Adding upstream version 124.0.1.upstream/124.0.1

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

99 files changed, 3552 insertions, 0 deletions

diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.rs b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.rs
new file mode 100644
index 0000000000..e36cc9593a
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.rs
@@ -0,0 +1,11 @@
+use std::pin::Pin;
+
+#[cfg_attr(any(), pin_project::pin_project)]
+struct Foo<T> {
+    f: T,
+}
+
+fn main() {
+    let mut x = Foo { f: 0_u8 };
+    let _ = Pin::new(&mut x).project(); //~ ERROR E0599
+}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.stderr b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.stderr
new file mode 100644
index 0000000000..0393c143fe
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-resolve.stderr
@@ -0,0 +1,5 @@
+error[E0599]: no method named `project` found for struct `Pin<&mut Foo<u8>>` in the current scope
+  --> tests/ui/cfg/cfg_attr-resolve.rs:10:30
+   |
+10 |     let _ = Pin::new(&mut x).project(); //~ ERROR E0599
+   |                              ^^^^^^^ method not found in `Pin<&mut Foo<u8>>`
diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.rs b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.rs
new file mode 100644
index 0000000000..1b9664b544
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.rs
@@ -0,0 +1,25 @@
+use std::pin::Pin;
+
+use pin_project::pin_project;
+
+#[cfg_attr(not(any()), pin_project)]
+struct Foo<T> {
+    #[cfg_attr(any(), pin)]
+    f: T,
+}
+
+#[cfg_attr(not(any()), pin_project)]
+struct Bar<T> {
+    #[cfg_attr(not(any()), pin)]
+    f: T,
+}
+
+fn main() {
+    let mut x = Foo { f: 0_u8 };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut u8> = x.f; //~ ERROR E0308
+
+    let mut x = Bar { f: 0_u8 };
+    let x = Pin::new(&mut x).project();
+    let _: &mut u8 = x.f; //~ ERROR E0308
+}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.stderr b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.stderr
new file mode 100644
index 0000000000..081504c53f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.stderr
@@ -0,0 +1,25 @@
+error[E0308]: mismatched types
+  --> tests/ui/cfg/cfg_attr-type-mismatch.rs:20:27
+   |
+20 |     let _: Pin<&mut u8> = x.f; //~ ERROR E0308
+   |            ------------   ^^^ expected `Pin<&mut u8>`, found `&mut u8`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `Pin<&mut u8>`
+           found mutable reference `&mut u8`
+
+error[E0308]: mismatched types
+  --> tests/ui/cfg/cfg_attr-type-mismatch.rs:24:22
+   |
+24 |     let _: &mut u8 = x.f; //~ ERROR E0308
+   |            -------   ^^^ expected `&mut u8`, found `Pin<&mut u8>`
+   |            |
+   |            expected due to this
+   |
+   = note: expected mutable reference `&mut u8`
+                         found struct `Pin<&mut u8>`
+help: consider mutably borrowing here
+   |
+24 |     let _: &mut u8 = &mut x.f; //~ ERROR E0308
+   |                      ++++
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.rs b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.rs
new file mode 100644
index 0000000000..7e19952b6d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.rs
@@ -0,0 +1,15 @@
+use auxiliary_macro::hidden_repr;
+use pin_project::pin_project;
+
+#[pin_project]
+#[hidden_repr(packed)] //~ ERROR may not be used on #[repr(packed)] types
+struct S {
+    #[cfg(not(any()))]
+    #[pin]
+    f: u32,
+    #[cfg(any())]
+    #[pin]
+    f: u8,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.stderr b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.stderr
new file mode 100644
index 0000000000..4f3acc3494
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.stderr
@@ -0,0 +1,5 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> tests/ui/cfg/packed_sneaky-span-issue-1.rs:5:15
+  |
+5 | #[hidden_repr(packed)] //~ ERROR may not be used on #[repr(packed)] types
+  |               ^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.rs b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.rs
new file mode 100644
index 0000000000..fcea76bab8
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.rs
@@ -0,0 +1,15 @@
+use auxiliary_macro::hidden_repr;
+use pin_project::pin_project;
+
+#[pin_project]
+#[hidden_repr(packed)] //~ ERROR may not be used on #[repr(packed)] types
+struct S {
+    #[cfg(any())]
+    #[pin]
+    f: u32,
+    #[cfg(not(any()))]
+    #[pin]
+    f: u8,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.stderr b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.stderr
new file mode 100644
index 0000000000..cc2795ac68
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.stderr
@@ -0,0 +1,5 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> tests/ui/cfg/packed_sneaky-span-issue-2.rs:5:15
+  |
+5 | #[hidden_repr(packed)] //~ ERROR may not be used on #[repr(packed)] types
+  |               ^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.rs b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.rs
new file mode 100644
index 0000000000..0b01dc90e2
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.rs
@@ -0,0 +1,12 @@
+use auxiliary_macro::hidden_repr_cfg_not_any;
+use pin_project::pin_project;
+
+// `#[hidden_repr_cfg_not_any(packed)]` generates `#[cfg_attr(not(any()), repr(packed))]`.
+#[pin_project]
+#[hidden_repr_cfg_not_any(packed)] //~ ERROR may not be used on #[repr(packed)] types
+struct S {
+    #[pin]
+    f: u32,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.stderr b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.stderr
new file mode 100644
index 0000000000..a54c2ec2d2
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.stderr
@@ -0,0 +1,5 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> tests/ui/cfg/packed_sneaky.rs:6:27
+  |
+6 | #[hidden_repr_cfg_not_any(packed)] //~ ERROR may not be used on #[repr(packed)] types
+  |                           ^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/cfg/unsupported.rs b/third_party/rust/pin-project/tests/ui/cfg/unsupported.rs
new file mode 100644
index 0000000000..b950d4b828
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/unsupported.rs
@@ -0,0 +1,11 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct S {
+    //~^ ERROR may not be used on structs with zero fields
+    #[cfg(any())]
+    #[pin]
+    f: u8,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/unsupported.stderr b/third_party/rust/pin-project/tests/ui/cfg/unsupported.stderr
new file mode 100644
index 0000000000..e1c871c011
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/unsupported.stderr
@@ -0,0 +1,11 @@
+error: #[pin_project] attribute may not be used on structs with zero fields
+ --> tests/ui/cfg/unsupported.rs:4:10
+  |
+4 |   struct S {
+  |  __________^
+5 | |     //~^ ERROR may not be used on structs with zero fields
+6 | |     #[cfg(any())]
+7 | |     #[pin]
+8 | |     f: u8,
+9 | | }
+  | |_^
diff --git a/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.rs b/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.rs
new file mode 100644
index 0000000000..8985f37103
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.rs
@@ -0,0 +1,30 @@
+use pin_project::pin_project;
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T, U> Unpin for Foo<T, U> where T: Unpin {}
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T, U> Unpin for Bar<T, U> {}
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.stderr b/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.stderr
new file mode 100644
index 0000000000..4bd72bbdbf
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/not_unpin/conflict-unpin.stderr
@@ -0,0 +1,26 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Foo<_, _>`
+  --> tests/ui/not_unpin/conflict-unpin.rs:3:15
+   |
+3  | #[pin_project(!Unpin)] //~ ERROR E0119
+   |               ^^^^^^ conflicting implementation for `Foo<_, _>`
+...
+10 | impl<T, U> Unpin for Foo<T, U> where T: Unpin {}
+   | ------------------------------ first implementation here
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Bar<_, _>`
+  --> tests/ui/not_unpin/conflict-unpin.rs:12:15
+   |
+12 | #[pin_project(!Unpin)] //~ ERROR E0119
+   |               ^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+19 | impl<T, U> Unpin for Bar<T, U> {}
+   | ------------------------------ first implementation here
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Baz<_, _>`
+  --> tests/ui/not_unpin/conflict-unpin.rs:21:15
+   |
+21 | #[pin_project(!Unpin)] //~ ERROR E0119
+   |               ^^^^^^ conflicting implementation for `Baz<_, _>`
+...
+28 | impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {}
+   | -------------------------------------------- first implementation here
diff --git a/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.rs b/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.rs
new file mode 100644
index 0000000000..2c078c71ff
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.rs
@@ -0,0 +1,30 @@
+use pin_project::{pin_project, UnsafeUnpin};
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T, U> UnsafeUnpin for Foo<T, U> where T: Unpin {}
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T, U> UnsafeUnpin for Bar<T, U> {}
+
+#[pin_project(!Unpin)] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for Baz<T, U> {}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.stderr b/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.stderr
new file mode 100644
index 0000000000..f116eac673
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/not_unpin/impl-unsafe-unpin.stderr
@@ -0,0 +1,32 @@
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Foo<_, _>`
+  --> tests/ui/not_unpin/impl-unsafe-unpin.rs:3:1
+   |
+3  | #[pin_project(!Unpin)] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Foo<_, _>`
+...
+10 | unsafe impl<T, U> UnsafeUnpin for Foo<T, U> where T: Unpin {}
+   | ------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Bar<_, _>`
+  --> tests/ui/not_unpin/impl-unsafe-unpin.rs:12:1
+   |
+12 | #[pin_project(!Unpin)] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+19 | unsafe impl<T, U> UnsafeUnpin for Bar<T, U> {}
+   | ------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Baz<_, _>`
+  --> tests/ui/not_unpin/impl-unsafe-unpin.rs:21:1
+   |
+21 | #[pin_project(!Unpin)] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Baz<_, _>`
+...
+28 | unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for Baz<T, U> {}
+   | --------------------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.rs b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.rs
new file mode 100644
index 0000000000..32253d70f5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.rs
@@ -0,0 +1,20 @@
+use std::marker::PhantomPinned;
+
+use auxiliary_macro::add_pin_attr;
+use pin_project::pin_project;
+
+#[pin_project]
+#[add_pin_attr(struct)] //~ ERROR expected attribute arguments in parentheses
+struct Foo {
+    #[pin]
+    f: PhantomPinned,
+}
+
+#[add_pin_attr(struct)] //~ ERROR #[pin] attribute may only be used on fields of structs or variants
+#[pin_project]
+struct Bar {
+    #[pin]
+    f: PhantomPinned,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.stderr b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.stderr
new file mode 100644
index 0000000000..bb76c62d95
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.stderr
@@ -0,0 +1,15 @@
+error: expected attribute arguments in parentheses: `pin(...)`
+ --> tests/ui/pin_project/add-attr-to-struct.rs:7:1
+  |
+7 | #[add_pin_attr(struct)] //~ ERROR expected attribute arguments in parentheses
+  | ^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in the attribute macro `add_pin_attr` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> tests/ui/pin_project/add-attr-to-struct.rs:13:1
+   |
+13 | #[add_pin_attr(struct)] //~ ERROR #[pin] attribute may only be used on fields of structs or variants
+   | ^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in the attribute macro `add_pin_attr` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.rs b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.rs
new file mode 100644
index 0000000000..c415f9c904
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.rs
@@ -0,0 +1,23 @@
+use auxiliary_macro::add_pinned_field;
+use pin_project::pin_project;
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[add_pinned_field]
+struct Foo {
+    #[pin]
+    f: u32,
+}
+
+#[add_pinned_field]
+#[pin_project]
+struct Bar {
+    #[pin]
+    f: u32,
+}
+
+fn main() {
+    is_unpin::<Foo>(); //~ ERROR E0277
+    is_unpin::<Bar>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.stderr b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.stderr
new file mode 100644
index 0000000000..a38329d39b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.stderr
@@ -0,0 +1,54 @@
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/add-pinned-field.rs:21:16
+   |
+21 |     is_unpin::<Foo>(); //~ ERROR E0277
+   |                ^^^ within `__Foo<'_>`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `__Foo<'_>`
+  --> tests/ui/pin_project/add-pinned-field.rs:8:8
+   |
+8  | struct Foo {
+   |        ^^^
+note: required for `Foo` to implement `Unpin`
+  --> tests/ui/pin_project/add-pinned-field.rs:6:1
+   |
+6  | #[pin_project]
+   | ^^^^^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+7  | #[add_pinned_field]
+8  | struct Foo {
+   |        ^^^
+note: required by a bound in `is_unpin`
+  --> tests/ui/pin_project/add-pinned-field.rs:4:16
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ^^^^^ required by this bound in `is_unpin`
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/add-pinned-field.rs:22:16
+   |
+22 |     is_unpin::<Bar>(); //~ ERROR E0277
+   |                ^^^ within `__Bar<'_>`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `__Bar<'_>`
+  --> tests/ui/pin_project/add-pinned-field.rs:15:8
+   |
+15 | struct Bar {
+   |        ^^^
+note: required for `Bar` to implement `Unpin`
+  --> tests/ui/pin_project/add-pinned-field.rs:14:1
+   |
+14 | #[pin_project]
+   | ^^^^^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+15 | struct Bar {
+   |        ^^^
+note: required by a bound in `is_unpin`
+  --> tests/ui/pin_project/add-pinned-field.rs:4:16
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ^^^^^ required by this bound in `is_unpin`
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.rs b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.rs
new file mode 100644
index 0000000000..4fdb118d06
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.rs
@@ -0,0 +1,32 @@
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T, U> Drop for Foo<T, U> {
+    fn drop(&mut self) {}
+}
+
+#[pin_project(PinnedDrop)] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+#[pinned_drop]
+impl<T, U> PinnedDrop for Bar<T, U> {
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+impl<T, U> Drop for Bar<T, U> {
+    fn drop(&mut self) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.stderr b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.stderr
new file mode 100644
index 0000000000..79d4ca7ab1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.stderr
@@ -0,0 +1,19 @@
+error[E0119]: conflicting implementations of trait `FooMustNotImplDrop` for type `Foo<_, _>`
+ --> tests/ui/pin_project/conflict-drop.rs:5:1
+  |
+5 | #[pin_project] //~ ERROR E0119
+  | ^^^^^^^^^^^^^^
+  | |
+  | first implementation here
+  | conflicting implementation for `Foo<_, _>`
+  |
+  = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `Drop` for type `Bar<_, _>`
+  --> tests/ui/pin_project/conflict-drop.rs:16:15
+   |
+16 | #[pin_project(PinnedDrop)] //~ ERROR E0119
+   |               ^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+28 | impl<T, U> Drop for Bar<T, U> {
+   | ----------------------------- first implementation here
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.rs b/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.rs
new file mode 100644
index 0000000000..f58c45e09f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.rs
@@ -0,0 +1,37 @@
+use pin_project::pin_project;
+
+// The same implementation.
+
+#[pin_project] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+// conflicting implementations
+impl<T, U> Unpin for Foo<T, U> where T: Unpin {} // Conditional Unpin impl
+
+// The implementation that under different conditions.
+
+#[pin_project] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+// conflicting implementations
+impl<T, U> Unpin for Bar<T, U> {} // Non-conditional Unpin impl
+
+#[pin_project] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+// conflicting implementations
+impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {} // Conditional Unpin impl
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.stderr b/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.stderr
new file mode 100644
index 0000000000..0f26b68ce9
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-unpin.stderr
@@ -0,0 +1,32 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Foo<_, _>`
+  --> tests/ui/pin_project/conflict-unpin.rs:5:1
+   |
+5  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Foo<_, _>`
+...
