Adding upstream version 86.0.1.upstream/86.0.1upstream

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

94 files changed, 2469 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..e16f3e8de2
--- /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> {
+    inner: T,
+}
+
+fn main() {
+    let mut x = Foo { inner: 0_u8 };
+    let _x = 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..45af3ae05a
--- /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 `std::pin::Pin<&mut Foo<u8>>` in the current scope
+  --> $DIR/cfg_attr-resolve.rs:10:31
+   |
+10 |     let _x = Pin::new(&mut x).project(); //~ ERROR E0599
+   |                               ^^^^^^^ method not found in `std::pin::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..2807c8768b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.rs
@@ -0,0 +1,24 @@
+use pin_project::pin_project;
+use std::pin::Pin;
+
+#[cfg_attr(not(any()), pin_project)]
+struct Foo<T> {
+    #[cfg_attr(any(), pin)]
+    inner: T,
+}
+
+#[cfg_attr(not(any()), pin_project)]
+struct Bar<T> {
+    #[cfg_attr(not(any()), pin)]
+    inner: T,
+}
+
+fn main() {
+    let mut x = Foo { inner: 0_u8 };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut u8> = x.inner; //~ ERROR E0308
+
+    let mut x = Bar { inner: 0_u8 };
+    let x = Pin::new(&mut x).project();
+    let _: &mut u8 = x.inner; //~ 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..286829911f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-type-mismatch.stderr
@@ -0,0 +1,23 @@
+error[E0308]: mismatched types
+  --> $DIR/cfg_attr-type-mismatch.rs:19:27
+   |
+19 |     let _: Pin<&mut u8> = x.inner; //~ ERROR E0308
+   |            ------------   ^^^^^^^ expected struct `std::pin::Pin`, found `&mut u8`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `std::pin::Pin<&mut u8>`
+           found mutable reference `&mut u8`
+
+error[E0308]: mismatched types
+  --> $DIR/cfg_attr-type-mismatch.rs:23:22
+   |
+23 |     let _: &mut u8 = x.inner; //~ ERROR E0308
+   |            -------   ^^^^^^^
+   |            |         |
+   |            |         expected `&mut u8`, found struct `std::pin::Pin`
+   |            |         help: consider mutably borrowing here: `&mut x.inner`
+   |            expected due to this
+   |
+   = note: expected mutable reference `&mut u8`
+                         found struct `std::pin::Pin<&mut u8>`
diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.rs b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.rs
new file mode 100644
index 0000000000..7b88205542
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.rs
@@ -0,0 +1,21 @@
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[cfg_attr(any(), pin_project)]
+struct Foo<T> {
+    inner: T,
+}
+
+#[cfg_attr(not(any()), pin_project)]
+struct Bar<T> {
+    #[cfg_attr(not(any()), pin)]
+    inner: T,
+}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<PhantomPinned>>(); // ERROR E0277
+    is_unpin::<Bar<()>>(); // Ok
+    is_unpin::<Bar<PhantomPinned>>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.stderr b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.stderr
new file mode 100644
index 0000000000..8879d020e8
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/cfg_attr-unpin.stderr
@@ -0,0 +1,22 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/cfg_attr-unpin.rs:18:5
+   |
+15 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+18 |     is_unpin::<Foo<PhantomPinned>>(); // ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `Foo<std::marker::PhantomPinned>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Foo<std::marker::PhantomPinned>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/cfg_attr-unpin.rs:20:5
+   |
+15 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+20 |     is_unpin::<Bar<PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `__Bar<'_, std::marker::PhantomPinned>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__Bar<'_, std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Bar<std::marker::PhantomPinned>`
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..3776dac3df
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.rs
@@ -0,0 +1,18 @@
+use auxiliary_macros::hidden_repr;
+use pin_project::pin_project;
+
+//~ ERROR may not be used on #[repr(packed)] types
+// span is lost.
+// Refs: https://github.com/rust-lang/rust/issues/43081
+#[pin_project]
+#[hidden_repr(packed)]
+struct Foo {
+    #[cfg(not(any()))]
+    #[pin]
+    field: u32,
+    #[cfg(any())]
+    #[pin]
+    field: 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..f4d7dee6b7
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-1.stderr
@@ -0,0 +1 @@
+error: #[pin_project] attribute 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..aa65d33149
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.rs
@@ -0,0 +1,18 @@
+use auxiliary_macros::hidden_repr;
+use pin_project::pin_project;
+
+//~ ERROR may not be used on #[repr(packed)] types
+// span is lost.
