Vendor dependencies

Let's see how I like this workflow.

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

@@ -0,0 +1,15 @@
+use pin_project_lite::pin_project;
+
+pin_project! {
+#[project_replace = StructProjReplace]
+struct Struct<T, U> {
+    #[pin]
+    pinned1: T,
+    #[pin]
+    pinned2: T,
+    unpinned1: U,
+    unpinned2: U,
+}
+}
+
+fn main() {}