+13 | impl<T, U> Unpin for Foo<T, U> where T: Unpin {} // Conditional Unpin impl
+   | ------------------------------ first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Bar<_, _>`
+  --> tests/ui/pin_project/conflict-unpin.rs:17:1
+   |
+17 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+25 | impl<T, U> Unpin for Bar<T, U> {} // Non-conditional Unpin impl
+   | ------------------------------ first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Baz<_, _>`
+  --> tests/ui/pin_project/conflict-unpin.rs:27:1
+   |
+27 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Baz<_, _>`
+...
+35 | impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {} // Conditional Unpin impl
+   | -------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.rs b/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.rs
new file mode 100644
index 0000000000..562c9b64f6
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.rs
@@ -0,0 +1,30 @@
+use pin_project::{pin_project, UnsafeUnpin};
+
+#[pin_project] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T, U> UnsafeUnpin for Foo<T, U> where T: Unpin {}
+
+#[pin_project] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T, U> UnsafeUnpin for Bar<T, U> {}
+
+#[pin_project] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for Baz<T, U> {}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.stderr b/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.stderr
new file mode 100644
index 0000000000..7e66b9e892
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/impl-unsafe-unpin.stderr
@@ -0,0 +1,32 @@
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Foo<_, _>`
+  --> tests/ui/pin_project/impl-unsafe-unpin.rs:3:1
+   |
+3  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Foo<_, _>`
+...
+10 | unsafe impl<T, U> UnsafeUnpin for Foo<T, U> where T: Unpin {}
+   | ------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Bar<_, _>`
+  --> tests/ui/pin_project/impl-unsafe-unpin.rs:12:1
+   |
+12 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+19 | unsafe impl<T, U> UnsafeUnpin for Bar<T, U> {}
+   | ------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `UnsafeUnpin` for type `Baz<_, _>`
+  --> tests/ui/pin_project/impl-unsafe-unpin.rs:21:1
+   |
+21 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Baz<_, _>`
+...
+28 | unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for Baz<T, U> {}
+   | --------------------------------------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.rs b/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.rs
new file mode 100644
index 0000000000..7926e61a63
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.rs
@@ -0,0 +1,30 @@
+/// Only named projected types can be imported.
+/// See visibility.rs for named projected types.
+
+mod pub_ {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    pub struct Default(());
+
+    #[pin_project(project_replace)]
+    pub struct Replace(());
+}
+#[allow(unused_imports)]
+pub mod use_ {
+    #[rustfmt::skip]
+    use crate::pub_::__DefaultProjection; //~ ERROR E0432
+    #[rustfmt::skip]
+    use crate::pub_::__DefaultProjectionRef; //~ ERROR E0432
+    #[rustfmt::skip]
+    use crate::pub_::__ReplaceProjection; //~ ERROR E0432
+    #[rustfmt::skip]
+    use crate::pub_::__ReplaceProjectionOwned; //~ ERROR E0432
+    #[rustfmt::skip]
+    use crate::pub_::__ReplaceProjectionRef; //~ ERROR E0432
+
+    // Confirm that the visibility of the original type is not changed.
+    pub use crate::pub_::{Default, Replace};
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.stderr b/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.stderr
new file mode 100644
index 0000000000..260a35a5c0
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/import_unnamed.stderr
@@ -0,0 +1,29 @@
+error[E0432]: unresolved import `crate::pub_::__DefaultProjection`
+  --> tests/ui/pin_project/import_unnamed.rs:16:9
+   |
+16 |     use crate::pub_::__DefaultProjection; //~ ERROR E0432
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `__DefaultProjection` in `pub_`
+
+error[E0432]: unresolved import `crate::pub_::__DefaultProjectionRef`
+  --> tests/ui/pin_project/import_unnamed.rs:18:9
+   |
+18 |     use crate::pub_::__DefaultProjectionRef; //~ ERROR E0432
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `__DefaultProjectionRef` in `pub_`
+
+error[E0432]: unresolved import `crate::pub_::__ReplaceProjection`
+  --> tests/ui/pin_project/import_unnamed.rs:20:9
+   |
+20 |     use crate::pub_::__ReplaceProjection; //~ ERROR E0432
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `__ReplaceProjection` in `pub_`
+
+error[E0432]: unresolved import `crate::pub_::__ReplaceProjectionOwned`
+  --> tests/ui/pin_project/import_unnamed.rs:22:9
+   |
+22 |     use crate::pub_::__ReplaceProjectionOwned; //~ ERROR E0432
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `__ReplaceProjectionOwned` in `pub_`
+
+error[E0432]: unresolved import `crate::pub_::__ReplaceProjectionRef`
+  --> tests/ui/pin_project/import_unnamed.rs:24:9
+   |
+24 |     use crate::pub_::__ReplaceProjectionRef; //~ ERROR E0432
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ no `__ReplaceProjectionRef` in `pub_`
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/invalid.rs b/third_party/rust/pin-project/tests/ui/pin_project/invalid.rs
new file mode 100644
index 0000000000..a850c57170
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/invalid.rs
@@ -0,0 +1,280 @@
+mod pin_argument {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    struct Struct {
+        #[pin()] //~ ERROR unexpected token in attribute
+        f: (),
+    }
+
+    #[pin_project]
+    struct TupleStruct(#[pin(foo)] ()); //~ ERROR unexpected token in attribute
+
+    #[pin_project]
+    enum EnumTuple {
+        V(#[pin(foo)] ()), //~ ERROR unexpected token in attribute
+    }
+
+    #[pin_project]
+    enum EnumStruct {
+        V {
+            #[pin(foo)] //~ ERROR unexpected token in attribute
+            f: (),
+        },
+    }
+}
+
+mod pin_attribute {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    struct DuplicateStruct {
+        #[pin]
+        #[pin] //~ ERROR duplicate #[pin] attribute
+        f: (),
+    }
+
+    #[pin_project]
+    struct DuplicateTupleStruct(
+        #[pin]
+        #[pin]
+        (),
+        //~^^ ERROR duplicate #[pin] attribute
+    );
+
+    #[pin_project]
+    enum DuplicateEnumTuple {
+        V(
+            #[pin]
+            #[pin]
+            (),
+            //~^^ ERROR duplicate #[pin] attribute
+        ),
+    }
+
+    #[pin_project]
+    enum DuplicateEnumStruct {
+        V {
+            #[pin]
+            #[pin] //~ ERROR duplicate #[pin] attribute
+            f: (),
+        },
+    }
+}
+
+mod pin_item {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    #[pin] //~ ERROR may only be used on fields of structs or variants
+    struct Struct {
+        #[pin]
+        f: (),
+    }
+
+    #[pin_project]
+    enum Variant {
+        #[pin] //~ ERROR may only be used on fields of structs or variants
+        V(()),
+    }
+
+    #[pin_project]
+    #[pin] //~ ERROR may only be used on fields of structs or variants
+    enum Enum {
+        V(()),
+    }
+}
+
+mod pin_project_argument {
+    use pin_project::pin_project;
+
+    #[pin_project(Replace)] //~ ERROR `Replace` argument was removed, use `project_replace` argument instead
+    struct RemovedReplace(#[pin] ());
+
+    #[pin_project(UnsafeUnpin,,)] //~ ERROR expected identifier
+    struct Unexpected1(#[pin] ());
+
+    #[pin_project(Foo)] //~ ERROR unexpected argument
+    struct Unexpected2(#[pin] ());
+
+    #[pin_project(,UnsafeUnpin)] //~ ERROR expected identifier
+    struct Unexpected3(#[pin] ());
+
+    #[pin_project()] // Ok
+    struct Unexpected4(#[pin] ());
+
+    #[pin_project(PinnedDrop PinnedDrop)] //~ ERROR expected `,`
+    struct Unexpected5(#[pin] ());
+
+    #[pin_project(PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+    struct DuplicatePinnedDrop(#[pin] ());
+
+    #[pin_project(UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+    struct DuplicateUnsafeUnpin(#[pin] ());
+
+    #[pin_project(!Unpin, !Unpin)] //~ ERROR duplicate `!Unpin` argument
+    struct DuplicateNotUnpin(#[pin] ());
+
+    #[pin_project(PinnedDrop, UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+    struct Duplicate3(#[pin] ());
+
+    #[pin_project(PinnedDrop, UnsafeUnpin, PinnedDrop, UnsafeUnpin)] //~ ERROR duplicate `PinnedDrop` argument
+    struct Duplicate4(#[pin] ());
+
+    #[pin_project(project = A, project = B)] //~ ERROR duplicate `project` argument
+    struct DuplicateProject(#[pin] ());
+
+    #[pin_project(project = A, project_ref = A, project = B)] //~ ERROR duplicate `project` argument
+    struct DuplicateProject2(#[pin] ());
+
+    #[pin_project(project_ref = A, project_ref = B)] //~ ERROR duplicate `project_ref` argument
+    struct DuplicateProjectRef(#[pin] ());
+
+    #[pin_project(project_replace = A, project_replace = B)] //~ ERROR duplicate `project_replace` argument
+    struct DuplicateProjectReplace1(#[pin] ());
+
+    #[pin_project(project_replace, project_replace = B)] //~ ERROR duplicate `project_replace` argument
+    struct DuplicateProjectReplace2(#[pin] ());
+
+    #[pin_project(project_replace = A, project_replace)] //~ ERROR duplicate `project_replace` argument
+    struct DuplicateProjectReplace3(#[pin] ());
+
+    #[pin_project(project_replace = A)] // Ok
+    struct ProjectReplaceWithoutReplace(#[pin] ());
+
+    #[pin_project(PinnedDrop, project_replace)] //~ ERROR arguments `PinnedDrop` and `project_replace` are mutually exclusive
+    struct PinnedDropWithProjectReplace1(#[pin] ());
+
+    #[pin_project(project_replace, UnsafeUnpin, PinnedDrop)] //~ ERROR arguments `PinnedDrop` and `project_replace` are mutually exclusive
+    struct PinnedDropWithProjectReplace2(#[pin] ());
+
+    #[pin_project(UnsafeUnpin, !Unpin)] //~ ERROR arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+    struct UnsafeUnpinWithNotUnpin1(#[pin] ());
+
+    #[pin_project(!Unpin, PinnedDrop, UnsafeUnpin)] //~ ERROR arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+    struct UnsafeUnpinWithNotUnpin2(#[pin] ());
+
+    #[pin_project(!)] //~ ERROR expected `!Unpin`, found `!`
+    struct NotUnpin1(#[pin] ());
+
+    #[pin_project(Unpin)] //~ ERROR unexpected argument
+    struct NotUnpin2(#[pin] ());
+
+    #[pin_project(project)] //~ ERROR expected `project = <identifier>`, found `project`
+    struct Project1(#[pin] ());
+
+    #[pin_project(project = )] //~ ERROR expected `project = <identifier>`, found `project =`
+    struct Project2(#[pin] ());
+
+    #[pin_project(project = !)] //~ ERROR expected identifier
+    struct Project3(#[pin] ());
+
+    #[pin_project(project_ref)] //~ ERROR expected `project_ref = <identifier>`, found `project_ref`
+    struct ProjectRef1(#[pin] ());
+
+    #[pin_project(project_ref = )] //~ ERROR expected `project_ref = <identifier>`, found `project_ref =`
+    struct ProjectRef2(#[pin] ());
+
+    #[pin_project(project_ref = !)] //~ ERROR expected identifier
+    struct ProjectRef3(#[pin] ());
+
+    #[pin_project(project_replace)] // Ok
+    struct ProjectReplace1(#[pin] ());
+
+    #[pin_project(project_replace = )] //~ ERROR expected `project_replace = <identifier>`, found `project_replace =`
+    struct ProjectReplace2(#[pin] ());
+
+    #[pin_project(project_replace = !)] //~ ERROR expected identifier
+    struct ProjectReplace3(#[pin] ());
+
+    #[pin_project(project_replace)] //~ ERROR `project_replace` argument requires a value when used on enums
+    enum ProjectReplaceEnum {
+        V(#[pin] ()),
+    }
+}
+
+mod pin_project_conflict_naming {
+    use pin_project::pin_project;
+
+    #[pin_project(project = OrigAndProj)] //~ ERROR name `OrigAndProj` is the same as the original type name
+    struct OrigAndProj(#[pin] ());
+
+    #[pin_project(project_ref = OrigAndProjRef)] //~ ERROR name `OrigAndProjRef` is the same as the original type name
+    struct OrigAndProjRef(#[pin] ());
+
+    #[pin_project(project_replace = OrigAndProjOwn)] //~ ERROR name `OrigAndProjOwn` is the same as the original type name
+    struct OrigAndProjOwn(#[pin] ());
+
+    #[pin_project(project = A, project_ref = A)] //~ ERROR name `A` is already specified by `project` argument
+    struct ProjAndProjRef(#[pin] ());
+
+    #[pin_project(project = A, project_replace = A)] //~ ERROR name `A` is already specified by `project` argument
+    struct ProjAndProjOwn(#[pin] ());
+
+    #[pin_project(project_ref = A, project_replace = A)] //~ ERROR name `A` is already specified by `project_ref` argument
+    struct ProjRefAndProjOwn(#[pin] ());
+}
+
+mod pin_project_attribute {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    #[pin_project] //~ ERROR duplicate #[pin_project] attribute
+    struct Duplicate(#[pin] ());
+}
+
+mod pin_project_item {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    struct Struct {} //~ ERROR may not be used on structs with zero fields
+
+    #[pin_project]
+    struct TupleStruct(); //~ ERROR may not be used on structs with zero fields
+
+    #[pin_project]
+    struct UnitStruct; //~ ERROR may not be used on structs with zero fields
+
+    #[pin_project]
+    enum EnumEmpty {} //~ ERROR may not be used on enums without variants
+
+    #[pin_project]
+    enum EnumDiscriminant {
+        V = 2, //~ ERROR may not be used on enums with discriminants
+    }
+
+    #[pin_project]
+    enum EnumZeroFields {
+        Unit, //~ ERROR may not be used on enums with zero fields
+        Tuple(),
+        Struct {},
+    }
+
+    #[pin_project]
+    union Union {
+        //~^ ERROR may only be used on structs or enums
+        f: (),
+    }
+
+    #[pin_project]
+    impl Impl {} //~ ERROR may only be used on structs or enums
+}
+
+// #[repr(packed)] is always detected first, even on unsupported structs.