+// Refs: https://github.com/rust-lang/rust/issues/43081
+#[pin_project]
+#[hidden_repr(packed)]
+struct Foo {
+    #[cfg(any())]
+    #[pin]
+    field: u32,
+    #[cfg(not(any()))]
+    #[pin]
+    field: 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..f4d7dee6b7
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky-span-issue-2.stderr
@@ -0,0 +1 @@
+error: #[pin_project] attribute 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..3305ed39c5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.rs
@@ -0,0 +1,12 @@
+use auxiliary_macros::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 Foo {
+    #[pin]
+    field: 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..5910cf4b64
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/packed_sneaky.stderr
@@ -0,0 +1,7 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> $DIR/packed_sneaky.rs:6:1
+  |
+6 | #[hidden_repr_cfg_not_any(packed)] //~ ERROR may not be used on #[repr(packed)] types
+  | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.rs b/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.rs
new file mode 100644
index 0000000000..b7bb04de80
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.rs
@@ -0,0 +1,28 @@
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project]
+struct Foo<T> {
+    #[cfg(any())]
+    #[pin]
+    inner: T,
+    #[cfg(not(any()))]
+    inner: T,
+}
+
+#[pin_project]
+struct Bar<T> {
+    #[cfg(any())]
+    inner: T,
+    #[cfg(not(any()))]
+    #[pin]
+    inner: T,
+}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<PhantomPinned>>(); // Ok
+    is_unpin::<Bar<()>>(); // Ok
+    is_unpin::<Bar<PhantomPinned>>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.stderr b/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.stderr
new file mode 100644
index 0000000000..1f58ea218b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/proper_unpin.stderr
@@ -0,0 +1,11 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:27:5
+   |
+22 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+27 |     is_unpin::<Bar<PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `__Bar<'_, std::marker::PhantomPinned>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__Bar<'_, std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Bar<std::marker::PhantomPinned>`
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..5205307d22
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/unsupported.rs
@@ -0,0 +1,13 @@
+use pin_project::pin_project;
+
+//~ ERROR may not be used on structs with zero fields
+// span is lost.
+// Refs: https://github.com/rust-lang/rust/issues/43081
+#[pin_project]
+struct Struct {
+    #[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..0ee8676705
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/cfg/unsupported.stderr
@@ -0,0 +1 @@
+error: #[pin_project] attribute may not be used on structs with zero fields
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..ea7c917d54
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.rs
@@ -0,0 +1,19 @@
+use auxiliary_macros::add_attr;
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project]
+#[add_attr(struct)] //~ ERROR duplicate #[pin] attribute
+struct Foo {
+    #[pin]
+    field: PhantomPinned,
+}
+
+#[add_attr(struct)] //~ ERROR #[pin] attribute may only be used on fields of structs or variants
+#[pin_project]
+struct Bar {
+    #[pin]
+    field: 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..cb2c9638bb
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-attr-to-struct.stderr
@@ -0,0 +1,15 @@
+error: duplicate #[pin] attribute
+ --> $DIR/add-attr-to-struct.rs:6:1
+  |
+6 | #[add_attr(struct)] //~ ERROR duplicate #[pin] attribute
+  | ^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> $DIR/add-attr-to-struct.rs:12:1
+   |
+12 | #[add_attr(struct)] //~ ERROR #[pin] attribute may only be used on fields of structs or variants
+   | ^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in an attribute macro (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..76394cf506
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.rs
@@ -0,0 +1,23 @@
+use auxiliary_macros::add_pinned_field;
+use pin_project::pin_project;
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[add_pinned_field]
+struct Foo {
+    #[pin]
+    field: u32,
+}
+
+#[add_pinned_field]
+#[pin_project]
+struct Bar {
+    #[pin]
+    field: 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..3de6f4ac5a
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/add-pinned-field.stderr
@@ -0,0 +1,23 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/add-pinned-field.rs:21:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+21 |     is_unpin::<Foo>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^ within `__Foo<'_>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__Foo<'_>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Foo`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/add-pinned-field.rs:22:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+22 |     is_unpin::<Bar>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^ within `__Bar<'_>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__Bar<'_>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Bar`
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..c9651848a4
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.rs
@@ -0,0 +1,31 @@
+use pin_project::{pin_project, pinned_drop};
+use std::pin::Pin;
+
+#[pin_project] //~ ERROR E0119
+struct Foo<T, U> {
+    #[pin]
+    future: T,
+    field: U,
+}
+
+impl<T, U> Drop for Foo<T, U> {
+    fn drop(&mut self) {}
+}
+
+#[pin_project(PinnedDrop)] //~ ERROR E0119
+struct Bar<T, U> {
+    #[pin]
+    future: T,
+    field: 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..1724fcc07d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/conflict-drop.stderr
@@ -0,0 +1,21 @@
+error[E0119]: conflicting implementations of trait `FooMustNotImplDrop` for type `Foo<_, _>`:
+ --> $DIR/conflict-drop.rs:4:1
+  |
+4 | #[pin_project] //~ ERROR E0119
+  | ^^^^^^^^^^^^^^
+  | |
+  | first implementation here
+  | conflicting implementation for `Foo<_, _>`
+  |
+  = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `std::ops::Drop` for type `Bar<_, _>`:
+  --> $DIR/conflict-drop.rs:15:1
+   |
+15 | #[pin_project(PinnedDrop)] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Bar<_, _>`
+...
