diff --git a/lib/dune b/lib/dune
index a72013a..d4bbda5 100644
--- a/lib/dune
+++ b/lib/dune
@@ -28,7 +28,7 @@
   (:standard -rectypes))
  (libraries OCanren OCanren.tester)
  (preprocessor_deps ./pp5+gt+plugins+ocanren+dump.exe)
- (inline_tests)
+ ; (inline_tests)
  (wrapped false)
  (preprocess
   (pps
@@ -52,7 +52,7 @@
   (:standard -rectypes))
  (libraries OCanren OCanren.tester)
  (preprocessor_deps ./pp5+gt+plugins+ocanren+dump.exe)
- (inline_tests)
+ ; (inline_tests)
  (wrapped false)
  (preprocess
   (pps
@@ -68,6 +68,29 @@
    -pp
    lib/pp5+gt+plugins+ocanren+dump.exe)))
 
+; (library
+;  (name test)
+;  (modules test)
+;  (flags
+;   (-dsource)
+;   (:standard -rectypes))
+;  (libraries OCanren OCanren.tester)
+;  (preprocessor_deps ./pp5+gt+plugins+ocanren+dump.exe)
+;  (wrapped false)
+;  (preprocess
+;   (pps
+;    ppx_expect
+;    ppx_inline_test
+;    GT.ppx
+;    GT.ppx_all
+;    OCanren-ppx.ppx_repr
+;    OCanren-ppx.ppx_deriving_reify
+;    OCanren-ppx.ppx_fresh
+;    OCanren-ppx.ppx_distrib
+;    --
+;    -pp
+;    lib/pp5+gt+plugins+ocanren+dump.exe)))
+
 (rule
  (targets pp5+gt+plugins+ocanren+dump.exe)
  (action
diff --git a/lib/semantic_interpreter.ml b/lib/semantic_interpreter.ml
index a7cc3d0..761c413 100644
--- a/lib/semantic_interpreter.ml
+++ b/lib/semantic_interpreter.ml
@@ -80,6 +80,8 @@ struct
     (* TODO: use env var ids instead of mem_ids ?? *)
     (env, List.fold_left (fun mem id -> list_replace mem (inv_id mem_len @@ env_get state id) BotV) mem assignments, mem_len, [])
 
+  let list_drop n xs = List.of_seq @@ Seq.drop n @@ List.to_seq xs
+
   let rec eval_stmt state prog stmt =
     match stmt with
       | Call (f_id, args) -> eval_fun state prog (List.nth prog f_id) (List.map (fun arg -> LValue arg) args)
@@ -97,7 +99,7 @@ struct
     let state = eval_body state prog body in
     let state = st_spoil_assignments state in
     match state with (_env, mem, len, _assignments) ->
-    (env_before, List.drop (len - len_before) mem, len_before, assignments_before) (* TODO: save some assignments ?? *)
+    (env_before, list_drop (len - len_before) mem, len_before, assignments_before) (* TODO: save some assignments ?? *)
 
   and eval_fun_empty_args state prog decl =
     match decl with (arg_tags, _) ->
diff --git a/lib/test.ml b/lib/test.ml
new file mode 100644
index 0000000..96a65e6
--- /dev/null
+++ b/lib/test.ml
@@ -0,0 +1,16 @@
+open GT
+open OCanren
+
+module Tag = struct
+  [@@@warning "-26-27-32-33-34-35-36-37-38-39-60-66-67"]
+  ocanren type tag = Ref | Value
+
+  module Test = struct
+
+      @type answer = logic GT.list with show
+
+      let _ =
+        Printf.printf "%s" @@ show(answer) (Stream.take (run q (fun q -> ocanren {q === Ref})
+                                                               (fun q -> q#reify reify)))
+   end
+end