+mod pin_project_item_packed {
+    use pin_project::pin_project;
+
+    #[pin_project]
+    #[repr(packed)]
+    struct Struct {} //~ ERROR may not be used on #[repr(packed)] types
+
+    #[pin_project]
+    #[repr(packed)]
+    struct TupleStruct(); //~ ERROR may not be used on #[repr(packed)] types
+
+    #[pin_project]
+    #[repr(packed)]
+    struct UnitStruct; //~ ERROR may not be used on #[repr(packed)] types
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/invalid.stderr b/third_party/rust/pin-project/tests/ui/pin_project/invalid.stderr
new file mode 100644
index 0000000000..ec5205f564
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/invalid.stderr
@@ -0,0 +1,364 @@
+error: unexpected token in attribute
+ --> tests/ui/pin_project/invalid.rs:6:14
+  |
+6 |         #[pin()] //~ ERROR unexpected token in attribute
+  |              ^
+
+error: unexpected token in attribute
+  --> tests/ui/pin_project/invalid.rs:11:29
+   |
+11 |     struct TupleStruct(#[pin(foo)] ()); //~ ERROR unexpected token in attribute
+   |                             ^
+
+error: unexpected token in attribute
+  --> tests/ui/pin_project/invalid.rs:15:16
+   |
+15 |         V(#[pin(foo)] ()), //~ ERROR unexpected token in attribute
+   |                ^
+
+error: unexpected token in attribute
+  --> tests/ui/pin_project/invalid.rs:21:18
+   |
+21 |             #[pin(foo)] //~ ERROR unexpected token in attribute
+   |                  ^
+
+error: duplicate #[pin] attribute
+  --> tests/ui/pin_project/invalid.rs:33:9
+   |
+33 |         #[pin] //~ ERROR duplicate #[pin] attribute
+   |         ^^^^^^
+
+error: duplicate #[pin] attribute
+  --> tests/ui/pin_project/invalid.rs:40:9
+   |
+40 |         #[pin]
+   |         ^^^^^^
+
+error: duplicate #[pin] attribute
+  --> tests/ui/pin_project/invalid.rs:49:13
+   |
+49 |             #[pin]
+   |             ^^^^^^
+
+error: duplicate #[pin] attribute
+  --> tests/ui/pin_project/invalid.rs:59:13
+   |
+59 |             #[pin] //~ ERROR duplicate #[pin] attribute
+   |             ^^^^^^
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> tests/ui/pin_project/invalid.rs:69:5
+   |
+69 |     #[pin] //~ ERROR may only be used on fields of structs or variants
+   |     ^^^^^^
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> tests/ui/pin_project/invalid.rs:77:9
+   |
+77 |         #[pin] //~ ERROR may only be used on fields of structs or variants
+   |         ^^^^^^
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> tests/ui/pin_project/invalid.rs:82:5
+   |
+82 |     #[pin] //~ ERROR may only be used on fields of structs or variants
+   |     ^^^^^^
+
+error: `Replace` argument was removed, use `project_replace` argument instead
+  --> tests/ui/pin_project/invalid.rs:91:19
+   |
+91 |     #[pin_project(Replace)] //~ ERROR `Replace` argument was removed, use `project_replace` argument instead
+   |                   ^^^^^^^
+
+error: expected identifier
+  --> tests/ui/pin_project/invalid.rs:94:31
+   |
+94 |     #[pin_project(UnsafeUnpin,,)] //~ ERROR expected identifier
+   |                               ^
+
+error: unexpected argument: Foo
+  --> tests/ui/pin_project/invalid.rs:97:19
+   |
+97 |     #[pin_project(Foo)] //~ ERROR unexpected argument
+   |                   ^^^
+
+error: expected identifier
+   --> tests/ui/pin_project/invalid.rs:100:19
+    |
+100 |     #[pin_project(,UnsafeUnpin)] //~ ERROR expected identifier
+    |                   ^
+
+error: expected `,`
+   --> tests/ui/pin_project/invalid.rs:106:30
+    |
+106 |     #[pin_project(PinnedDrop PinnedDrop)] //~ ERROR expected `,`
+    |                              ^^^^^^^^^^
+
+error: duplicate `PinnedDrop` argument
+   --> tests/ui/pin_project/invalid.rs:109:31
+    |
+109 |     #[pin_project(PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+    |                               ^^^^^^^^^^
+
+error: duplicate `UnsafeUnpin` argument
+   --> tests/ui/pin_project/invalid.rs:112:32
+    |
+112 |     #[pin_project(UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+    |                                ^^^^^^^^^^^
+
+error: duplicate `!Unpin` argument
+   --> tests/ui/pin_project/invalid.rs:115:27
+    |
+115 |     #[pin_project(!Unpin, !Unpin)] //~ ERROR duplicate `!Unpin` argument
+    |                           ^^^^^^
+
+error: duplicate `UnsafeUnpin` argument
+   --> tests/ui/pin_project/invalid.rs:118:44
+    |
+118 |     #[pin_project(PinnedDrop, UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+    |                                            ^^^^^^^^^^^
+
+error: duplicate `PinnedDrop` argument
+   --> tests/ui/pin_project/invalid.rs:121:44
+    |
+121 |     #[pin_project(PinnedDrop, UnsafeUnpin, PinnedDrop, UnsafeUnpin)] //~ ERROR duplicate `PinnedDrop` argument
+    |                                            ^^^^^^^^^^
+
+error: duplicate `project` argument
+   --> tests/ui/pin_project/invalid.rs:124:32
+    |
+124 |     #[pin_project(project = A, project = B)] //~ ERROR duplicate `project` argument
+    |                                ^^^^^^^^^^^
+
+error: duplicate `project` argument
+   --> tests/ui/pin_project/invalid.rs:127:49
+    |
+127 |     #[pin_project(project = A, project_ref = A, project = B)] //~ ERROR duplicate `project` argument
+    |                                                 ^^^^^^^^^^^
+
+error: duplicate `project_ref` argument
+   --> tests/ui/pin_project/invalid.rs:130:36
+    |
+130 |     #[pin_project(project_ref = A, project_ref = B)] //~ ERROR duplicate `project_ref` argument
+    |                                    ^^^^^^^^^^^^^^^
+
+error: duplicate `project_replace` argument
+   --> tests/ui/pin_project/invalid.rs:133:40
+    |
+133 |     #[pin_project(project_replace = A, project_replace = B)] //~ ERROR duplicate `project_replace` argument
+    |                                        ^^^^^^^^^^^^^^^^^^^
+
+error: duplicate `project_replace` argument
+   --> tests/ui/pin_project/invalid.rs:136:36
+    |
+136 |     #[pin_project(project_replace, project_replace = B)] //~ ERROR duplicate `project_replace` argument
+    |                                    ^^^^^^^^^^^^^^^^^^^
+
+error: duplicate `project_replace` argument
+   --> tests/ui/pin_project/invalid.rs:139:40
+    |
+139 |     #[pin_project(project_replace = A, project_replace)] //~ ERROR duplicate `project_replace` argument
+    |                                        ^^^^^^^^^^^^^^^
+
+error: arguments `PinnedDrop` and `project_replace` are mutually exclusive
+   --> tests/ui/pin_project/invalid.rs:145:19
+    |
+145 |     #[pin_project(PinnedDrop, project_replace)] //~ ERROR arguments `PinnedDrop` and `project_replace` are mutually exclusive
+    |                   ^^^^^^^^^^
+
+error: arguments `PinnedDrop` and `project_replace` are mutually exclusive
+   --> tests/ui/pin_project/invalid.rs:148:49
+    |
+148 |     #[pin_project(project_replace, UnsafeUnpin, PinnedDrop)] //~ ERROR arguments `PinnedDrop` and `project_replace` are mutually exclusive
+    |                                                 ^^^^^^^^^^
+
+error: arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+   --> tests/ui/pin_project/invalid.rs:151:19
+    |
+151 |     #[pin_project(UnsafeUnpin, !Unpin)] //~ ERROR arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+    |                   ^^^^^^^^^^^
+
+error: arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+   --> tests/ui/pin_project/invalid.rs:154:39
+    |
+154 |     #[pin_project(!Unpin, PinnedDrop, UnsafeUnpin)] //~ ERROR arguments `UnsafeUnpin` and `!Unpin` are mutually exclusive
+    |                                       ^^^^^^^^^^^
+
+error: expected `!Unpin`, found `!`
+   --> tests/ui/pin_project/invalid.rs:157:19
+    |
+157 |     #[pin_project(!)] //~ ERROR expected `!Unpin`, found `!`
+    |                   ^
+
+error: unexpected argument: Unpin
+   --> tests/ui/pin_project/invalid.rs:160:19
+    |
+160 |     #[pin_project(Unpin)] //~ ERROR unexpected argument
+    |                   ^^^^^
+
+error: expected `project = <identifier>`, found `project`
+   --> tests/ui/pin_project/invalid.rs:163:19
+    |
+163 |     #[pin_project(project)] //~ ERROR expected `project = <identifier>`, found `project`
+    |                   ^^^^^^^
+
+error: expected `project = <identifier>`, found `project =`
+   --> tests/ui/pin_project/invalid.rs:166:19
+    |
+166 |     #[pin_project(project = )] //~ ERROR expected `project = <identifier>`, found `project =`
+    |                   ^^^^^^^^^
+
+error: expected identifier
+   --> tests/ui/pin_project/invalid.rs:169:29
+    |
+169 |     #[pin_project(project = !)] //~ ERROR expected identifier
+    |                             ^
+
+error: expected `project_ref = <identifier>`, found `project_ref`
+   --> tests/ui/pin_project/invalid.rs:172:19
+    |
+172 |     #[pin_project(project_ref)] //~ ERROR expected `project_ref = <identifier>`, found `project_ref`
+    |                   ^^^^^^^^^^^
+
+error: expected `project_ref = <identifier>`, found `project_ref =`
+   --> tests/ui/pin_project/invalid.rs:175:19
+    |
+175 |     #[pin_project(project_ref = )] //~ ERROR expected `project_ref = <identifier>`, found `project_ref =`
+    |                   ^^^^^^^^^^^^^
+
+error: expected identifier
+   --> tests/ui/pin_project/invalid.rs:178:33
+    |
+178 |     #[pin_project(project_ref = !)] //~ ERROR expected identifier
+    |                                 ^
+
+error: expected `project_replace = <identifier>`, found `project_replace =`
+   --> tests/ui/pin_project/invalid.rs:184:19
+    |
+184 |     #[pin_project(project_replace = )] //~ ERROR expected `project_replace = <identifier>`, found `project_replace =`
+    |                   ^^^^^^^^^^^^^^^^^
+
+error: expected identifier
+   --> tests/ui/pin_project/invalid.rs:187:37
+    |
+187 |     #[pin_project(project_replace = !)] //~ ERROR expected identifier
+    |                                     ^
+
+error: `project_replace` argument requires a value when used on enums
+   --> tests/ui/pin_project/invalid.rs:190:19
+    |
+190 |     #[pin_project(project_replace)] //~ ERROR `project_replace` argument requires a value when used on enums
+    |                   ^^^^^^^^^^^^^^^
+
+error: name `OrigAndProj` is the same as the original type name
+   --> tests/ui/pin_project/invalid.rs:199:29
+    |
+199 |     #[pin_project(project = OrigAndProj)] //~ ERROR name `OrigAndProj` is the same as the original type name
+    |                             ^^^^^^^^^^^
+
+error: name `OrigAndProjRef` is the same as the original type name
+   --> tests/ui/pin_project/invalid.rs:202:33
+    |
+202 |     #[pin_project(project_ref = OrigAndProjRef)] //~ ERROR name `OrigAndProjRef` is the same as the original type name
+    |                                 ^^^^^^^^^^^^^^
+
+error: name `OrigAndProjOwn` is the same as the original type name
+   --> tests/ui/pin_project/invalid.rs:205:37
+    |
+205 |     #[pin_project(project_replace = OrigAndProjOwn)] //~ ERROR name `OrigAndProjOwn` is the same as the original type name
+    |                                     ^^^^^^^^^^^^^^
+
+error: name `A` is already specified by `project` argument
+   --> tests/ui/pin_project/invalid.rs:208:46
+    |
+208 |     #[pin_project(project = A, project_ref = A)] //~ ERROR name `A` is already specified by `project` argument
+    |                                              ^
+
+error: name `A` is already specified by `project` argument
+   --> tests/ui/pin_project/invalid.rs:211:50
+    |
+211 |     #[pin_project(project = A, project_replace = A)] //~ ERROR name `A` is already specified by `project` argument
+    |                                                  ^
+
+error: name `A` is already specified by `project_ref` argument
+   --> tests/ui/pin_project/invalid.rs:214:54
+    |
+214 |     #[pin_project(project_ref = A, project_replace = A)] //~ ERROR name `A` is already specified by `project_ref` argument
+    |                                                      ^
+
+error: duplicate #[pin_project] attribute
+   --> tests/ui/pin_project/invalid.rs:222:5
+    |
+222 |     #[pin_project] //~ ERROR duplicate #[pin_project] attribute
+    |     ^^^^^^^^^^^^^^
+
+error: #[pin_project] attribute may not be used on structs with zero fields
+   --> tests/ui/pin_project/invalid.rs:230:19
+    |
+230 |     struct Struct {} //~ ERROR may not be used on structs with zero fields
+    |                   ^^
+
+error: #[pin_project] attribute may not be used on structs with zero fields
+   --> tests/ui/pin_project/invalid.rs:233:23
+    |
+233 |     struct TupleStruct(); //~ ERROR may not be used on structs with zero fields
+    |                       ^^
+
+error: #[pin_project] attribute may not be used on structs with zero fields
+   --> tests/ui/pin_project/invalid.rs:236:12
+    |
+236 |     struct UnitStruct; //~ ERROR may not be used on structs with zero fields
+    |            ^^^^^^^^^^
+
+error: #[pin_project] attribute may not be used on enums without variants
+   --> tests/ui/pin_project/invalid.rs:239:20
+    |
+239 |     enum EnumEmpty {} //~ ERROR may not be used on enums without variants
+    |                    ^^
+
+error: #[pin_project] attribute may not be used on enums with discriminants
+   --> tests/ui/pin_project/invalid.rs:243:13
+    |
+243 |         V = 2, //~ ERROR may not be used on enums with discriminants
+    |             ^
+
+error: #[pin_project] attribute may not be used on enums with zero fields
+   --> tests/ui/pin_project/invalid.rs:248:9
+    |
+248 | /         Unit, //~ ERROR may not be used on enums with zero fields
+249 | |         Tuple(),
+250 | |         Struct {},
+    | |__________________^
+
+error: #[pin_project] attribute may only be used on structs or enums
+   --> tests/ui/pin_project/invalid.rs:254:5
+    |
+254 | /     union Union {
+255 | |         //~^ ERROR may only be used on structs or enums
+256 | |         f: (),
+257 | |     }
+    | |_____^
+
+error: #[pin_project] attribute may only be used on structs or enums
+   --> tests/ui/pin_project/invalid.rs:260:5
+    |
+260 |     impl Impl {} //~ ERROR may only be used on structs or enums
+    |     ^^^^^^^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+   --> tests/ui/pin_project/invalid.rs:268:12
+    |
+268 |     #[repr(packed)]
+    |            ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+   --> tests/ui/pin_project/invalid.rs:272:12
+    |
+272 |     #[repr(packed)]
+    |            ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+   --> tests/ui/pin_project/invalid.rs:276:12
+    |
+276 |     #[repr(packed)]
+    |            ^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.rs b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.rs
new file mode 100644
index 0000000000..abfd5d1344
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.rs
@@ -0,0 +1,19 @@
+use std::marker::PhantomPinned;
+
+use pin_project::pin_project;
+
+#[pin_project]
+struct S<T> {
+    #[pin]
+    f: T,
+}
+
+struct __S {}
+
+impl Unpin for __S {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<S<PhantomPinned>>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.stderr b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.stderr
new file mode 100644
