Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen-macro/ui-tests/start-function.rs

@@ -0,0 +1,33 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen(start)]
+pub fn foo() {}
+
+#[wasm_bindgen(start)]
+pub fn foo2(x: u32) {}
+
+#[wasm_bindgen(start)]
+pub fn foo3<T>() {}
+
+#[wasm_bindgen(start)]
+pub fn foo4() -> Result<(), JsValue> { Ok(()) }
+
+#[wasm_bindgen(start)]
+pub fn foo5() -> Result<JsValue, ()> { Err(()) }
+
+#[wasm_bindgen(start)]
+pub fn foo6() -> Result<JsValue, JsValue> { Ok(JsValue::from(1u32)) }
+
+#[wasm_bindgen(start)]
+pub async fn foo_async1() {}
+
+#[wasm_bindgen(start)]
+pub async fn foo_async2() -> Result<(), JsValue> { Ok(()) }
+
+#[wasm_bindgen(start)]
+pub async fn foo_async3() -> Result<JsValue, ()> { Err(()) }
+
+#[wasm_bindgen(start)]
+pub async fn foo_async4() -> Result<JsValue, JsValue> { Ok(JsValue::from(1u32)) }
+
+fn main() {}