diff --git a/tests/list/.gitignore b/tests/list/.gitignore
new file mode 100644
index 0000000..dd4ff93
--- /dev/null
+++ b/tests/list/.gitignore
@@ -0,0 +1,2 @@
+/list_test.ml
+/list_test_unnesting.ml
diff --git a/tests/list/dune b/tests/list/dune
index 428c272..8658c89 100644
--- a/tests/list/dune
+++ b/tests/list/dune
@@ -10,12 +10,29 @@
   (:peano %{project_root}/std/.Peano.objs/byte/peano.cmi)
   (:exec %{project_root}/src/noCanren.exe)
   (:input list_test.ml2mk.ml))
+ (mode
+  (promote (until-clean)))
  (action
   (run
    sh
    -c
    "%{exec} -w -8 %{input} -rectypes -o %{targets} | ocamlformat --enable-outside-detected-project --impl -")))
 
+(rule
+ (targets list_test_unnesting.ml)
+ (deps
+  (:list %{project_root}/std/.List.objs/byte/list.cmi)
+  (:peano %{project_root}/std/.Peano.objs/byte/peano.cmi)
+  (:exec %{project_root}/src/noCanren.exe)
+  (:input unnesting.ml2mk.ml))
+ (mode
+  (promote (until-clean)))
+ (action
+  (run
+   sh
+   -c
+   "%{exec}  -unnesting-mode   -without-activate-tactics -w -8 %{input} -rectypes -o %{targets} ")))
+
 (executable
  (name list_test_run)
  (libraries GT OCanren OCanren.tester Peano List)
@@ -27,5 +44,18 @@
    OCanren-ppx.ppx_distrib
    GT.ppx_all)))
 
+(executable
+ (name list_test_run2)
+ (libraries GT OCanren OCanren.tester Peano List)
+ (modules list_test_run2 list_test_unnesting)
+ (flags
+  (:standard -open OCanren.Std))
+ (preprocess
+  (pps
+   OCanren-ppx.ppx_repr
+   OCanren-ppx.ppx_fresh
+   OCanren-ppx.ppx_distrib
+   GT.ppx_all)))
+
 (cram
- (deps ./list_test_run.exe))
+ (deps ./list_test_run.exe ./list_test_run2.exe))
diff --git a/tests/list/list_test.t b/tests/list/list_test.t
index 4a6a2d2..f7712c3 100644
--- a/tests/list/list_test.t
+++ b/tests/list/list_test.t
@@ -1,3 +1,4 @@
+  $ ./list_test_run2.exe
   $ ./list_test_run.exe
   lenght, all answers {
   q=5;
diff --git a/tests/list/list_test_run2.ml b/tests/list/list_test_run2.ml
new file mode 100644
index 0000000..8fe7958
--- /dev/null
+++ b/tests/list/list_test_run2.ml
@@ -0,0 +1,15 @@
+open OCanren
+open OCanren.Std
+open Tester
+open List_test_unnesting
+
+let () =
+  let injected : int ilogic Std.List.injected = OCanren.Std.list ( !! ) [ 1 ] in
+  let _ =
+    OCanren.(run q)
+      (list_map (fun x q17 -> x === q17) injected)
+      (fun rr -> rr#reify (Std.List.reify OCanren.reify))
+    |> OCanren.Stream.hd
+  in
+  ()
+;;
diff --git a/tests/list/unnesting.ml2mk.ml b/tests/list/unnesting.ml2mk.ml
new file mode 100644
index 0000000..8cd1134
--- /dev/null
+++ b/tests/list/unnesting.ml2mk.ml
@@ -0,0 +1,11 @@
+open List
+open Peano
+
+let list_map f xs =
+  let rec helper xs =
+    match xs with
+    | [] -> []
+    | x :: xs -> f x :: helper xs
+  in
+  helper xs
+;;