index 0000000000..b9efd727f2
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.stderr
@@ -0,0 +1,26 @@
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/overlapping_unpin_struct.rs:18:16
+   |
+18 |     is_unpin::<S<PhantomPinned>>(); //~ ERROR E0277
+   |                ^^^^^^^^^^^^^^^^ within `_::__S<'_, PhantomPinned>`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `__S<'_, PhantomPinned>`
+  --> tests/ui/pin_project/overlapping_unpin_struct.rs:6:8
+   |
+6  | struct S<T> {
+   |        ^
+note: required for `S<PhantomPinned>` to implement `Unpin`
+  --> tests/ui/pin_project/overlapping_unpin_struct.rs:5:1
+   |
+5  | #[pin_project]
+   | ^^^^^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+6  | struct S<T> {
+   |        ^^^^
+note: required by a bound in `is_unpin`
+  --> tests/ui/pin_project/overlapping_unpin_struct.rs:15:16
+   |
+15 | fn is_unpin<T: Unpin>() {}
+   |                ^^^^^ required by this bound in `is_unpin`
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.rs b/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.rs
new file mode 100644
index 0000000000..890fd5b8de
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.rs
@@ -0,0 +1,32 @@
+// https://discord.com/channels/273534239310479360/512792629516173323/870075511009857617
+
+extern crate pin_project as pin_project_orig;
+extern crate self as pin_project;
+
+pub use ::pin_project_orig::*;
+mod __private {
+    pub use ::pin_project_orig::__private::*;
+    pub trait Drop {}
+}
+
+use std::{marker::PhantomPinned, mem};
+
+#[pin_project] //~ ERROR conflicting implementations of trait `_::FooMustNotImplDrop`
+struct S {
+    #[pin]
+    f: (u8, PhantomPinned),
+}
+
+impl Drop for S {
+    fn drop(&mut self) {
+        let prev = &self.f.0 as *const _ as usize;
+        let moved = mem::take(&mut self.f); // move pinned field
+        let moved = &moved.0 as *const _ as usize;
+        assert_eq!(prev, moved); // panic
+    }
+}
+
+fn main() {
+    let mut x = Box::pin(S { f: (1, PhantomPinned) });
+    let _f = x.as_mut().project().f; // first mutable access
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.stderr b/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.stderr
new file mode 100644
index 0000000000..0c4825b506
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/override-priv-mod.stderr
@@ -0,0 +1,10 @@
+error[E0119]: conflicting implementations of trait `SMustNotImplDrop` for type `S`
+  --> tests/ui/pin_project/override-priv-mod.rs:14:1
+   |
+14 | #[pin_project] //~ ERROR conflicting implementations of trait `_::FooMustNotImplDrop`
+   | ^^^^^^^^^^^^^^
+   | |
+   | first implementation here
+   | conflicting implementation for `S`
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.rs
new file mode 100644
index 0000000000..023c08d14f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.rs
@@ -0,0 +1,24 @@
+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() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.stderr
new file mode 100644
index 0000000000..1872211206
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed-enum.stderr
@@ -0,0 +1,42 @@
+error: #[repr(packed)] attribute should be applied to a struct or union
+  --> tests/ui/pin_project/packed-enum.rs:13:8
+   |
+13 | #[repr(packed)] //~ ERROR E0517
+   |        ^^^^^^
+
+error: #[repr(packed)] attribute should be applied to a struct or union
+  --> tests/ui/pin_project/packed-enum.rs:18:8
+   |
+18 | #[repr(packed)] //~ ERROR E0517
+   |        ^^^^^^
+
+error[E0517]: attribute should be applied to a struct or union
+  --> tests/ui/pin_project/packed-enum.rs:7:8
+   |
+7  |   #[repr(packed)] //~ ERROR E0517
+   |          ^^^^^^
+8  | / enum E1 {
+9  | |     V(()),
+10 | | }
+   | |_- not a struct or union
+
+error[E0517]: attribute should be applied to a struct or union
+  --> tests/ui/pin_project/packed-enum.rs:13:8
+   |
+13 |   #[repr(packed)] //~ ERROR E0517
+   |          ^^^^^^
+14 | / enum E2 {
+15 | |     V(()),
+16 | | }
+   | |_- not a struct or union
+
+error[E0517]: attribute should be applied to a struct or union
+  --> tests/ui/pin_project/packed-enum.rs:18:8
+   |
+18 |   #[repr(packed)] //~ ERROR E0517
+   |          ^^^^^^
+19 |   #[pin_project]
+20 | / enum E3 {
+21 | |     V(()),
+22 | | }
+   | |_- not a struct or union
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.rs
new file mode 100644
index 0000000000..dedc4030fa
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.rs
@@ -0,0 +1,27 @@
+use pin_project::pin_project;
+
+// #[repr(packed = "")] is not valid format of #[repr(packed)] 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
+
+// https://github.com/taiki-e/pin-project/pull/324#discussion_r612388001
+// https://github.com/rust-lang/rust/issues/83921
+// #[repr(packed = "")] //~ ERROR E0552
+// struct S1 {
+//     f: (),
+// }
+
+#[pin_project]
+#[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+struct S2 {
+    f: (),
+}
+
+#[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+#[pin_project]
+struct S3 {
+    f: (),
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.stderr
new file mode 100644
index 0000000000..d8b2194713
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed-name-value.stderr
@@ -0,0 +1,23 @@
+error: #[repr(packed)] attribute should not be name-value pair
+  --> tests/ui/pin_project/packed-name-value.rs:16:8
+   |
+16 | #[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+   |        ^^^^^^^^^^^
+
+error: #[repr(packed)] attribute should not be name-value pair
+  --> tests/ui/pin_project/packed-name-value.rs:21:8
+   |
+21 | #[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+   |        ^^^^^^^^^^^
+
+error[E0693]: incorrect `repr(packed)` attribute format
+  --> tests/ui/pin_project/packed-name-value.rs:16:8
+   |
+16 | #[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+   |        ^^^^^^^^^^^ help: use parentheses instead: `packed()`
+
+error[E0693]: incorrect `repr(packed)` attribute format
+  --> tests/ui/pin_project/packed-name-value.rs:21:8
+   |
+21 | #[repr(packed = "")] //~ ERROR attribute should not be name-value pair
+   |        ^^^^^^^^^^^ help: use parentheses instead: `packed()`
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed.rs
new file mode 100644
index 0000000000..dd3ebfd638
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed.rs
@@ -0,0 +1,33 @@
+use pin_project::pin_project;
+
+#[pin_project]
+#[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+struct Packed1 {
+    #[pin]
+    f: u8,
+}
+
+// Test putting 'repr' before the 'pin_project' attribute
+#[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+#[pin_project]
+struct Packed2 {
+    #[pin]
+    f: u8,
+}
+
+#[pin_project]
+#[repr(packed(2))] //~ ERROR may not be used on #[repr(packed)] types
+struct PackedN1 {
+    #[pin]
+    f: u32,
+}
+
+// Test putting 'repr' before the 'pin_project' attribute
+#[repr(packed(2))] //~ ERROR may not be used on #[repr(packed)] types
+#[pin_project]
+struct PackedN2 {
+    #[pin]
+    f: u32,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed.stderr
new file mode 100644
index 0000000000..25ea5f43e4
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed.stderr
@@ -0,0 +1,23 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> tests/ui/pin_project/packed.rs:4:8
+  |
+4 | #[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+  |        ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed.rs:11:8
+   |
+11 | #[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+   |        ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed.rs:19:8
+   |
+19 | #[repr(packed(2))] //~ ERROR may not be used on #[repr(packed)] types
+   |        ^^^^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed.rs:26:8
+   |
+26 | #[repr(packed(2))] //~ ERROR may not be used on #[repr(packed)] types
+   |        ^^^^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.rs
new file mode 100644
index 0000000000..83a46122cc
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.rs
@@ -0,0 +1,41 @@
+use std::pin::Pin;
+
+use auxiliary_macro::{hidden_repr, hidden_repr2};
+use pin_project::{pin_project, pinned_drop, UnsafeUnpin};
+
+#[pin_project] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct A {
+    #[pin]
+    f: u32,
+}
+
+#[hidden_repr2]
+#[pin_project] //~ ERROR may not be used on #[repr(packed)] types
+struct B {
+    #[pin]
+    f: u32,
+}
+
+#[pin_project(UnsafeUnpin)] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct C {
+    #[pin]
+    f: u32,
+}
+
+unsafe impl UnsafeUnpin for C {}
+
+#[pin_project(PinnedDrop)] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct D {
+    #[pin]
+    f: u32,
+}
+
+#[pinned_drop]
+impl PinnedDrop for D {
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.stderr
new file mode 100644
index 0000000000..0746e1a21c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.stderr
@@ -0,0 +1,25 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> tests/ui/pin_project/packed_sneaky-1.rs:7:15
+  |
+7 | #[hidden_repr(packed)]
+  |               ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed_sneaky-1.rs:13:1
+   |
+13 | #[hidden_repr2]
+   | ^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in the attribute macro `hidden_repr2` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed_sneaky-1.rs:21:15
+   |
+21 | #[hidden_repr(packed)]
+   |               ^^^^^^
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed_sneaky-1.rs:30:15
+   |
+30 | #[hidden_repr(packed)]
+   |               ^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.rs
new file mode 100644
index 0000000000..b098358e6f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.rs
@@ -0,0 +1,12 @@
+use auxiliary_macro::hidden_repr_macro;
+use pin_project::pin_project;
+
+hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
+    #[pin_project]
+    struct B {
+        #[pin]
+        f: u32,
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.stderr
new file mode 100644
index 0000000000..d643052fda
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.stderr
@@ -0,0 +1,13 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> tests/ui/pin_project/packed_sneaky-2.rs:4:1
+   |
+4  | / hidden_repr_macro! { //~ ERROR may not be used on #[repr(packed)] types
+5  | |     #[pin_project]
+6  | |     struct B {
+7  | |         #[pin]
+8  | |         f: u32,
+9  | |     }
+10 | | }
+   | |_^
+   |
+   = note: this error originates in the macro `hidden_repr_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.rs
new file mode 100644
index 0000000000..d3f00f3d23
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.rs
@@ -0,0 +1,32 @@
+use auxiliary_macro::{hidden_repr_macro, HiddenRepr};
+use pin_project::pin_project;
+
+hidden_repr_macro! {} //~ ERROR expected item after attributes
+#[pin_project]
+struct S1 {
+    #[pin]
+    f: u32,
+}
+
+macro_rules! hidden_repr_macro2 {
+    () => {
+        #[repr(packed)] //~ ERROR expected item after attributes
+    };
+}
+
+hidden_repr_macro2! {}
+#[pin_project]
+struct S2 {
+    #[pin]
+    f: u32,
+}
+
+#[derive(HiddenRepr)] //~ ERROR expected item after attributes
+struct S3 {}
+#[pin_project]
+struct S4 {
+    #[pin]
+    f: u32,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.stderr
new file mode 100644
index 0000000000..c181bb3152
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-3.stderr
@@ -0,0 +1,32 @@
+error: expected item after attributes
+ --> tests/ui/pin_project/packed_sneaky-3.rs:4:1
+  |
+4 | hidden_repr_macro! {} //~ ERROR expected item after attributes
+  | ^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in the macro `hidden_repr_macro` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: expected item after attributes
+  --> tests/ui/pin_project/packed_sneaky-3.rs:13:9
+   |
+13 |         #[repr(packed)] //~ ERROR expected item after attributes
+   |         ^^^^^^^^^^^^^^^
+...
+17 | hidden_repr_macro2! {}
+   | ---------------------- in this macro invocation
+   |
+   = note: this error originates in the macro `hidden_repr_macro2` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: expected item after attributes
+  --> tests/ui/pin_project/packed_sneaky-3.rs:24:10
+   |
+24 | #[derive(HiddenRepr)] //~ ERROR expected item after attributes
+   |          ^^^^^^^^^^
+   |
+   = note: this error originates in the derive macro `HiddenRepr` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: proc-macro derive produced unparsable tokens
+  --> tests/ui/pin_project/packed_sneaky-3.rs:24:10
+   |
+24 | #[derive(HiddenRepr)] //~ ERROR expected item after attributes
+   |          ^^^^^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.rs
new file mode 100644
index 0000000000..4f409071ea
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.rs
@@ -0,0 +1,13 @@
+// https://github.com/taiki-e/pin-project/issues/342
+
+use auxiliary_macro::hidden_repr2;
+use pin_project::pin_project;
+
+#[pin_project] //~ ERROR reference to packed field is unaligned
+#[hidden_repr2]
+struct A {
+    #[pin]
+    f: u32,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.stderr b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.stderr
new file mode 100644
index 0000000000..2c24367c44
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-4.stderr
@@ -0,0 +1,20 @@
+error[E0793]: reference to packed field is unaligned
+  --> tests/ui/pin_project/packed_sneaky-4.rs:10:5
+   |
+10 |     f: u32,
+   |     ^
+   |
+   = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+   = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
+
+error[E0793]: reference to packed field is unaligned
+ --> tests/ui/pin_project/packed_sneaky-4.rs:6:1
+  |
+6 | #[pin_project] //~ ERROR reference to packed field is unaligned
+  | ^^^^^^^^^^^^^^
+  |
+  = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+  = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+  = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
+  = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.rs b/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.rs
new file mode 100644
index 0000000000..d55baebad1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.rs
@@ -0,0 +1,23 @@
+// Even if allows private_in_public, these are errors.
+
+#![allow(private_in_public, dead_code)]
+
+pub enum PublicEnum {
+    V(PrivateEnum), //~ ERROR E0446
+}
+
+enum PrivateEnum {
+    V(u8),
+}
+
+mod foo {
+    pub(crate) enum CrateEnum {
+        V(PrivateEnum), //~ ERROR E0446
+    }
+
+    enum PrivateEnum {
+        V(u8),
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.stderr b/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.stderr
new file mode 100644
index 0000000000..c93b265916
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/private_in_public-enum.stderr
@@ -0,0 +1,17 @@
+error[E0446]: private type `PrivateEnum` in public interface
+ --> tests/ui/pin_project/private_in_public-enum.rs:6:7
+  |
+6 |     V(PrivateEnum), //~ ERROR E0446
+  |       ^^^^^^^^^^^ can't leak private type
+...
+9 | enum PrivateEnum {
+  | ---------------- `PrivateEnum` declared as private
+
+error[E0446]: private type `foo::PrivateEnum` in public interface
+  --> tests/ui/pin_project/private_in_public-enum.rs:15:11
+   |
+15 |         V(PrivateEnum), //~ ERROR E0446
+   |           ^^^^^^^^^^^ can't leak private type
+...
