Vendor dependencies

Let's see how I like this workflow.

vendor/pin-project-lite/tests/expand/naming/enum-mut.rs

@@ -0,0 +1,15 @@
+use pin_project_lite::pin_project;
+
+pin_project! {
+    #[project = EnumProj]
+    enum Enum<T, U> {
+        Struct {
+            #[pin]
+            pinned: T,
+            unpinned: U,
+        },
+        Unit,
+    }
+}
+
+fn main() {}