+27 | impl<T, U> Drop for Bar<T, U> {
+   | ----------------------------- first implementation here
+   |
+   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
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..0c48d27907
--- /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]
+    future: T,
+    field: 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]
+    future: T,
+    field: U,
+}
+
+// conflicting implementations
+impl<T, U> Unpin for Bar<T, U> {} // Non-conditional Unpin impl
+
+#[pin_project] //~ ERROR E0119
+struct Baz<T, U> {
+    #[pin]
+    future: T,
+    field: 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..0d6f439b8b
--- /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 `std::marker::Unpin` for type `Foo<_, _>`:
+  --> $DIR/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 a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `std::marker::Unpin` for type `Bar<_, _>`:
+  --> $DIR/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 a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error[E0119]: conflicting implementations of trait `std::marker::Unpin` for type `Baz<_, _>`:
+  --> $DIR/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 a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.rs b/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.rs
new file mode 100644
index 0000000000..df8bf1b751
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.rs
@@ -0,0 +1,27 @@
+use pin_project::pin_project;
+
+#[pin_project(UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+struct UnsafeUnpin<T> {
+    #[pin]
+    pinned: T,
+}
+
+#[pin_project(PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+struct PinnedDrop<T> {
+    #[pin]
+    pinned: T,
+}
+
+#[pin_project(PinnedDrop, UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+struct Duplicate3<T> {
+    #[pin]
+    pinned: T,
+}
+
+#[pin_project(PinnedDrop, UnsafeUnpin, PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+struct Duplicate4<T> {
+    #[pin]
+    pinned: T,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.stderr b/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.stderr
new file mode 100644
index 0000000000..338e3f4e2d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/duplicate-argument.stderr
@@ -0,0 +1,23 @@
+error: duplicate `UnsafeUnpin` argument
+ --> $DIR/duplicate-argument.rs:3:28
+  |
+3 | #[pin_project(UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+  |                            ^^^^^^^^^^^
+
+error: duplicate `PinnedDrop` argument
+ --> $DIR/duplicate-argument.rs:9:27
+  |
+9 | #[pin_project(PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+  |                           ^^^^^^^^^^
+
+error: duplicate `UnsafeUnpin` argument
+  --> $DIR/duplicate-argument.rs:15:40
+   |
+15 | #[pin_project(PinnedDrop, UnsafeUnpin, UnsafeUnpin)] //~ ERROR duplicate `UnsafeUnpin` argument
+   |                                        ^^^^^^^^^^^
+
+error: duplicate `PinnedDrop` argument
+  --> $DIR/duplicate-argument.rs:21:40
+   |
+21 | #[pin_project(PinnedDrop, UnsafeUnpin, PinnedDrop, PinnedDrop)] //~ ERROR duplicate `PinnedDrop` argument
+   |                                        ^^^^^^^^^^
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..f545018c1e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/invalid.rs
@@ -0,0 +1,56 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct A<T> {
+    #[pin()] //~ ERROR unexpected token
+    pinned: T,
+}
+
+#[pin_project]
+struct B<T>(#[pin(foo)] T); //~ ERROR unexpected token
+
+#[pin_project]
+enum C<T> {
+    A(#[pin(foo)] T), //~ ERROR unexpected token
+}
+
+#[pin_project]
+enum D<T> {
+    A {
+        #[pin(foo)] //~ ERROR unexpected token
+        pinned: T,
+    },
+}
+
+#[pin_project(UnsafeUnpin,,)] //~ ERROR expected identifier
+struct E<T> {
+    #[pin]
+    pinned: T,
+}
+
+#[pin_project(Foo)] //~ ERROR unexpected argument
+struct F<T> {
+    #[pin]
+    pinned: T,
+}
+
+#[pin_project]
+enum G<T> {
+    #[pin] //~ ERROR may only be used on fields of structs or variants
+    A(T),
+}
+
+#[pin_project]
+#[pin] //~ ERROR may only be used on fields of structs or variants
+enum H<T> {
+    A(T),
+}
+
+#[pin_project]
+struct I<T> {
+    #[pin]
+    #[pin] //~ ERROR duplicate #[pin] attribute
+    pinned: T,
+}
+
+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..308d476670
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/invalid.stderr
@@ -0,0 +1,53 @@
+error: unexpected token: ()
+ --> $DIR/invalid.rs:5:10
+  |
+5 |     #[pin()] //~ ERROR unexpected token
+  |          ^^
+
+error: unexpected token: (foo)
+  --> $DIR/invalid.rs:10:18
+   |
+10 | struct B<T>(#[pin(foo)] T); //~ ERROR unexpected token
+   |                  ^^^^^
+
+error: unexpected token: (foo)
