Vendor dependencies

Let's see how I like this workflow.

vendor/pin-project-lite/tests/expand/pinned_drop/struct.rs

@@ -0,0 +1,17 @@
+use pin_project_lite::pin_project;
+use std::pin::Pin;
+
+pin_project! {
+    struct Struct<T, U> {
+        #[pin]
+        pinned: T,
+        unpinned: U,
+    }
+    impl<T, U> PinnedDrop for Struct<T, U> {
+        fn drop(this: Pin<&mut Self>) {
+            let _ = this;
+        }
+    }
+}
+
+fn main() {}