Vendor dependencies

Let's see how I like this workflow.

vendor/tokio/tests/macros_rename_test.rs

@@ -0,0 +1,26 @@
+#![cfg(all(feature = "full", not(tokio_wasi)))] // Wasi doesn't support threading
+
+#[allow(unused_imports)]
+use std as tokio;
+
+use ::tokio as tokio1;
+
+async fn compute() -> usize {
+    let join = tokio1::spawn(async { 1 });
+    join.await.unwrap()
+}
+
+#[tokio1::main(crate = "tokio1")]
+async fn compute_main() -> usize {
+    compute().await
+}
+
+#[test]
+fn crate_rename_main() {
+    assert_eq!(1, compute_main());
+}
+
+#[tokio1::test(crate = "tokio1")]
+async fn crate_rename_test() {
+    assert_eq!(1, compute().await);
+}