+  --> $DIR/invalid.rs:14:12
+   |
+14 |     A(#[pin(foo)] T), //~ ERROR unexpected token
+   |            ^^^^^
+
+error: unexpected token: (foo)
+  --> $DIR/invalid.rs:20:14
+   |
+20 |         #[pin(foo)] //~ ERROR unexpected token
+   |              ^^^^^
+
+error: expected identifier
+  --> $DIR/invalid.rs:25:27
+   |
+25 | #[pin_project(UnsafeUnpin,,)] //~ ERROR expected identifier
+   |                           ^
+
+error: unexpected argument: Foo
+  --> $DIR/invalid.rs:31:15
+   |
+31 | #[pin_project(Foo)] //~ ERROR unexpected argument
+   |               ^^^
+
+error: #[pin] attribute may only be used on fields of structs or variants
+  --> $DIR/invalid.rs:39:5
+   |
+39 |     #[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
+  --> $DIR/invalid.rs:44:1
+   |
+44 | #[pin] //~ ERROR may only be used on fields of structs or variants
+   | ^^^^^^
+
+error: duplicate #[pin] attribute
+  --> $DIR/invalid.rs:52:5
+   |
+52 |     #[pin] //~ ERROR duplicate #[pin] attribute
+   |     ^^^^^^
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..00fef3cc3b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.rs
@@ -0,0 +1,18 @@
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project]
+struct Foo<T> {
+    #[pin]
+    inner: T,
+}
+
+struct __Foo {}
+
+impl Unpin for __Foo {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<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..60f4116dbd
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/overlapping_unpin_struct.stderr
@@ -0,0 +1,11 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/overlapping_unpin_struct.rs:17:5
+   |
+14 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+17 |     is_unpin::<Foo<PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `__Foo<'_, std::marker::PhantomPinned>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__Foo<'_, std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Foo<std::marker::PhantomPinned>`
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..86f3ecf33d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed.rs
@@ -0,0 +1,25 @@
+use pin_project::pin_project;
+
+#[pin_project]
+#[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+struct A {
+    #[pin]
+    field: u8,
+}
+
+// Test putting 'repr' before the 'pin_project' attribute
+#[repr(packed, C)] //~ ERROR may not be used on #[repr(packed)] types
+#[pin_project]
+struct B {
+    #[pin]
+    field: u8,
+}
+
+#[pin_project]
+#[repr(packed(2))] //~ ERROR may not be used on #[repr(packed)] types
+struct C {
+    #[pin]
+    field: 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..969faea211
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed.stderr
@@ -0,0 +1,17 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> $DIR/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
+  --> $DIR/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
+  --> $DIR/packed.rs:19:8
+   |
+19 | #[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..dcf5464e4c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.rs
@@ -0,0 +1,33 @@
+use auxiliary_macros::hidden_repr;
+use pin_project::{pin_project, pinned_drop, UnsafeUnpin};
+use std::pin::Pin;
+
+#[pin_project] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct A {
+    #[pin]
+    field: u32,
+}
+
+#[pin_project(UnsafeUnpin)] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct C {
+    #[pin]
+    field: u32,
+}
+
+unsafe impl UnsafeUnpin for C {}
+
+#[pin_project(PinnedDrop)] //~ ERROR may not be used on #[repr(packed)] types
+#[hidden_repr(packed)]
+struct D {
+    #[pin]
+    field: 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..06a4f6266c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-1.stderr
@@ -0,0 +1,23 @@
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+ --> $DIR/packed_sneaky-1.rs:6:1
+  |
+6 | #[hidden_repr(packed)]
+  | ^^^^^^^^^^^^^^^^^^^^^^
+  |
+  = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> $DIR/packed_sneaky-1.rs:13:1
+   |
+13 | #[hidden_repr(packed)]
+   | ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in an attribute macro (in Nightly builds, run with -Z macro-backtrace for more info)
+
+error: #[pin_project] attribute may not be used on #[repr(packed)] types
+  --> $DIR/packed_sneaky-1.rs:22:1
+   |
+22 | #[hidden_repr(packed)]
+   | ^^^^^^^^^^^^^^^^^^^^^^
+   |
+   = note: this error originates in an attribute 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-2.rs b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.rs
new file mode 100644
index 0000000000..d16270635e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/packed_sneaky-2.rs
@@ -0,0 +1,12 @@
+use auxiliary_macros::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]