+18 |     enum PrivateEnum {
+   |     ---------------- `foo::PrivateEnum` declared as private
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.rs b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.rs
new file mode 100644
index 0000000000..20dde12bd3
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.rs
@@ -0,0 +1,11 @@
+use pin_project::pin_project;
+
+#[pin_project(project_replace)] //~ ERROR E0277
+struct Struct<T: ?Sized> {
+    f: T,
+}
+
+#[pin_project(project_replace)] //~ ERROR E0277
+struct TupleStruct<T: ?Sized>(T);
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.stderr b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.stderr
new file mode 100644
index 0000000000..b6c6da322d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized.stderr
@@ -0,0 +1,124 @@
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized.rs:3:15
+  |
+3 | #[pin_project(project_replace)] //~ ERROR E0277
+  |               ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+4 | struct Struct<T: ?Sized> {
+  |               - this type parameter needs to be `std::marker::Sized`
+  |
+note: required because it appears within the type `Struct<T>`
+ --> tests/ui/pin_project/project_replace_unsized.rs:4:8
+  |
+4 | struct Struct<T: ?Sized> {
+  |        ^^^^^^
+  = help: unsized fn params are gated as an unstable feature
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+  |
+4 - struct Struct<T: ?Sized> {
+4 + struct Struct<T> {
+  |
+help: function arguments must have a statically known size, borrowed types always have a known size
+  |
+3 | #[pin_project(&project_replace)] //~ ERROR E0277
+  |               +
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized.rs:3:1
+  |
+3 | #[pin_project(project_replace)] //~ ERROR E0277
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+4 | struct Struct<T: ?Sized> {
+  |               - this type parameter needs to be `std::marker::Sized`
+  |
+note: required because it appears within the type `Struct<T>`
+ --> tests/ui/pin_project/project_replace_unsized.rs:4:8
+  |
+4 | struct Struct<T: ?Sized> {
+  |        ^^^^^^
+note: required by a bound in `UnsafeOverwriteGuard::<T>::new`
+ --> src/lib.rs
+  |
+  |     impl<T> UnsafeOverwriteGuard<T> {
+  |          ^ required by this bound in `UnsafeOverwriteGuard::<T>::new`
+  |         #[doc(hidden)]
+  |         pub unsafe fn new(target: *mut T, value: T) -> Self {
+  |                       --- required by a bound in this associated function
+  = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+    |
+4   - struct Struct<T: ?Sized> {
+4   + struct Struct<T> {
+    |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized.rs:5:5
+  |
+3 | #[pin_project(project_replace)] //~ ERROR E0277
+  | ------------------------------- required by a bound introduced by this call
+4 | struct Struct<T: ?Sized> {
+  |               - this type parameter needs to be `std::marker::Sized`
+5 |     f: T,
+  |     ^ doesn't have a size known at compile-time
+  |
+note: required by a bound in `std::ptr::read`
+ --> $RUST/core/src/ptr/mod.rs
+  |
+  | pub const unsafe fn read<T>(src: *const T) -> T {
+  |                          ^ required by this bound in `read`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+     |
+4    - struct Struct<T: ?Sized> {
+4    + struct Struct<T> {
+     |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized.rs:8:15
+  |
+8 | #[pin_project(project_replace)] //~ ERROR E0277
+  |               ^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+9 | struct TupleStruct<T: ?Sized>(T);
+  |                    - this type parameter needs to be `std::marker::Sized`
+  |
+note: required because it appears within the type `TupleStruct<T>`
+ --> tests/ui/pin_project/project_replace_unsized.rs:9:8
+  |
+9 | struct TupleStruct<T: ?Sized>(T);
+  |        ^^^^^^^^^^^
+  = help: unsized fn params are gated as an unstable feature
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+  |
+9 - struct TupleStruct<T: ?Sized>(T);
+9 + struct TupleStruct<T>(T);
+  |
+help: function arguments must have a statically known size, borrowed types always have a known size
+  |
+8 | #[pin_project(&project_replace)] //~ ERROR E0277
+  |               +
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized.rs:8:1
+  |
+8 | #[pin_project(project_replace)] //~ ERROR E0277
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+9 | struct TupleStruct<T: ?Sized>(T);
+  |                    - this type parameter needs to be `std::marker::Sized`
+  |
+note: required because it appears within the type `TupleStruct<T>`
+ --> tests/ui/pin_project/project_replace_unsized.rs:9:8
+  |
+9 | struct TupleStruct<T: ?Sized>(T);
+  |        ^^^^^^^^^^^
+note: required by a bound in `UnsafeOverwriteGuard::<T>::new`
+ --> src/lib.rs
+  |
+  |     impl<T> UnsafeOverwriteGuard<T> {
+  |          ^ required by this bound in `UnsafeOverwriteGuard::<T>::new`
+  |         #[doc(hidden)]
+  |         pub unsafe fn new(target: *mut T, value: T) -> Self {
+  |                       --- required by a bound in this associated function
+  = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+    |
+9   - struct TupleStruct<T: ?Sized>(T);
+9   + struct TupleStruct<T>(T);
+    |
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.rs b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.rs
new file mode 100644
index 0000000000..e0fa25bf7d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.rs
@@ -0,0 +1,13 @@
+#![feature(unsized_fn_params)]
+
+use pin_project::pin_project;
+
+#[pin_project(project_replace)] //~ ERROR E0277
+struct Struct<T: ?Sized> {
+    f: T,
+}
+
+#[pin_project(project_replace)] //~ ERROR E0277
+struct TupleStruct<T: ?Sized>(T);
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.stderr b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.stderr
new file mode 100644
index 0000000000..bef6ff9ebc
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/project_replace_unsized_fn_params.stderr
@@ -0,0 +1,118 @@
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:6:8
+  |
+6 | struct Struct<T: ?Sized> {
+  |        ^^^^^^^-^^^^^^^^^
+  |        |      |
+  |        |      this type parameter needs to be `std::marker::Sized`
+  |        doesn't have a size known at compile-time
+  |
+note: required because it appears within the type `__StructProjectionOwned<T>`
+ --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:6:8
+  |
+6 | struct Struct<T: ?Sized> {
+  |        ^^^^^^
+  = note: the return type of a function must have a statically known size
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+  |
+6 - struct Struct<T: ?Sized> {
+6 + struct Struct<T> {
+  |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:5:1
+  |
+5 | #[pin_project(project_replace)] //~ ERROR E0277
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+6 | struct Struct<T: ?Sized> {
+  |               - this type parameter needs to be `std::marker::Sized`
+  |
+note: required because it appears within the type `Struct<T>`
+ --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:6:8
+  |
+6 | struct Struct<T: ?Sized> {
+  |        ^^^^^^
+note: required by a bound in `UnsafeOverwriteGuard::<T>::new`
+ --> src/lib.rs
+  |
+  |     impl<T> UnsafeOverwriteGuard<T> {
+  |          ^ required by this bound in `UnsafeOverwriteGuard::<T>::new`
+  |         #[doc(hidden)]
+  |         pub unsafe fn new(target: *mut T, value: T) -> Self {
+  |                       --- required by a bound in this associated function
+  = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+    |
+6   - struct Struct<T: ?Sized> {
+6   + struct Struct<T> {
+    |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+ --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:7:5
+  |
+5 | #[pin_project(project_replace)] //~ ERROR E0277
+  | ------------------------------- required by a bound introduced by this call
+6 | struct Struct<T: ?Sized> {
+  |               - this type parameter needs to be `std::marker::Sized`
+7 |     f: T,
+  |     ^ doesn't have a size known at compile-time
+  |
+note: required by a bound in `std::ptr::read`
+ --> $RUST/core/src/ptr/mod.rs
+  |
+  | pub const unsafe fn read<T>(src: *const T) -> T {
+  |                          ^ required by this bound in `read`
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+     |
+6    - struct Struct<T: ?Sized> {
+6    + struct Struct<T> {
+     |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:11:8
+   |
+11 | struct TupleStruct<T: ?Sized>(T);
+   |        ^^^^^^^^^^^^-^^^^^^^^^
+   |        |           |
+   |        |           this type parameter needs to be `std::marker::Sized`
+   |        doesn't have a size known at compile-time
+   |
+note: required because it appears within the type `__TupleStructProjectionOwned<T>`
+  --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:11:8
+   |
+11 | struct TupleStruct<T: ?Sized>(T);
+   |        ^^^^^^^^^^^
+   = note: the return type of a function must have a statically known size
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+   |
+11 - struct TupleStruct<T: ?Sized>(T);
+11 + struct TupleStruct<T>(T);
+   |
+
+error[E0277]: the size for values of type `T` cannot be known at compilation time
+  --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:10:1
+   |
+10 | #[pin_project(project_replace)] //~ ERROR E0277
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
+11 | struct TupleStruct<T: ?Sized>(T);
+   |                    - this type parameter needs to be `std::marker::Sized`
+   |
+note: required because it appears within the type `TupleStruct<T>`
+  --> tests/ui/pin_project/project_replace_unsized_fn_params.rs:11:8
+   |
+11 | struct TupleStruct<T: ?Sized>(T);
+   |        ^^^^^^^^^^^
+note: required by a bound in `UnsafeOverwriteGuard::<T>::new`
+  --> src/lib.rs
+   |
+   |     impl<T> UnsafeOverwriteGuard<T> {
+   |          ^ required by this bound in `UnsafeOverwriteGuard::<T>::new`
+   |         #[doc(hidden)]
+   |         pub unsafe fn new(target: *mut T, value: T) -> Self {
+   |                       --- required by a bound in this associated function
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider removing the `?Sized` bound to make the type parameter `Sized`
+    |
+11  - struct TupleStruct<T: ?Sized>(T);
+11  + struct TupleStruct<T>(T);
+    |
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.rs b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.rs
new file mode 100644
index 0000000000..fd14da37c1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.rs
@@ -0,0 +1,33 @@
+use std::{marker::PhantomPinned, pin::Pin};
+
+use auxiliary_macro::remove_attr;
+use pin_project::pin_project;
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[remove_attr(field_all)]
+struct A {
+    #[pin]
+    f: PhantomPinned,
+}
+
+#[remove_attr(field_all)]
+#[pin_project]
+struct B {
+    #[pin]
+    f: PhantomPinned,
+}
+
+fn main() {
+    is_unpin::<A>();
+    is_unpin::<B>();
+
+    let mut x = A { f: PhantomPinned };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut PhantomPinned> = x.f; //~ ERROR E0308
+
+    let mut x = B { f: PhantomPinned };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut PhantomPinned> = x.f; //~ ERROR E0308
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.stderr b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.stderr
new file mode 100644
index 0000000000..f693261ad7
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.stderr
@@ -0,0 +1,21 @@
+error[E0308]: mismatched types
+  --> tests/ui/pin_project/remove-attr-from-field.rs:28:38
+   |
+28 |     let _: Pin<&mut PhantomPinned> = x.f; //~ ERROR E0308
+   |            -----------------------   ^^^ expected `Pin<&mut PhantomPinned>`, found `&mut PhantomPinned`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `Pin<&mut PhantomPinned>`
+           found mutable reference `&mut PhantomPinned`
+
+error[E0308]: mismatched types
+  --> tests/ui/pin_project/remove-attr-from-field.rs:32:38
+   |
+32 |     let _: Pin<&mut PhantomPinned> = x.f; //~ ERROR E0308
+   |            -----------------------   ^^^ expected `Pin<&mut PhantomPinned>`, found `&mut PhantomPinned`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `Pin<&mut PhantomPinned>`
+           found mutable reference `&mut PhantomPinned`
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.rs b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.rs
new file mode 100644
index 0000000000..cbe5aba234
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.rs
@@ -0,0 +1,47 @@
+use std::{marker::PhantomPinned, pin::Pin};
+
+use auxiliary_macro::remove_attr;
+use pin_project::pin_project;
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[remove_attr(struct_all)]
+struct A {
+    #[pin] //~ ERROR cannot find attribute `pin` in this scope
+    f: PhantomPinned,
+}
+
+#[remove_attr(struct_all)]
+#[pin_project]
+struct B {
+    #[pin] //~ ERROR cannot find attribute `pin` in this scope
+    f: PhantomPinned,
+}
+
+#[pin_project] //~ ERROR has been removed
+#[remove_attr(struct_pin)]
+struct C {
+    f: PhantomPinned,
+}
+
+#[remove_attr(struct_pin)]
+#[pin_project] // Ok
+struct D {
+    f: PhantomPinned,
+}
+
+fn main() {
+    is_unpin::<A>(); //~ ERROR E0277
+    is_unpin::<B>(); //~ ERROR E0277
+    is_unpin::<D>(); // Ok
+
+    let mut x = A { f: PhantomPinned };
+    let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+
+    let mut x = B { f: PhantomPinned };
+    let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+
+    let mut x = D { f: PhantomPinned };
+    let _ = Pin::new(&mut x).project(); //~ Ok
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.stderr b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.stderr
new file mode 100644
index 0000000000..0b440dd9f9
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.stderr
@@ -0,0 +1,117 @@
+error: #[pin_project] attribute has been removed
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:22:1
+   |
+22 | #[pin_project] //~ ERROR has been removed
+   | ^^^^^^^^^^^^^^
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: cannot find attribute `pin` in this scope
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:18:7
+   |
+18 |     #[pin] //~ ERROR cannot find attribute `pin` in this scope
+   |       ^^^
+
+error: cannot find attribute `pin` in this scope
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:11:7
+   |
+11 |     #[pin] //~ ERROR cannot find attribute `pin` in this scope
+   |       ^^^
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:35:16
+   |
+35 |     is_unpin::<A>(); //~ ERROR E0277
+   |                ^ within `A`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `A`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:10:8
+   |
+10 | struct A {
+   |        ^
+note: required by a bound in `is_unpin`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:6:16
+   |
+6  | fn is_unpin<T: Unpin>() {}
+   |                ^^^^^ required by this bound in `is_unpin`
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:36:16
+   |
+36 |     is_unpin::<B>(); //~ ERROR E0277
+   |                ^ within `B`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `B`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:17:8
+   |
+17 | struct B {
+   |        ^
+note: required by a bound in `is_unpin`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:6:16
+   |
+6  | fn is_unpin<T: Unpin>() {}
+   |                ^^^^^ required by this bound in `is_unpin`
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:40:22
+   |
+40 |     let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |             -------- ^^^^^^ within `A`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |             |
+   |             required by a bound introduced by this call
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `A`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:10:8
+   |
+10 | struct A {
+   |        ^
+note: required by a bound in `Pin::<P>::new`
+  --> $RUST/core/src/pin.rs
+   |
+   | impl<P: Deref<Target: Unpin>> Pin<P> {
+   |                       ^^^^^ required by this bound in `Pin::<P>::new`
+...
+   |     pub const fn new(pointer: P) -> Pin<P> {
+   |                  --- required by a bound in this associated function
+
+error[E0599]: no method named `project` found for struct `Pin<&mut A>` in the current scope
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:40:30
+   |
+40 |     let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |                              ^^^^^^^ method not found in `Pin<&mut A>`
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:43:22
+   |
+43 |     let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |             -------- ^^^^^^ within `B`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |             |
+   |             required by a bound introduced by this call
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `B`
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:17:8
+   |
+17 | struct B {
+   |        ^
+note: required by a bound in `Pin::<P>::new`
+  --> $RUST/core/src/pin.rs
+   |
+   | impl<P: Deref<Target: Unpin>> Pin<P> {
+   |                       ^^^^^ required by this bound in `Pin::<P>::new`
+...
