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+version = "0.5.17"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "a3b801d0e0a6726477cc207f60162da452f3a95adb368399bef20a946e06f65c"
+dependencies = [
+ "memchr",
+]
diff --git a/Cargo.toml b/Cargo.toml
new file mode 100644
index 0000000..fc8cc50
--- /dev/null
+++ b/Cargo.toml
@@ -0,0 +1,6 @@
+[workspace]
+members = ["unit_struct"]
+resolver = "2"
+
+[workspace.dependencies]
+ic-cdk = "0.11"
diff --git a/build.sh b/build.sh
new file mode 100644
index 0000000..b3b4d1d
--- /dev/null
+++ b/build.sh
@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -e
+
+cargo build --target wasm32-unknown-unknown \
+    --release \
+    --package "$1"
+
+# ic-wasm "$example_root/target/wasm32-unknown-unknown/release/$package.wasm" \
+#     -o "$example_root/target/wasm32-unknown-unknown/release/$package.wasm" \
+#     metadata candid:service -v public -f $did_file
+
+# ic-wasm "$example_root/target/wasm32-unknown-unknown/release/$package.wasm" \
+#     -o "$example_root/target/wasm32-unknown-unknown/release/$package-opt.wasm" \
+#     shrink
diff --git a/counter.did b/counter.did
new file mode 100644
index 0000000..3bc76db
--- /dev/null
+++ b/counter.did
@@ -0,0 +1,4 @@
+service : {
+    inc : () -> ();
+    read : () -> (nat64) query;
+};
diff --git a/dfx.json b/dfx.json
new file mode 100644
index 0000000..c86e368
--- /dev/null
+++ b/dfx.json
@@ -0,0 +1,21 @@
+{
+    "canisters": {
+        "unit_struct": {
+            "type": "custom",
+            "build": "sh build.sh unit_struct",
+            "candid": "counter.did",
+            "wasm": "target/wasm32-unknown-unknown/release/unit_struct.wasm",
+            "shrink": true,
+            "metadata": [
+                {
+                    "name": "candid:service",
+                    "visibility": "public"
+                },
+                {
+                    "name": "candid:args",
+                    "visibility": "public"
+                }
+            ]
+        }
+    }
+}
\ No newline at end of file
diff --git a/unit_struct/Cargo.toml b/unit_struct/Cargo.toml
new file mode 100644
index 0000000..fab49c0
--- /dev/null
+++ b/unit_struct/Cargo.toml
@@ -0,0 +1,12 @@
+[package]
+name = "unit_struct"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+ic-cdk.workspace = true
+
+[lib]
+crate-type = ["cdylib"]
diff --git a/unit_struct/src/lib.rs b/unit_struct/src/lib.rs
new file mode 100644
index 0000000..2bc95c9
--- /dev/null
+++ b/unit_struct/src/lib.rs
@@ -0,0 +1,44 @@
+// ic_cdk::generate!({path: "../../counter.did", service : Canister, trait: Counter});
+
+// Expand Start
+trait Counter {
+    fn inc();
+    fn read() -> u64;
+}
+
+#[export_name = "canister_update inc"]
+fn __canister_method_inc() {
+    ic_cdk::setup();
+    ic_cdk::spawn(async {
+        let _result = Canister::inc();
+        ic_cdk::api::call::reply(())
+    });
+}
+
+#[export_name = "canister_query read"]
+fn __canister_method_read() {
+    ic_cdk::setup();
+    ic_cdk::spawn(async {
+        let result = Canister::read();
+        ic_cdk::api::call::reply((result,))
+    });
+}
+// Expand End
+
+use std::cell::Cell;
+
+thread_local! {
+    static COUNTER: Cell<u64> = Cell::new(0);
+}
+
+struct Canister;
+
+impl Counter for Canister {
+    fn inc() {
+        COUNTER.set(COUNTER.get() + 1);
+    }
+
+    fn read() -> u64 {
+        COUNTER.get()
+    }
+}