+        field: 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..d653a4d29f
--- /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
+  --> $DIR/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  | |         field: u32,
+9  | |     }
+10 | | }
+   | |_^
+   |
+   = note: this error originates in a macro (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..66ddefa4d8
--- /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)]
+
+pub enum PublicEnum {
+    Variant(PrivateEnum),
+}
+
+enum PrivateEnum {
+    Variant(u8),
+}
+
+mod foo {
+    pub(crate) enum CrateEnum {
+        Variant(PrivateEnum),
+    }
+
+    enum PrivateEnum {
+        Variant(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..2a5ae992c0
--- /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
+ --> $DIR/private_in_public-enum.rs:6:13
+  |
+6 |     Variant(PrivateEnum),
+  |             ^^^^^^^^^^^ can't leak private type
+...
+9 | enum PrivateEnum {
+  | - `PrivateEnum` declared as private
+
+error[E0446]: private type `foo::PrivateEnum` in public interface
+  --> $DIR/private_in_public-enum.rs:15:17
+   |
+15 |         Variant(PrivateEnum),
+   |                 ^^^^^^^^^^^ 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/proper_unpin.rs b/third_party/rust/pin-project/tests/ui/pin_project/proper_unpin.rs
new file mode 100644
index 0000000000..7121cc84a3
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/proper_unpin.rs
@@ -0,0 +1,38 @@
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+struct Inner<T> {
+    val: T,
+}
+
+#[pin_project]
+struct Foo<T, U> {
+    #[pin]
+    inner: Inner<T>,
+    other: U,
+}
+
+#[pin_project]
+pub struct TrivialBounds {
+    #[pin]
+    field1: PhantomPinned,
+}
+
+#[pin_project]
+struct Bar<'a, T, U> {
+    #[pin]
+    inner: &'a mut Inner<T>,
+    other: U,
+}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<PhantomPinned, ()>>(); //~ ERROR E0277
+    is_unpin::<Foo<(), PhantomPinned>>(); // Ok
+    is_unpin::<Foo<PhantomPinned, PhantomPinned>>(); //~ ERROR E0277
+
+    is_unpin::<TrivialBounds>(); //~ ERROR E0277
+
+    is_unpin::<Bar<'_, PhantomPinned, PhantomPinned>>(); //~ Ok
+}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/proper_unpin.stderr b/third_party/rust/pin-project/tests/ui/pin_project/proper_unpin.stderr
new file mode 100644
index 0000000000..73fd289438
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/proper_unpin.stderr
@@ -0,0 +1,37 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:31:5
+   |
+28 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+31 |     is_unpin::<Foo<PhantomPinned, ()>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `__Foo<'_, std::marker::PhantomPinned, ()>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Inner<std::marker::PhantomPinned>`
+   = note: required because it appears within the type `__Foo<'_, std::marker::PhantomPinned, ()>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Foo<std::marker::PhantomPinned, ()>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:33:5
+   |
+28 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+33 |     is_unpin::<Foo<PhantomPinned, PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `__Foo<'_, std::marker::PhantomPinned, std::marker::PhantomPinned>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Inner<std::marker::PhantomPinned>`
+   = note: required because it appears within the type `__Foo<'_, std::marker::PhantomPinned, std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Foo<std::marker::PhantomPinned, std::marker::PhantomPinned>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:35:5
+   |
+28 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+35 |     is_unpin::<TrivialBounds>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^ within `__TrivialBounds<'_>`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `__TrivialBounds<'_>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `TrivialBounds`
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..eebd3cd27f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-field.rs
@@ -0,0 +1,32 @@
+use auxiliary_macros::remove_attr;
+use pin_project::pin_project;
+use std::{marker::PhantomPinned, pin::Pin};
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[remove_attr(field)]
+struct Foo {
+    #[pin]
+    field: PhantomPinned,
+}
+
+#[remove_attr(field)]
+#[pin_project]
+struct Bar {
+    #[pin]
+    field: PhantomPinned,
+}
+
+fn main() {
+    is_unpin::<Foo>();
+    is_unpin::<Bar>();
+
+    let mut x = Foo { field: PhantomPinned };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut PhantomPinned> = x.field; //~ ERROR E0308
+
+    let mut x = Bar { field: PhantomPinned };
+    let x = Pin::new(&mut x).project();
+    let _: Pin<&mut PhantomPinned> = x.field; //~ 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..15195e7737