+   |     pub const fn new(pointer: P) -> Pin<P> {
+   |                  --- required by a bound in this associated function
+
+error[E0599]: no method named `project` found for struct `Pin<&mut B>` in the current scope
+  --> tests/ui/pin_project/remove-attr-from-struct.rs:43:30
+   |
+43 |     let _ = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |                              ^^^^^^^ method not found in `Pin<&mut B>`
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.rs b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.rs
new file mode 100644
index 0000000000..8ef144cce1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.rs
@@ -0,0 +1,25 @@
+#![deny(renamed_and_removed_lints)]
+#![deny(safe_packed_borrows)] //~ ERROR has been renamed to `unaligned_references`
+
+// This lint was removed in https://github.com/rust-lang/rust/pull/82525 (nightly-2021-03-28).
+// Refs:
+// - https://github.com/rust-lang/rust/pull/82525
+// - https://github.com/rust-lang/rust/issues/46043
+
+#[repr(packed)]
+struct Packed {
+    f: u32,
+}
+
+#[repr(packed(2))]
+struct PackedN {
+    f: u32,
+}
+
+fn main() {
+    let a = Packed { f: 1 };
+    let _ = &a.f;
+
+    let b = PackedN { f: 1 };
+    let _ = &b.f;
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.stderr b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.stderr
new file mode 100644
index 0000000000..26e6f8d74c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.stderr
@@ -0,0 +1,31 @@
+error: lint `safe_packed_borrows` has been removed: converted into hard error, see issue #82523 <https://github.com/rust-lang/rust/issues/82523> for more information
+ --> tests/ui/pin_project/safe_packed_borrows.rs:2:9
+  |
+2 | #![deny(safe_packed_borrows)] //~ ERROR has been renamed to `unaligned_references`
+  |         ^^^^^^^^^^^^^^^^^^^
+  |
+note: the lint level is defined here
+ --> tests/ui/pin_project/safe_packed_borrows.rs:1:9
+  |
+1 | #![deny(renamed_and_removed_lints)]
+  |         ^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error[E0793]: reference to packed field is unaligned
+  --> tests/ui/pin_project/safe_packed_borrows.rs:21:13
+   |
+21 |     let _ = &a.f;
+   |             ^^^^
+   |
+   = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+   = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
+
+error[E0793]: reference to packed field is unaligned
+  --> tests/ui/pin_project/safe_packed_borrows.rs:24:13
+   |
+24 |     let _ = &b.f;
+   |             ^^^^
+   |
+   = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+   = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.rs b/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.rs
new file mode 100644
index 0000000000..5c7dc4381e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.rs
@@ -0,0 +1,19 @@
+// Refs: https://github.com/rust-lang/rust/issues/82523
+
+#[repr(packed)]
+struct Packed {
+    f: u32,
+}
+
+#[repr(packed(2))]
+struct PackedN {
+    f: u32,
+}
+
+fn main() {
+    let a = Packed { f: 1 };
+    let _ = &a.f; //~ ERROR reference to packed field is unaligned
+
+    let b = PackedN { f: 1 };
+    let _ = &b.f; //~ ERROR reference to packed field is unaligned
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.stderr b/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.stderr
new file mode 100644
index 0000000000..617f1646c6
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unaligned_references.stderr
@@ -0,0 +1,19 @@
+error[E0793]: reference to packed field is unaligned
+  --> tests/ui/pin_project/unaligned_references.rs:15:13
+   |
+15 |     let _ = &a.f; //~ ERROR reference to packed field is unaligned
+   |             ^^^^
+   |
+   = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+   = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
+
+error[E0793]: reference to packed field is unaligned
+  --> tests/ui/pin_project/unaligned_references.rs:18:13
+   |
+18 |     let _ = &b.f; //~ ERROR reference to packed field is unaligned
+   |             ^^^^
+   |
+   = note: packed structs are only aligned by one byte, and many modern architectures penalize unaligned field accesses
+   = note: creating a misaligned reference is undefined behavior (even if that reference is never dereferenced)
+   = help: copy the field contents to a local variable, or replace the reference with a raw pointer and use `read_unaligned`/`write_unaligned` (loads and stores via `*p` must be properly aligned even when using raw pointers)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.rs b/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.rs
new file mode 100644
index 0000000000..3f5f32be69
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.rs
@@ -0,0 +1,11 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct S {
+    #[pin]
+    f: u8,
+}
+
+impl Unpin for __S {} //~ ERROR E0412,E0321
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.stderr b/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.stderr
new file mode 100644
index 0000000000..82c2aa5b91
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.stderr
@@ -0,0 +1,5 @@
+error[E0412]: cannot find type `__S` in this scope
+ --> tests/ui/pin_project/unpin_sneaky.rs:9:16
+  |
+9 | impl Unpin for __S {} //~ ERROR E0412,E0321
+  |                ^^^ not found in this scope
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/visibility.rs b/third_party/rust/pin-project/tests/ui/pin_project/visibility.rs
new file mode 100644
index 0000000000..fdff5a6783
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/visibility.rs
@@ -0,0 +1,49 @@
+/// Only named projected types can be imported.
+/// See import_unnamed.rs for unnamed projected types.
+
+mod pub_ {
+    use pin_project::pin_project;
+
+    #[pin_project(project = DProj, project_ref = DProjRef)]
+    pub struct Default(());
+
+    #[pin_project(project = RProj, project_ref = RProjRef, project_replace = RProjOwn)]
+    pub struct Replace(());
+}
+pub mod pub_use {
+    #[rustfmt::skip]
+    pub use crate::pub_::DProj; //~ ERROR E0365
+    #[rustfmt::skip]
+    pub use crate::pub_::DProjRef; //~ ERROR E0365
+    #[rustfmt::skip]
+    pub use crate::pub_::RProj; //~ ERROR E0365
+    #[rustfmt::skip]
+    pub use crate::pub_::RProjOwn; //~ ERROR E0365
+    #[rustfmt::skip]
+    pub use crate::pub_::RProjRef; //~ ERROR E0365
+
+    // Confirm that the visibility of the original type is not changed.
+    pub use crate::pub_::{Default, Replace};
+}
+pub mod pub_use2 {
+    // Ok
+    #[allow(unused_imports)]
+    pub(crate) use crate::pub_::{DProj, DProjRef, RProj, RProjOwn, RProjRef};
+}
+
+mod pub_crate {
+    use pin_project::pin_project;
+
+    #[pin_project(project = DProj, project_ref = DProjRef)]
+    pub(crate) struct Default(());
+
+    #[pin_project(project = RProj, project_ref = RProjRef, project_replace = RProjOwn)]
+    pub(crate) struct Replace(());
+}
+pub mod pub_crate_use {
+    // Ok
+    #[allow(unused_imports)]
+    pub(crate) use crate::pub_crate::{DProj, DProjRef, RProj, RProjOwn, RProjRef};
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/visibility.stderr b/third_party/rust/pin-project/tests/ui/pin_project/visibility.stderr
new file mode 100644
index 0000000000..4d1b7229a6
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/visibility.stderr
@@ -0,0 +1,39 @@
+error[E0365]: `DProj` is only public within the crate, and cannot be re-exported outside
+  --> tests/ui/pin_project/visibility.rs:15:13
+   |
+15 |     pub use crate::pub_::DProj; //~ ERROR E0365
+   |             ^^^^^^^^^^^^^^^^^^ re-export of crate public `DProj`
+   |
+   = note: consider declaring type or module `DProj` with `pub`
+
+error[E0365]: `DProjRef` is only public within the crate, and cannot be re-exported outside
+  --> tests/ui/pin_project/visibility.rs:17:13
+   |
+17 |     pub use crate::pub_::DProjRef; //~ ERROR E0365
+   |             ^^^^^^^^^^^^^^^^^^^^^ re-export of crate public `DProjRef`
+   |
+   = note: consider declaring type or module `DProjRef` with `pub`
+
+error[E0365]: `RProj` is only public within the crate, and cannot be re-exported outside
+  --> tests/ui/pin_project/visibility.rs:19:13
+   |
+19 |     pub use crate::pub_::RProj; //~ ERROR E0365
+   |             ^^^^^^^^^^^^^^^^^^ re-export of crate public `RProj`
+   |
+   = note: consider declaring type or module `RProj` with `pub`
+
+error[E0365]: `RProjOwn` is only public within the crate, and cannot be re-exported outside
+  --> tests/ui/pin_project/visibility.rs:21:13
+   |
+21 |     pub use crate::pub_::RProjOwn; //~ ERROR E0365
+   |             ^^^^^^^^^^^^^^^^^^^^^ re-export of crate public `RProjOwn`
+   |
+   = note: consider declaring type or module `RProjOwn` with `pub`
+
+error[E0365]: `RProjRef` is only public within the crate, and cannot be re-exported outside
+  --> tests/ui/pin_project/visibility.rs:23:13
+   |
+23 |     pub use crate::pub_::RProjRef; //~ ERROR E0365
+   |             ^^^^^^^^^^^^^^^^^^^^^ re-export of crate public `RProjRef`
+   |
+   = note: consider declaring type or module `RProjRef` with `pub`
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.rs
new file mode 100644
index 0000000000..9f89942b21
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.rs
@@ -0,0 +1,17 @@
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project(PinnedDrop)]
+struct Struct {
+    f: bool,
+}
+
+#[pinned_drop]
+impl PinnedDrop for Struct {
+    fn drop(mut self: Pin<&mut Self>) {
+        __drop_inner(__self);
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.stderr
new file mode 100644
index 0000000000..277d50f9ba
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/call-drop-inner.stderr
@@ -0,0 +1,15 @@
+error[E0061]: this function takes 0 arguments but 1 argument was supplied
+  --> tests/ui/pinned_drop/call-drop-inner.rs:13:9
+   |
+13 |         __drop_inner(__self);
+   |         ^^^^^^^^^^^^ ------
+   |                      |
+   |                      unexpected argument of type `Pin<&mut Struct>`
+   |                      help: remove the extra argument
+   |
+note: function defined here
+  --> tests/ui/pinned_drop/call-drop-inner.rs:10:1
+   |
+10 | #[pinned_drop]
+   | ^^^^^^^^^^^^^^
+   = note: this error originates in the attribute macro `pinned_drop` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.rs
new file mode 100644
index 0000000000..23d756d4dc
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.rs
@@ -0,0 +1,27 @@
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+// 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(PinnedDrop)] //~ ERROR E0277
+struct PinnedDropImpl<T> {
+    #[pin]
+    f: T,
+}
+
+#[pinned_drop]
+impl<T: Unpin> PinnedDrop for PinnedDropImpl<T> {
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.stderr
new file mode 100644
index 0000000000..837b1db0f2
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/conditional-drop-impl.stderr
@@ -0,0 +1,31 @@
+error[E0367]: `Drop` impl requires `T: Unpin` but the struct it is implemented for does not
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:11:9
+   |
+11 | impl<T: Unpin> Drop for DropImpl<T> {
+   |         ^^^^^
+   |
+note: the implementor must specify the same requirement
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:7:1
+   |
+7  | struct DropImpl<T> {
+   | ^^^^^^^^^^^^^^^^^^
+
+error[E0277]: `T` cannot be unpinned
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:16:15
+   |
+16 | #[pin_project(PinnedDrop)] //~ ERROR E0277
+   |               ^^^^^^^^^^ the trait `Unpin` is not implemented for `T`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required for `PinnedDropImpl<T>` to implement `PinnedDrop`
+  --> tests/ui/pinned_drop/conditional-drop-impl.rs:23:16
+   |
+23 | impl<T: Unpin> PinnedDrop for PinnedDropImpl<T> {
+   |         -----  ^^^^^^^^^^     ^^^^^^^^^^^^^^^^^
+   |         |
+   |         unsatisfied trait bound introduced here
+help: consider restricting type parameter `T`
+   |
+17 | struct PinnedDropImpl<T: std::marker::Unpin> {
+   |                        ++++++++++++++++++++
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.rs
new file mode 100644
index 0000000000..e31f46f262
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.rs
@@ -0,0 +1,9 @@
+use pin_project::pin_project;
+
+#[pin_project(PinnedDrop)] //~ ERROR E0277
+struct Struct {
+    #[pin]
+    f: u8,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.stderr
new file mode 100644
index 0000000000..ef8a7bf4b4
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.stderr
@@ -0,0 +1,5 @@
+error[E0277]: the trait bound `Struct: PinnedDrop` is not satisfied
+ --> tests/ui/pinned_drop/forget-pinned-drop-impl.rs:3:15
+  |
+3 | #[pin_project(PinnedDrop)] //~ ERROR E0277
+  |               ^^^^^^^^^^ the trait `PinnedDrop` is not implemented for `Struct`
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.rs
new file mode 100644
index 0000000000..783167fc0d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.rs
@@ -0,0 +1,14 @@
+// by-ref binding `ref (mut) self` and sub-patterns `@` are not allowed in receivers (rejected by rustc).
