diff --git a/examples/acceptance_tests/114/aiken.toml b/examples/acceptance_tests/114/aiken.toml
new file mode 100644
index 00000000..58351e3c
--- /dev/null
+++ b/examples/acceptance_tests/114/aiken.toml
@@ -0,0 +1,9 @@
+name = "aiken-lang/acceptance_test_114"
+version = "0.0.0"
+license = "Apache-2.0"
+description = "Aiken contracts for project 'aiken-lang/114'"
+
+[repository]
+user = "aiken-lang"
+project = "114"
+platform = "github"
diff --git a/examples/acceptance_tests/114/lib/foo.ak b/examples/acceptance_tests/114/lib/foo.ak
new file mode 100644
index 00000000..484205e8
--- /dev/null
+++ b/examples/acceptance_tests/114/lib/foo.ak
@@ -0,0 +1,52 @@
+use aiken/builtin
+
+pub type Decoder<a> =
+  fn(ByteArray) -> Option<(a, ByteArray)>
+
+pub fn data() -> Decoder<Data> {
+  fn(bytes) {
+    when int()(bytes) is {
+      Some((n, "")) -> Some((builtin.i_data(n), ""))
+      _ ->
+        when list(data())(bytes) is {
+          Some((xs, "")) -> Some((builtin.list_data(xs), ""))
+          _ -> None
+        }
+    }
+  }
+}
+
+/// Dummy implementation: always decode two elements
+pub fn list(decode_one: Decoder<a>) -> Decoder<List<a>> {
+  fn(bytes) {
+    when decode_one(bytes) is {
+      Some((a0, bytes)) ->
+        when decode_one(bytes) is {
+          Some((a1, bytes)) -> Some(([a0, a1], bytes))
+          None -> None
+        }
+      None -> None
+    }
+  }
+}
+
+/// Dummy implementation: consume the next byte and yield 42.
+pub fn int() -> Decoder<Int> {
+  fn(bytes) {
+    Some(
+      (
+        42,
+        builtin.slice_bytearray(
+          1,
+          builtin.length_of_bytearray(bytes) - 1,
+          bytes,
+        ),
+      ),
+    )
+  }
+}
+
+test decode_data() {
+  let d: Data = [42, 42]
+  data()(#"0000") == Some((d, ""))
+}