Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen-macro/ui-tests/invalid-enums.rs

@@ -0,0 +1,21 @@
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+enum A {}
+
+#[wasm_bindgen]
+pub enum B {
+    D(u32),
+}
+
+#[wasm_bindgen]
+pub enum C {
+    X = 1 + 3,
+}
+
+#[wasm_bindgen]
+pub enum D {
+    X = 4294967296,
+}
+
+fn main() {}