =
   let s = ref T.RegionId.Set.empty in
-  let add_region r = s := T.RegionId.Set.add r !s in
+  let add_region (r : T.RegionId.id T.region) =
+    match r with T.Static -> () | T.Var rid -> s := T.RegionId.Set.add rid !s
+  in
+  let obj =
+    object
+      inherit [_] T.iter_ty
 
-  raise Unimplemented
+      method! visit_'r _env r = add_region r
+    end
+  in
+  (* Explore the type *)
+  obj#visit_ty () ty;
+  (* Return the set of accumulated regions *)
+  !s
 
 let rty_regions_intersect (ty : T.rty) (regions : T.RegionId.set_t) : bool =
   let ty_regions = rty_regions ty in
-- 
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