+
+use std::pin::Pin;
+
+struct S {}
+
+impl S {
+    fn take_ref_self(ref self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+    fn take_ref_mut_self(ref mut self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+
+    fn self_subpat(self @ S {}: Self) {} //~ ERROR expected one of `)`, `,`, or `:`, found `@`
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.stderr
new file mode 100644
index 0000000000..464be5e5b5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid-self.stderr
@@ -0,0 +1,25 @@
+error: expected identifier, found keyword `self`
+ --> tests/ui/pinned_drop/invalid-self.rs:8:26
+  |
+8 |     fn take_ref_self(ref self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+  |                          ^^^^ expected identifier, found keyword
+
+error: expected identifier, found keyword `self`
+ --> tests/ui/pinned_drop/invalid-self.rs:9:34
+  |
+9 |     fn take_ref_mut_self(ref mut self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+  |                                  ^^^^ expected identifier, found keyword
+
+error: expected parameter name, found `@`
+  --> tests/ui/pinned_drop/invalid-self.rs:11:25
+   |
+11 |     fn self_subpat(self @ S {}: Self) {} //~ ERROR expected one of `)`, `,`, or `:`, found `@`
+   |                         ^ expected parameter name
+
+error: expected one of `)`, `,`, or `:`, found `@`
+  --> tests/ui/pinned_drop/invalid-self.rs:11:25
+   |
+11 |     fn self_subpat(self @ S {}: Self) {} //~ ERROR expected one of `)`, `,`, or `:`, found `@`
+   |                        -^ expected one of `)`, `,`, or `:`
+   |                        |
+   |                        help: missing `,`
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.rs
new file mode 100644
index 0000000000..b2c25265d0
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.rs
@@ -0,0 +1,231 @@
+mod argument {
+    use std::pin::Pin;
+
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct UnexpectedArg1(());
+
+    #[pinned_drop(foo)] //~ ERROR unexpected argument
+    impl PinnedDrop for UnexpectedArg1 {
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct UnexpectedArg2(());
+
+    #[pinned_drop()] // Ok
+    impl PinnedDrop for UnexpectedArg2 {
+        fn drop(self: Pin<&mut Self>) {}
+    }
+}
+
+mod attribute {
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct Duplicate(());
+
+    #[pinned_drop]
+    #[pinned_drop] //~ ERROR duplicate #[pinned_drop] attribute
+    impl PinnedDrop for Duplicate {
+        fn drop(self: Pin<&mut Self>) {}
+    }
+}
+
+mod item {
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct TraitImpl(());
+
+    #[pinned_drop]
+    impl Drop for TraitImpl {} //~ ERROR may only be used on implementation for the `PinnedDrop` trait
+
+    #[pin_project(PinnedDrop)]
+    struct InherentImpl(());
+
+    #[pinned_drop]
+    impl InherentImpl {} //~ ERROR may only be used on implementation for the `PinnedDrop` trait
+
+    #[pinned_drop]
+    fn func(_: Pin<&mut ()>) {} //~ ERROR expected `impl`
+}
+
+mod unsafety {
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct Impl(());
+
+    #[pinned_drop]
+    unsafe impl PinnedDrop for Impl {
+        //~^ ERROR implementing the trait `PinnedDrop` is not unsafe
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct Method(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Method {
+        unsafe fn drop(self: Pin<&mut Self>) {} //~ ERROR implementing the method `drop` is not unsafe
+    }
+}
+
+mod assoc_item {
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct Empty(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Empty {} //~ ERROR not all trait items implemented, missing: `drop`
+
+    #[pin_project(PinnedDrop)]
+    struct Const1(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Const1 {
+        const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct Const2(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Const2 {
+        fn drop(self: Pin<&mut Self>) {}
+        const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct Type1(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Type1 {
+        type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct Type2(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Type2 {
+        fn drop(self: Pin<&mut Self>) {}
+        type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct Duplicate(());
+
+    #[pinned_drop]
+    impl PinnedDrop for Duplicate {
+        fn drop(self: Pin<&mut Self>) {}
+        fn drop(self: Pin<&mut Self>) {} //~ ERROR duplicate definitions with name `drop`
+    }
+}
+
+mod method {
+    use std::pin::Pin;
+
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    struct RetUnit(());
+
+    #[pinned_drop]
+    impl PinnedDrop for RetUnit {
+        fn drop(self: Pin<&mut Self>) -> () {} // Ok
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct RetTy(());
+
+    #[pinned_drop]
+    impl PinnedDrop for RetTy {
+        fn drop(self: Pin<&mut Self>) -> Self {} //~ ERROR method `drop` must return the unit type
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct NoArg(());
+
+    #[pinned_drop]
+    impl PinnedDrop for NoArg {
+        fn drop() {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct MultiArg(());
+
+    #[pinned_drop]
+    impl PinnedDrop for MultiArg {
+        fn drop(self: Pin<&mut Self>, _: ()) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct InvalidArg1(());
+
+    #[pinned_drop]
+    impl PinnedDrop for InvalidArg1 {
+        fn drop(&mut self) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct InvalidArg2(());
+
+    #[pinned_drop]
+    impl PinnedDrop for InvalidArg2 {
+        fn drop(_: Pin<&mut Self>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct InvalidArg3(());
+
+    #[pinned_drop]
+    impl PinnedDrop for InvalidArg3 {
+        fn drop(self: Pin<&Self>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct InvalidArg4(());
+
+    #[pinned_drop]
+    impl PinnedDrop for InvalidArg4 {
+        fn drop(self: Pin<&mut ()>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    }
+
+    #[pin_project(PinnedDrop)]
+    struct InvalidName(());
+
+    #[pinned_drop]
+    impl PinnedDrop for InvalidName {
+        fn pinned_drop(self: Pin<&mut Self>) {} //~ ERROR method `pinned_drop` is not a member of trait `PinnedDrop
+    }
+}
+
+mod self_ty {
+    use pin_project::pinned_drop;
+
+    #[pinned_drop]
+    impl PinnedDrop for () {
+        //~^ ERROR implementing the trait `PinnedDrop` on this type is unsupported
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for &mut A {
+        //~^ ERROR implementing the trait `PinnedDrop` on this type is unsupported
+        fn drop(self: Pin<&mut Self>) {}
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for [A] {
+        //~^ ERROR implementing the trait `PinnedDrop` on this type is unsupported
+        fn drop(self: Pin<&mut Self>) {}
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.stderr
new file mode 100644
index 0000000000..264def08f5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.stderr
@@ -0,0 +1,143 @@
+error: unexpected argument: `foo`
+ --> tests/ui/pinned_drop/invalid.rs:9:19
+  |
+9 |     #[pinned_drop(foo)] //~ ERROR unexpected argument
+  |                   ^^^
+
+error: duplicate #[pinned_drop] attribute
+  --> tests/ui/pinned_drop/invalid.rs:30:5
+   |
+30 |     #[pinned_drop] //~ ERROR duplicate #[pinned_drop] attribute
+   |     ^^^^^^^^^^^^^^
+
+error: #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+  --> tests/ui/pinned_drop/invalid.rs:43:10
+   |
+43 |     impl Drop for TraitImpl {} //~ ERROR may only be used on implementation for the `PinnedDrop` trait
+   |          ^^^^
+
+error: #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+  --> tests/ui/pinned_drop/invalid.rs:49:10
+   |
+49 |     impl InherentImpl {} //~ ERROR may only be used on implementation for the `PinnedDrop` trait
+   |          ^^^^^^^^^^^^
+
+error: expected `impl`
+  --> tests/ui/pinned_drop/invalid.rs:52:5
+   |
+52 |     fn func(_: Pin<&mut ()>) {} //~ ERROR expected `impl`
+   |     ^^
+
+error: implementing the trait `PinnedDrop` is not unsafe
+  --> tests/ui/pinned_drop/invalid.rs:62:5
+   |
+62 |     unsafe impl PinnedDrop for Impl {
+   |     ^^^^^^
+
+error: implementing the method `drop` is not unsafe
+  --> tests/ui/pinned_drop/invalid.rs:72:9
+   |
+72 |         unsafe fn drop(self: Pin<&mut Self>) {} //~ ERROR implementing the method `drop` is not unsafe
+   |         ^^^^^^
+
+error: not all trait items implemented, missing: `drop`
+  --> tests/ui/pinned_drop/invalid.rs:83:5
+   |
+83 |     impl PinnedDrop for Empty {} //~ ERROR not all trait items implemented, missing: `drop`
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: const `A` is not a member of trait `PinnedDrop`
+  --> tests/ui/pinned_drop/invalid.rs:90:9
+   |
+90 |         const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+   |         ^^^^^^^^^^^^^^^^
+
+error: const `A` is not a member of trait `PinnedDrop`
+   --> tests/ui/pinned_drop/invalid.rs:100:9
+    |
+100 |         const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+    |         ^^^^^^^^^^^^^^^^
+
+error: type `A` is not a member of trait `PinnedDrop`
+   --> tests/ui/pinned_drop/invalid.rs:108:9
+    |
+108 |         type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    |         ^^^^^^^^^^^^
+
+error: type `A` is not a member of trait `PinnedDrop`
+   --> tests/ui/pinned_drop/invalid.rs:118:9
+    |
+118 |         type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    |         ^^^^^^^^^^^^
+
+error: duplicate definitions with name `drop`
+   --> tests/ui/pinned_drop/invalid.rs:127:9
+    |
+127 |         fn drop(self: Pin<&mut Self>) {} //~ ERROR duplicate definitions with name `drop`
+    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: method `drop` must return the unit type
+   --> tests/ui/pinned_drop/invalid.rs:149:42
+    |
+149 |         fn drop(self: Pin<&mut Self>) -> Self {} //~ ERROR method `drop` must return the unit type
+    |                                          ^^^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:157:16
+    |
+157 |         fn drop() {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                ^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:165:17
+    |
+165 |         fn drop(self: Pin<&mut Self>, _: ()) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:173:17
+    |
+173 |         fn drop(&mut self) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                 ^^^^^^^^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:181:17
+    |
+181 |         fn drop(_: Pin<&mut Self>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                 ^^^^^^^^^^^^^^^^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:189:17
+    |
+189 |         fn drop(self: Pin<&Self>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                 ^^^^^^^^^^^^^^^^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+   --> tests/ui/pinned_drop/invalid.rs:197:17
+    |
+197 |         fn drop(self: Pin<&mut ()>) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+    |                 ^^^^^^^^^^^^^^^^^^
+
+error: method `pinned_drop` is not a member of trait `PinnedDrop
+   --> tests/ui/pinned_drop/invalid.rs:205:12
+    |
+205 |         fn pinned_drop(self: Pin<&mut Self>) {} //~ ERROR method `pinned_drop` is not a member of trait `PinnedDrop
+    |            ^^^^^^^^^^^
+
+error: implementing the trait `PinnedDrop` on this type is unsupported
+   --> tests/ui/pinned_drop/invalid.rs:213:25
+    |
+213 |     impl PinnedDrop for () {
+    |                         ^^
+
+error: implementing the trait `PinnedDrop` on this type is unsupported
+   --> tests/ui/pinned_drop/invalid.rs:219:25
+    |
+219 |     impl PinnedDrop for &mut A {
+    |                         ^^^^^^
+
+error: implementing the trait `PinnedDrop` on this type is unsupported
+   --> tests/ui/pinned_drop/invalid.rs:225:25
+    |
+225 |     impl PinnedDrop for [A] {
+    |                         ^^^
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.rs
new file mode 100644
index 0000000000..391f2901ed
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.rs
@@ -0,0 +1,17 @@
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project]
+struct S {
+    #[pin]
+    f: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for S {
+    //~^ ERROR E0119
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.stderr
new file mode 100644
index 0000000000..a07ba99e96
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.stderr
@@ -0,0 +1,8 @@
+error[E0119]: conflicting implementations of trait `PinnedDrop` for type `S`
+  --> tests/ui/pinned_drop/pinned-drop-no-attr-arg.rs:12:1
+   |
+5  | #[pin_project]
+   | -------------- first implementation here
+...
+12 | impl PinnedDrop for S {
+   | ^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `S`
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/self.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/self.rs
new file mode 100644
index 0000000000..ff634022e5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/self.rs
@@ -0,0 +1,58 @@
+pub mod self_in_macro_def {
+    use std::pin::Pin;
+
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    pub struct S {
+        f: (),
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for S {
+        fn drop(self: Pin<&mut Self>) {
+            macro_rules! t {
+                () => {{
+                    let _ = self; //~ ERROR E0434
+
+                    fn f(self: ()) {} //~ ERROR `self` parameter is only allowed in associated functions
+                }};
+            }
+            t!();
+        }
+    }
+}
+
+pub mod self_span {
+    use std::pin::Pin;
+
+    use pin_project::{pin_project, pinned_drop};
+
+    #[pin_project(PinnedDrop)]
+    pub struct S {
+        f: (),
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for S {
+        fn drop(self: Pin<&mut Self>) {
+            let _: () = self; //~ ERROR E0308
+            let _: Self = Self; //~ ERROR E0423
+        }
+    }
+
+    #[pin_project(PinnedDrop)]
+    pub enum E {
+        V { f: () },
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for E {
+        fn drop(self: Pin<&mut Self>) {
+            let _: () = self; //~ ERROR E0308
+            let _: Self = Self::V; //~ ERROR E0533
+        }
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/self.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/self.stderr
new file mode 100644
index 0000000000..ad506a54fd
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/self.stderr
@@ -0,0 +1,62 @@
+error: `self` parameter is only allowed in associated functions
+  --> tests/ui/pinned_drop/self.rs:18:26
+   |
+18 |                     fn f(self: ()) {} //~ ERROR `self` parameter is only allowed in associated functions
+   |                          ^^^^ not semantically valid as function parameter
+...
+21 |             t!();
+   |             ---- in this macro invocation
+   |
+   = note: associated functions are those in `impl` or `trait` definitions
+   = note: this error originates in the macro `t` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0434]: can't capture dynamic environment in a fn item
+  --> tests/ui/pinned_drop/self.rs:16:29
+   |
+16 |                     let _ = self; //~ ERROR E0434
+   |                             ^^^^
+...
+21 |             t!();
+   |             ---- in this macro invocation
+   |
+   = help: use the `|| { ... }` closure form instead
+   = note: this error originates in the macro `t` (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0423]: expected value, found struct `S`
+  --> tests/ui/pinned_drop/self.rs:40:27
+   |
+32 | /     pub struct S {
+33 | |         f: (),
+34 | |     }
+   | |_____- `S` defined here
+...
+40 |               let _: Self = Self; //~ ERROR E0423
+   |                             ^^^^ help: use struct literal syntax instead: `S { f: val }`
+
+error[E0308]: mismatched types
+  --> tests/ui/pinned_drop/self.rs:39:25
+   |
+39 |             let _: () = self; //~ ERROR E0308
+   |                    --   ^^^^ expected `()`, found `Pin<&mut S>`
+   |                    |
+   |                    expected due to this
+   |
+   = note: expected unit type `()`
+                 found struct `Pin<&mut self_span::S>`
+
+error[E0308]: mismatched types
+  --> tests/ui/pinned_drop/self.rs:52:25
+   |
+52 |             let _: () = self; //~ ERROR E0308
+   |                    --   ^^^^ expected `()`, found `Pin<&mut E>`
+   |                    |
+   |                    expected due to this
+   |
+   = note: expected unit type `()`
+                 found struct `Pin<&mut E>`
+
+error[E0533]: expected value, found struct variant `E::V`
+  --> tests/ui/pinned_drop/self.rs:53:27
+   |
+53 |             let _: Self = Self::V; //~ ERROR E0533
+   |                           ^^^^^^^ not a value
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.rs
new file mode 100644
index 0000000000..3ee2b56c37
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.rs
@@ -0,0 +1,18 @@
+use std::pin::Pin;
+
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project(PinnedDrop)]
+struct S {
+    #[pin]
+    f: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for S {
+    fn drop(self: Pin<&mut Self>) {
+        self.project().f.get_unchecked_mut(); //~ ERROR call to unsafe function is unsafe and requires unsafe function or block [E0133]
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.stderr
new file mode 100644
index 0000000000..911a58ef74
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-call.stderr
@@ -0,0 +1,10 @@
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> tests/ui/pinned_drop/unsafe-call.rs:14:9
+   |
+11 | #[pinned_drop]
+   | -------------- items do not inherit unsafety from separate enclosing items
+...
