Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen/tests/wasm/validate_prt.rs

@@ -0,0 +1,44 @@
+use wasm_bindgen::prelude::*;
+use wasm_bindgen_test::*;
+
+#[wasm_bindgen(module = "tests/wasm/validate_prt.js")]
+extern "C" {
+    fn js_works();
+}
+
+#[wasm_bindgen]
+pub struct Fruit {
+    name: String,
+}
+
+#[wasm_bindgen]
+impl Fruit {
+    pub fn name(&self) -> String {
+        self.name.clone()
+    }
+
+    #[wasm_bindgen(constructor)]
+    pub fn new(name: String) -> Self {
+        Fruit { name }
+    }
+
+    pub fn rot(self) {
+        drop(self);
+    }
+
+    #[wasm_bindgen(getter)]
+    pub fn prop(self) -> u32 {
+        0
+    }
+
+    #[wasm_bindgen(setter)]
+    pub fn set_prop(self, _val: u32) {}
+}
+
+#[wasm_bindgen]
+pub fn eat(_: Fruit) {}
+
+#[wasm_bindgen_test]
+fn works() {
+    js_works();
+}