--- /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
+  --> $DIR/remove-attr-from-field.rs:27:38
+   |
+27 |     let _: Pin<&mut PhantomPinned> = x.field; //~ ERROR E0308
+   |            -----------------------   ^^^^^^^ expected struct `std::pin::Pin`, found `&mut std::marker::PhantomPinned`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `std::pin::Pin<&mut std::marker::PhantomPinned>`
+           found mutable reference `&mut std::marker::PhantomPinned`
+
+error[E0308]: mismatched types
+  --> $DIR/remove-attr-from-field.rs:31:38
+   |
+31 |     let _: Pin<&mut PhantomPinned> = x.field; //~ ERROR E0308
+   |            -----------------------   ^^^^^^^ expected struct `std::pin::Pin`, found `&mut std::marker::PhantomPinned`
+   |            |
+   |            expected due to this
+   |
+   = note:         expected struct `std::pin::Pin<&mut std::marker::PhantomPinned>`
+           found mutable reference `&mut std::marker::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..b395a42354
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.rs
@@ -0,0 +1,30 @@
+use auxiliary_macros::remove_attr;
+use pin_project::pin_project;
+use std::{marker::PhantomPinned, pin::Pin};
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project]
+#[remove_attr(struct)]
+struct Foo {
+    #[pin] //~ ERROR cannot find attribute `pin` in this scope
+    field: PhantomPinned,
+}
+
+#[remove_attr(struct)]
+#[pin_project]
+struct Bar {
+    #[pin] //~ ERROR cannot find attribute `pin` in this scope
+    field: PhantomPinned,
+}
+
+fn main() {
+    is_unpin::<Foo>(); //~ ERROR E0277
+    is_unpin::<Bar>(); //~ ERROR E0277
+
+    let mut x = Foo { field: PhantomPinned };
+    let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+
+    let mut x = Bar { field: PhantomPinned };
+    let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+}
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..3173248daa
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/remove-attr-from-struct.stderr
@@ -0,0 +1,63 @@
+error: cannot find attribute `pin` in this scope
+  --> $DIR/remove-attr-from-struct.rs:10:7
+   |
+10 |     #[pin] //~ ERROR cannot find attribute `pin` in this scope
+   |       ^^^
+
+error: cannot find attribute `pin` in this scope
+  --> $DIR/remove-attr-from-struct.rs:17:7
+   |
+17 |     #[pin] //~ ERROR cannot find attribute `pin` in this scope
+   |       ^^^
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/remove-attr-from-struct.rs:22:5
+   |
+5  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+22 |     is_unpin::<Foo>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^ within `Foo`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Foo`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/remove-attr-from-struct.rs:23:5
+   |
+5  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+23 |     is_unpin::<Bar>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^ within `Bar`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Bar`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/remove-attr-from-struct.rs:26:14
+   |
+26 |     let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |              ^^^^^^^^ within `Foo`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Foo`
+   = note: required by `std::pin::Pin::<P>::new`
+
+error[E0599]: no method named `project` found for struct `std::pin::Pin<&mut Foo>` in the current scope
+  --> $DIR/remove-attr-from-struct.rs:26:31
+   |
+26 |     let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |                               ^^^^^^^ method not found in `std::pin::Pin<&mut Foo>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/remove-attr-from-struct.rs:29:14
+   |
+29 |     let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |              ^^^^^^^^ within `Bar`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `Bar`
+   = note: required by `std::pin::Pin::<P>::new`
+
+error[E0599]: no method named `project` found for struct `std::pin::Pin<&mut Bar>` in the current scope
+  --> $DIR/remove-attr-from-struct.rs:29:31
+   |
+29 |     let _x = Pin::new(&mut x).project(); //~ ERROR E0277,E0599
+   |                               ^^^^^^^ method not found in `std::pin::Pin<&mut Bar>`
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..c1a7d55dda
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.rs
@@ -0,0 +1,21 @@
+#![deny(safe_packed_borrows)]
+
+// Refs: https://github.com/rust-lang/rust/issues/46043
+
+#[repr(packed)]
+struct A {
+    field: u32,
+}
+
+#[repr(packed(2))]
+struct B {
+    field: u32,
+}
+
+fn main() {
+    let a = A { field: 1 };
+    &a.field; //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+
+    let b = B { field: 1 };
