Vendor dependencies

Let's see how I like this workflow.

vendor/pin-project-lite/tests/include/basic.rs

@@ -0,0 +1,35 @@
+// default pin_project! is completely safe.
+
+::pin_project_lite::pin_project! {
+    #[derive(Debug)]
+    pub struct DefaultStruct<T, U> {
+        #[pin]
+        pub pinned: T,
+        pub unpinned: U,
+    }
+}
+
+::pin_project_lite::pin_project! {
+    #[project = DefaultStructProj]
+    #[project_ref = DefaultStructProjRef]
+    #[derive(Debug)]
+    pub struct DefaultStructNamed<T, U> {
+        #[pin]
+        pub pinned: T,
+        pub unpinned: U,
+    }
+}
+
+::pin_project_lite::pin_project! {
+    #[project = DefaultEnumProj]
+    #[project_ref = DefaultEnumProjRef]
+    #[derive(Debug)]
+    pub enum DefaultEnum<T, U> {
+        Struct {
+            #[pin]
+            pinned: T,
+            unpinned: U,
+        },
+        Unit,
+    }
+}