diff --git a/examples/acceptance_tests/007/aiken.toml b/examples/acceptance_tests/007/aiken.toml
new file mode 100644
index 00000000..a3ee5646
--- /dev/null
+++ b/examples/acceptance_tests/007/aiken.toml
@@ -0,0 +1,2 @@
+name = "acceptance_test_007"
+version = "0.0.0"
diff --git a/examples/acceptance_tests/007/lib/test.ak b/examples/acceptance_tests/007/lib/test.ak
new file mode 100644
index 00000000..82fc7f83
--- /dev/null
+++ b/examples/acceptance_tests/007/lib/test.ak
@@ -0,0 +1,9 @@
+pub fn unzip(xs: List<(a, b)>) -> (List<a>, List<b>) {
+  when xs is {
+    [] -> ([], [])
+    [(a, b), ..rest] -> {
+      let (a_tail, b_tail) = unzip(rest)
+      ([a, ..a_tail], [b, ..b_tail])
+    }
+  }
+}