+    &b.field; //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+}
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..7b4cc08ec6
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/safe_packed_borrows.stderr
@@ -0,0 +1,24 @@
+error: borrow of packed field is unsafe and requires unsafe function or block (error E0133)
+  --> $DIR/safe_packed_borrows.rs:17:5
+   |
+17 |     &a.field; //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+   |     ^^^^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/safe_packed_borrows.rs:1:9
+   |
+1  | #![deny(safe_packed_borrows)]
+   |         ^^^^^^^^^^^^^^^^^^^
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #46043 <https://github.com/rust-lang/rust/issues/46043>
+   = note: fields of packed structs might be misaligned: dereferencing a misaligned pointer or even just creating a misaligned reference is undefined behavior
+
+error: borrow of packed field is unsafe and requires unsafe function or block (error E0133)
+  --> $DIR/safe_packed_borrows.rs:20:5
+   |
+20 |     &b.field; //~ ERROR borrow of packed field is unsafe and requires unsafe function or block
+   |     ^^^^^^^^
+   |
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = note: for more information, see issue #46043 <https://github.com/rust-lang/rust/issues/46043>
+   = note: fields of packed structs might be misaligned: dereferencing a misaligned pointer or even just creating a misaligned reference is undefined behavior
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..3ccb1a95d1
--- /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 Foo {
+    #[pin]
+    inner: u8,
+}
+
+impl Unpin for __Foo {} //~ 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..d96050bb54
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unpin_sneaky.stderr
@@ -0,0 +1,16 @@
+error[E0412]: cannot find type `__Foo` in this scope
+ --> $DIR/unpin_sneaky.rs:9:16
+  |
+9 | impl Unpin for __Foo {} //~ ERROR E0412,E0321
+  |                ^^^^^ not found in this scope
+  |
+help: possible candidate is found in another module, you can import it into scope
+  |
+1 | use crate::__Foo;
+  |
+
+error[E0321]: cross-crate traits with a default impl, like `std::marker::Unpin`, can only be implemented for a struct/enum type, not `[type error]`
+ --> $DIR/unpin_sneaky.rs:9:1
+  |
+9 | impl Unpin for __Foo {} //~ ERROR E0412,E0321
+  | ^^^^^^^^^^^^^^^^^^^^ can't implement cross-crate trait with a default impl for non-struct/enum type
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unsupported.rs b/third_party/rust/pin-project/tests/ui/pin_project/unsupported.rs
new file mode 100644
index 0000000000..f7b8eb94a0
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unsupported.rs
@@ -0,0 +1,32 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct Struct1 {} //~ ERROR may not be used on structs with zero fields
+
+#[pin_project]
+struct Struct2(); //~ ERROR may not be used on structs with zero fields
+
+#[pin_project]
+struct Struct3; //~ ERROR may not be used on structs with units
+
+#[pin_project]
+enum Enum1 {} //~ ERROR may not be used on enums without variants
+
+#[pin_project]
+enum Enum2 {
+    A = 2, //~ ERROR may not be used on enums with discriminants
+}
+
+#[pin_project]
+enum Enum3 {
+    A, //~ ERROR may not be used on enums that have no field
+    B,
+}
+
+#[pin_project]
+union Union {
+    //~^ ERROR may only be used on structs or enums
+    x: u8,
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pin_project/unsupported.stderr b/third_party/rust/pin-project/tests/ui/pin_project/unsupported.stderr
new file mode 100644
index 0000000000..89ffd949f5
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pin_project/unsupported.stderr
@@ -0,0 +1,45 @@
+error: #[pin_project] attribute may not be used on structs with zero fields
+ --> $DIR/unsupported.rs:4:16
+  |
+4 | struct Struct1 {} //~ ERROR may not be used on structs with zero fields
+  |                ^^
+
+error: #[pin_project] attribute may not be used on structs with zero fields
+ --> $DIR/unsupported.rs:7:15
+  |
+7 | struct Struct2(); //~ ERROR may not be used on structs with zero fields
+  |               ^^
+
+error: #[pin_project] attribute may not be used on structs with units
+  --> $DIR/unsupported.rs:10:8
+   |
+10 | struct Struct3; //~ ERROR may not be used on structs with units
+   |        ^^^^^^^
+
+error: #[pin_project] attribute may not be used on enums without variants
+  --> $DIR/unsupported.rs:13:12
+   |
+13 | enum Enum1 {} //~ ERROR may not be used on enums without variants
+   |            ^^
+
+error: #[pin_project] attribute may not be used on enums with discriminants
+  --> $DIR/unsupported.rs:17:9
+   |
+17 |     A = 2, //~ ERROR may not be used on enums with discriminants
