Vendor dependencies

Let's see how I like this workflow.

vendor/pin-project-lite/tests/ui/pinned_drop/call-drop-inner.rs

@@ -0,0 +1,17 @@
+use pin_project_lite::pin_project;
+
+pin_project! {
+    pub struct S {
+        #[pin]
+        field: u8,
+    }
+    impl PinnedDrop for S {
+        fn drop(this: Pin<&mut Self>) {
+            __drop_inner(this);
+        }
+    }
+}
+
+fn main() {
+    let _x = S { field: 0 };
+}

vendor/pin-project-lite/tests/ui/pinned_drop/call-drop-inner.stderr

@@ -0,0 +1,22 @@
+error[E0061]: this function takes 0 arguments but 1 argument was supplied
+  --> tests/ui/pinned_drop/call-drop-inner.rs:10:13
+   |
+10 |             __drop_inner(this);
+   |             ^^^^^^^^^^^^ ---- argument unexpected
+   |
+note: function defined here
+  --> tests/ui/pinned_drop/call-drop-inner.rs:3:1
+   |
+3  | / pin_project! {
+4  | |     pub struct S {
+5  | |         #[pin]
+6  | |         field: u8,
+...  |
+12 | |     }
+13 | | }
+   | |_^
+   = note: this error originates in the macro `$crate::__pin_project_make_drop_impl` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: remove the extra argument
+   |
+10 |             __drop_inner();
+   |             ~~~~~~~~~~~~~~

vendor/pin-project-lite/tests/ui/pinned_drop/conditional-drop-impl.rs

@@ -0,0 +1,26 @@
+use pin_project_lite::pin_project;
+
+// In `Drop` impl, the implementor must specify the same requirement as type definition.
+
+struct DropImpl<T> {
+    f: T,
+}
+
+impl<T: Unpin> Drop for DropImpl<T> {
+    //~^ ERROR E0367
+    fn drop(&mut self) {}
+}
+
+pin_project! {
+    //~^ ERROR E0367
+    struct PinnedDropImpl<T> {
+        #[pin]
+        f: T,
+    }
+
+    impl<T: Unpin> PinnedDrop for PinnedDropImpl<T> {
+        fn drop(_this: Pin<&mut Self>) {}
+    }
+}
+
+fn main() {}

vendor/pin-project-lite/tests/ui/pinned_drop/conditional-drop-impl.stderr

@@ -0,0 +1,38 @@
+error[E0367]: `Drop` impl requires `T: Unpin` but the struct it is implemented for does not
+ --> tests/ui/pinned_drop/conditional-drop-impl.rs:9:9
+  |
+9 | impl<T: Unpin> Drop for DropImpl<T> {
+  |         ^^^^^
+  |
+note: the implementor must specify the same requirement
+ --> tests/ui/pinned_drop/conditional-drop-impl.rs:5:1
+  |
+5 | / struct DropImpl<T> {
+6 | |     f: T,
+7 | | }
+  | |_^
+
+error[E0367]: `Drop` impl requires `T: Unpin` but the struct it is implemented for does not
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:14:1
+   |
+14 | / pin_project! {
+15 | |     //~^ ERROR E0367
+16 | |     struct PinnedDropImpl<T> {
+17 | |         #[pin]
+...  |
+23 | |     }
+24 | | }
+   | |_^
+   |
+note: the implementor must specify the same requirement
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:14:1
+   |
+14 | / pin_project! {
+15 | |     //~^ ERROR E0367
+16 | |     struct PinnedDropImpl<T> {
+17 | |         #[pin]
+...  |
+23 | |     }
+24 | | }
+   | |_^
+   = note: this error originates in the macro `$crate::__pin_project_make_drop_impl` (in Nightly builds, run with -Z macro-backtrace for more info)