Vendor dependencies for 0.3.0 release

vendor/pin-project/tests/ui/pin_project/packed-enum.rs

@@ -0,0 +1,26 @@
+// SPDX-License-Identifier: Apache-2.0 OR MIT
+
+use pin_project::pin_project;
+
+// #[repr(packed)] cannot be apply on enums and will be rejected by rustc.
+// However, we should not rely on the behavior of rustc that rejects this.
+// https://github.com/taiki-e/pin-project/pull/324#discussion_r612388001
+
+#[repr(packed)] //~ ERROR E0517
+enum E1 {
+    V(()),
+}
+
+#[pin_project]
+#[repr(packed)] //~ ERROR E0517
+enum E2 {
+    V(()),
+}
+
+#[repr(packed)] //~ ERROR E0517
+#[pin_project]
+enum E3 {
+    V(()),
+}
+
+fn main() {}