Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen-macro/ui-tests/unused-attributes.rs

@@ -0,0 +1,32 @@
+#![deny(unused_variables)]
+
+use wasm_bindgen::prelude::*;
+
+struct A {}
+
+#[wasm_bindgen]
+impl A {
+    #[wasm_bindgen(method)]
+    pub fn foo() {}
+}
+
+#[wasm_bindgen]
+pub struct MyStruct {
+    hello: String,
+}
+
+#[wasm_bindgen(getter, typescript_custom_section)]
+pub const FOO: &'static str = "FOO";
+
+#[wasm_bindgen(readonly)]
+pub fn bar() {}
+
+#[wasm_bindgen(getter_with_clone, final)]
+impl MyStruct {
+    #[wasm_bindgen(getter, typescript_type = "Thing[]")]
+    pub fn hello(&self) -> String {
+        self.hello.clone()
+    }
+}
+
+fn main() {}