Vendor dependencies for 0.3.0 release

vendor/pin-project/tests/expand/pinned_drop/tuple_struct.rs

@@ -0,0 +1,17 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project(PinnedDrop)]
+struct TupleStruct<T, U>(#[pin] T, U);
+
+#[pinned_drop]
+impl<T, U> PinnedDrop for TupleStruct<T, U> {
+    fn drop(self: Pin<&mut Self>) {
+        let _ = self;
+    }
+}
+
+fn main() {}