+14 |         self.project().f.get_unchecked_mut(); //~ ERROR call to unsafe function is unsafe and requires unsafe function or block [E0133]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ call to unsafe function
+   |
+   = note: consult the function's documentation for information on how to avoid undefined behavior
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.rs b/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.rs
new file mode 100644
index 0000000000..ac9d1f8682
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.rs
@@ -0,0 +1,30 @@
+use pin_project::pin_project;
+
+#[pin_project(UnsafeUnpin)] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T, U> Unpin for Foo<T, U> where T: Unpin {}
+
+#[pin_project(UnsafeUnpin)] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T, U> Unpin for Bar<T, U> {}
+
+#[pin_project(UnsafeUnpin)] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    f1: T,
+    f2: U,
+}
+
+impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.stderr b/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.stderr
new file mode 100644
index 0000000000..cdf0d507af
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/conflict-unpin.stderr
@@ -0,0 +1,32 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Foo<_, _>`
+  --> tests/ui/unsafe_unpin/conflict-unpin.rs:3:15
+   |
+3  | #[pin_project(UnsafeUnpin)] //~ ERROR E0119
+   |               ^^^^^^^^^^^ conflicting implementation for `Foo<_, _>`
+...
+10 | impl<T, U> Unpin for Foo<T, U> where T: Unpin {}
+   | ------------------------------ first implementation here
+   |
+   = note: upstream crates may add a new impl of trait `_::_pin_project::UnsafeUnpin` for type `_::_pin_project::__private::Wrapper<'_, Foo<_, _>>` in future versions
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Bar<_, _>`
+  --> tests/ui/unsafe_unpin/conflict-unpin.rs:12:15
+   |
+12 | #[pin_project(UnsafeUnpin)] //~ ERROR E0119
+   |               ^^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+19 | impl<T, U> Unpin for Bar<T, U> {}
+   | ------------------------------ first implementation here
+   |
+   = note: upstream crates may add a new impl of trait `_::_pin_project::UnsafeUnpin` for type `_::_pin_project::__private::Wrapper<'_, Bar<_, _>>` in future versions
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Baz<_, _>`
+  --> tests/ui/unsafe_unpin/conflict-unpin.rs:21:15
+   |
+21 | #[pin_project(UnsafeUnpin)] //~ ERROR E0119
+   |               ^^^^^^^^^^^ conflicting implementation for `Baz<_, _>`
+...
+28 | impl<T: Unpin, U: Unpin> Unpin for Baz<T, U> {}
+   | -------------------------------------------- first implementation here
+   |
+   = note: upstream crates may add a new impl of trait `_::_pin_project::UnsafeUnpin` for type `_::_pin_project::__private::Wrapper<'_, Baz<_, _>>` in future versions
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/README.md b/third_party/rust/pin-project/tests/ui/unstable-features/README.md
new file mode 100644
index 0000000000..96f370ca77
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/README.md
@@ -0,0 +1,7 @@
+# UI tests for unstable features
+
+These tests check how the guarantees and features provided by pin-project
+interact with unstable language features.
+
+The names of the files contained in this directory need to begin with the name
+of the feature.
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.rs b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.rs
new file mode 100644
index 0000000000..542250bd90
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.rs
@@ -0,0 +1,20 @@
+// Note: If you change this test, change 'marker_trait_attr.rs' at the same time.
+
+use std::marker::PhantomPinned;
+
+use pin_project::pin_project;
+
+#[pin_project] //~ ERROR E0119
+struct Struct<T> {
+    #[pin]
+    f: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Struct<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Struct<PhantomPinned>>()
+}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.stderr
new file mode 100644
index 0000000000..fcb9185328
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.stderr
@@ -0,0 +1,10 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Struct<_>`
+  --> tests/ui/unstable-features/marker_trait_attr-feature-gate.rs:7:1
+   |
+7  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+14 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.rs b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.rs
new file mode 100644
index 0000000000..9c8e6643e0
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.rs
@@ -0,0 +1,26 @@
+// Note: If you change this test, change 'marker_trait_attr-feature-gate.rs' at the same time.
+
+// marker_trait_attr
+// Tracking issue: https://github.com/rust-lang/rust/issues/29864
+#![feature(marker_trait_attr)]
+
+// See https://github.com/taiki-e/pin-project/issues/105#issuecomment-535355974
+
+use std::marker::PhantomPinned;
+
+use pin_project::pin_project;
+
+#[pin_project] //~ ERROR E0119
+struct Struct<T> {
+    #[pin]
+    f: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Struct<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Struct<PhantomPinned>>()
+}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.stderr
new file mode 100644
index 0000000000..85949d5c41
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.stderr
@@ -0,0 +1,10 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Struct<_>`
+  --> tests/ui/unstable-features/marker_trait_attr.rs:13:1
+   |
+13 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+20 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.rs b/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.rs
new file mode 100644
index 0000000000..96056423a0
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.rs
@@ -0,0 +1,23 @@
+#![feature(negative_impls)]
+#![deny(suspicious_auto_trait_impls)]
+
+// https://rust-lang.zulipchat.com/#narrow/stream/213817-t-lang/topic/design.20meeting.3A.20backlog.20bonanza/near/269471299
+// https://github.com/taiki-e/pin-project/issues/340
+
+#[pin_project::pin_project]
+struct Foo<Pinned, Unpinned> {
+    #[pin]
+    pinned: Pinned,
+
+    unpinned: Unpinned,
+}
+
+struct MyPhantomPinned {}
+impl !Unpin for MyPhantomPinned {}
+impl Unpin for Foo<MyPhantomPinned, ()> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<MyPhantomPinned, ()>>()
+}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.stderr
new file mode 100644
index 0000000000..145716dd09
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/negative_impls.stderr
@@ -0,0 +1,19 @@
+error: cross-crate traits with a default impl, like `Unpin`, should not be specialized
+  --> tests/ui/unstable-features/negative_impls.rs:17:1
+   |
+17 | impl Unpin for Foo<MyPhantomPinned, ()> {}
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = warning: this will change its meaning in a future release!
+   = note: for more information, see issue #93367 <https://github.com/rust-lang/rust/issues/93367>
+   = note: `MyPhantomPinned` is not a generic parameter
+note: try using the same sequence of generic parameters as the struct definition
+  --> tests/ui/unstable-features/negative_impls.rs:8:1
+   |
+8  | struct Foo<Pinned, Unpinned> {
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+note: the lint level is defined here
+  --> tests/ui/unstable-features/negative_impls.rs:2:9
+   |
+2  | #![deny(suspicious_auto_trait_impls)]
+   |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.rs b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.rs
new file mode 100644
index 0000000000..012c8709bd
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.rs
@@ -0,0 +1,20 @@
+// Note: If you change this test, change 'overlapping_marker_traits.rs' at the same time.
+
+use std::marker::PhantomPinned;
+
+use pin_project::pin_project;
+
+#[pin_project] //~ ERROR E0119
+struct Struct<T> {
+    #[pin]
+    f: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Struct<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Struct<PhantomPinned>>()
+}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.stderr
new file mode 100644
index 0000000000..0783be047c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.stderr
@@ -0,0 +1,10 @@
+error[E0119]: conflicting implementations of trait `Unpin` for type `Struct<_>`
+  --> tests/ui/unstable-features/overlapping_marker_traits-feature-gate.rs:7:1
+   |
+7  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+14 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.rs b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.rs
new file mode 100644
index 0000000000..8dc27c1dba
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.rs
@@ -0,0 +1,30 @@
+// Note: If you change this test, change 'overlapping_marker_traits-feature-gate.rs' at the same time.
+
+// This feature could break the guarantee for Unpin provided by pin-project,
+// but was removed in https://github.com/rust-lang/rust/pull/68544 (nightly-2020-02-06).
+// Refs:
+// - https://github.com/rust-lang/rust/issues/29864#issuecomment-515780867
+// - https://github.com/taiki-e/pin-project/issues/105
+
+// overlapping_marker_traits
+// Tracking issue: https://github.com/rust-lang/rust/issues/29864
+#![feature(overlapping_marker_traits)]
+
+use std::marker::PhantomPinned;
+
+use pin_project::pin_project;
+
+#[pin_project]
+struct Struct<T> {
+    #[pin]
+    f: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Struct<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Struct<PhantomPinned>>()
+}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.stderr
new file mode 100644
index 0000000000..1c8e7e7040
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.stderr
@@ -0,0 +1,18 @@
+error[E0557]: feature has been removed
+  --> tests/ui/unstable-features/overlapping_marker_traits.rs:11:12
+   |
+11 | #![feature(overlapping_marker_traits)]
+   |            ^^^^^^^^^^^^^^^^^^^^^^^^^ feature has been removed
+   |
+   = note: removed in favor of `#![feature(marker_trait_attr)]`
+
+error[E0119]: conflicting implementations of trait `Unpin` for type `Struct<_>`
+  --> tests/ui/unstable-features/overlapping_marker_traits.rs:17:1
+   |
+17 | #[pin_project]
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+24 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in the derive macro `::pin_project::__private::__PinProjectInternalDerive` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.rs b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.rs
new file mode 100644
index 0000000000..f8467b082e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.rs
@@ -0,0 +1,53 @@
+// Note: If you change this test, change 'trivial_bounds.rs' at the same time.
+
+mod phantom_pinned {
+    use std::marker::{PhantomData, PhantomPinned};
+
+    struct A(PhantomPinned);
+
+    impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR E0277
+
+    struct Wrapper<T>(T);
+
+    impl<T> Unpin for Wrapper<T> where T: Unpin {}
+
+    struct B(PhantomPinned);
+
+    impl Unpin for B where Wrapper<PhantomPinned>: Unpin {} //~ ERROR E0277
+
+    struct WrapperWithLifetime<'a, T>(PhantomData<&'a ()>, T);
+
+    impl<T> Unpin for WrapperWithLifetime<'_, T> where T: Unpin {}
+
+    struct C(PhantomPinned);
+
+    impl<'a> Unpin for C where WrapperWithLifetime<'a, PhantomPinned>: Unpin {} // Ok
+}
+
+mod inner {
+    use std::marker::{PhantomData, PhantomPinned};
+
+    struct Inner(PhantomPinned);
+
+    struct A(Inner);
+
+    impl Unpin for A where Inner: Unpin {} //~ ERROR E0277
+
+    struct Wrapper<T>(T);
+
+    impl<T> Unpin for Wrapper<T> where T: Unpin {}
+
+    struct B(Inner);
+
+    impl Unpin for B where Wrapper<Inner>: Unpin {} //~ ERROR E0277
+
+    struct WrapperWithLifetime<'a, T>(PhantomData<&'a ()>, T);
+
+    impl<T> Unpin for WrapperWithLifetime<'_, T> where T: Unpin {}
+
+    struct C(Inner);
+
+    impl<'a> Unpin for C where WrapperWithLifetime<'a, Inner>: Unpin {} // Ok
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.stderr
new file mode 100644
index 0000000000..ccf1ae8d94
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.stderr
@@ -0,0 +1,63 @@
+error[E0277]: `PhantomPinned` cannot be unpinned
+ --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:8:28
+  |
+8 |     impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR E0277
+  |                            ^^^^^^^^^^^^^^^^^^^^ the trait `Unpin` is not implemented for `PhantomPinned`
+  |
+  = note: consider using the `pin!` macro
+          consider using `Box::pin` if you need to access the pinned value outside of the current scope
+  = help: see issue #48214
+  = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:16:28
+   |
+16 |     impl Unpin for B where Wrapper<PhantomPinned>: Unpin {} //~ ERROR E0277
+   |                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required for `phantom_pinned::Wrapper<PhantomPinned>` to implement `Unpin`
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:12:13
+   |
+12 |     impl<T> Unpin for Wrapper<T> where T: Unpin {}
+   |             ^^^^^     ^^^^^^^^^^          ----- unsatisfied trait bound introduced here
+   = help: see issue #48214
+   = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:34:28
+   |
+34 |     impl Unpin for A where Inner: Unpin {} //~ ERROR E0277
+   |                            ^^^^^^^^^^^^ within `Inner`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `Inner`
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:30:12
+   |
+30 |     struct Inner(PhantomPinned);
+   |            ^^^^^
+   = help: see issue #48214
+   = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `PhantomPinned` cannot be unpinned
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:42:28
+   |
+42 |     impl Unpin for B where Wrapper<Inner>: Unpin {} //~ ERROR E0277
+   |                            ^^^^^^^^^^^^^^^^^^^^^ within `Inner`, the trait `Unpin` is not implemented for `PhantomPinned`
+   |
+   = note: consider using the `pin!` macro
+           consider using `Box::pin` if you need to access the pinned value outside of the current scope
+note: required because it appears within the type `Inner`
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:30:12
+   |
+30 |     struct Inner(PhantomPinned);
+   |            ^^^^^
+note: required for `inner::Wrapper<Inner>` to implement `Unpin`
+  --> tests/ui/unstable-features/trivial_bounds-feature-gate.rs:38:13
+   |
+38 |     impl<T> Unpin for Wrapper<T> where T: Unpin {}
+   |             ^^^^^     ^^^^^^^^^^          ----- unsatisfied trait bound introduced here
+   = help: see issue #48214
+   = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.rs b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.rs
new file mode 100644
index 0000000000..d98ef60e6d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.rs
@@ -0,0 +1,39 @@
+// Note: If you change this test, change 'trivial_bounds-feature-gate.rs' at the same time.
+
+// trivial_bounds
+// Tracking issue: https://github.com/rust-lang/rust/issues/48214
+#![feature(trivial_bounds)]
+#![deny(trivial_bounds)]
+#![allow(dead_code)]
+
+use std::marker::{PhantomData, PhantomPinned};
+
+fn inner() {
+    struct Inner(PhantomPinned);
+
+    struct A(PhantomPinned);
+
+    impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+
+    struct B(Inner);
+
+    impl Unpin for B where Inner: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+
+    struct Wrapper<T>(T);
+
+    impl<T> Unpin for Wrapper<T> where T: Unpin {}
+
+    struct C(Inner);
+
+    impl Unpin for C where Wrapper<Inner>: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+
+    struct WrapperWithLifetime<'a, T>(PhantomData<&'a ()>, T);
+
+    impl<T> Unpin for WrapperWithLifetime<'_, T> where T: Unpin {}
+
+    struct D(Inner);
+
+    impl<'a> Unpin for D where WrapperWithLifetime<'a, Inner>: Unpin {} // Ok
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.stderr
new file mode 100644
index 0000000000..ab07a102ec
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.stderr
@@ -0,0 +1,23 @@
+error: trait bound PhantomPinned: Unpin does not depend on any type or lifetime parameters
+  --> tests/ui/unstable-features/trivial_bounds.rs:16:43
+   |
+16 |     impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+   |                                           ^^^^^
+   |
+note: the lint level is defined here
+  --> tests/ui/unstable-features/trivial_bounds.rs:6:9
+   |
+6  | #![deny(trivial_bounds)]
+   |         ^^^^^^^^^^^^^^
+
+error: trait bound Inner: Unpin does not depend on any type or lifetime parameters
+  --> tests/ui/unstable-features/trivial_bounds.rs:20:35
+   |
+20 |     impl Unpin for B where Inner: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+   |                                   ^^^^^
+
+error: trait bound Wrapper<Inner>: Unpin does not depend on any type or lifetime parameters
+  --> tests/ui/unstable-features/trivial_bounds.rs:28:44
+   |
+28 |     impl Unpin for C where Wrapper<Inner>: Unpin {} //~ ERROR Unpin does not depend on any type or lifetime parameters
+   |                                            ^^^^^