Vendor dependencies

Let's see how I like this workflow.

vendor/wasm-bindgen/tests/non_wasm.rs

@@ -0,0 +1,50 @@
+extern crate wasm_bindgen;
+
+use wasm_bindgen::prelude::*;
+
+#[wasm_bindgen]
+pub struct A {
+    x: u32,
+}
+
+#[wasm_bindgen]
+impl A {
+    pub fn new() -> A {
+        A { x: 3 }
+    }
+
+    pub fn foo(&self) {
+        drop(self.x);
+    }
+}
+
+#[wasm_bindgen]
+pub fn foo(x: bool) {
+    A::new().foo();
+
+    if x {
+        bar("test");
+        baz(JsValue::from(3));
+    }
+}
+
+#[wasm_bindgen]
+extern "C" {
+    fn some_import();
+    static A: JsValue;
+}
+
+#[wasm_bindgen]
+pub fn bar(_: &str) -> JsValue {
+    some_import();
+    A.clone()
+}
+
+#[wasm_bindgen]
+pub fn baz(_: JsValue) {}
+
+#[test]
+fn test_foo() {
+    foo(false);
+    A::new().foo();
+}