+   |         ^
+
+error: #[pin_project] attribute may not be used on enums that have no field
+  --> $DIR/unsupported.rs:22:5
+   |
+22 | /     A, //~ ERROR may not be used on enums that have no field
+23 | |     B,
+   | |______^
+
+error: #[pin_project] attribute may only be used on structs or enums
+  --> $DIR/unsupported.rs:27:1
+   |
+27 | / union Union {
+28 | |     //~^ ERROR may only be used on structs or enums
+29 | |     x: u8,
+30 | | }
+   | |_^
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..b291fbae54
--- /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
+pub struct Struct {
+    #[pin]
+    field: 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..67bdbe11bd
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/forget-pinned-drop-impl.stderr
@@ -0,0 +1,7 @@
+error[E0277]: the trait bound `Struct: pin_project::__private::PinnedDrop` is not satisfied
+ --> $DIR/forget-pinned-drop-impl.rs:3:15
+  |
+3 | #[pin_project(PinnedDrop)] //~ ERROR E0277
+  |               ^^^^^^^^^^ the trait `pin_project::__private::PinnedDrop` is not implemented for `Struct`
+  |
+  = note: required by `pin_project::__private::PinnedDrop::drop`
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..651d76856e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.rs
@@ -0,0 +1,152 @@
+use pin_project::{pin_project, pinned_drop};
+
+#[pin_project(PinnedDrop)]
+pub struct A {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop(foo)] //~ ERROR unexpected token
+impl PinnedDrop for A {
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct B {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl Drop for B {
+    //~^ ERROR #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+    fn drop(&mut self) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct C {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl C {
+    //~^ ERROR #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+    fn drop(&mut self) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct D {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for D {
+    fn drop(&mut self) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+}
+
+#[pin_project(PinnedDrop)]
+pub struct E {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for E {
+    fn drop_baz(&mut self) {} //~ ERROR method `drop_baz` is not a member of trait `PinnedDrop
+}
+
+#[pin_project(PinnedDrop)]
+pub struct F {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+unsafe impl PinnedDrop for F {
+    //~^ ERROR implementing the trait `PinnedDrop` is not unsafe
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct G {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for G {
+    unsafe fn drop(self: Pin<&mut Self>) {} //~ ERROR implementing the method `drop` is not unsafe
+}
+
+#[pin_project(PinnedDrop)]
+pub struct H {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for H {
+    const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct I {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for I {
+    fn drop(self: Pin<&mut Self>) {}
+    const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+}
+
+#[pin_project(PinnedDrop)]
+pub struct J {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for J {
+    type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    fn drop(self: Pin<&mut Self>) {}
+}
+
+#[pin_project(PinnedDrop)]
+pub struct K {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for K {
+    fn drop(self: Pin<&mut Self>) {}
+    type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+}
+
+#[pin_project(PinnedDrop)]
+pub struct L {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for L {
+    fn drop(self: Pin<&mut Self>) {}
+    fn drop(self: Pin<&mut Self>) {} //~ ERROR duplicate definitions with name `drop`
+}
+
+#[pin_project(PinnedDrop)] //~ ERROR E0277
+pub struct M {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+fn drop(_this: Pin<&mut M>) {} //~ ERROR expected `impl`
+
+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..c767fbb113
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/invalid.stderr
@@ -0,0 +1,85 @@
+error: unexpected token: foo
+ --> $DIR/invalid.rs:9:15
+  |
+9 | #[pinned_drop(foo)] //~ ERROR unexpected token
+  |               ^^^
+
+error: #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+  --> $DIR/invalid.rs:21:6
+   |
+21 | impl Drop for B {
+   |      ^^^^
+
+error: #[pinned_drop] may only be used on implementation for the `PinnedDrop` trait
+  --> $DIR/invalid.rs:33:6
+   |
+33 | impl C {
+   |      ^
+
+error: method `drop` must take an argument `self: Pin<&mut Self>`
+  --> $DIR/invalid.rs:46:13
+   |
+46 |     fn drop(&mut self) {} //~ ERROR method `drop` must take an argument `self: Pin<&mut Self>`
+   |             ^^^^^^^^^
+
+error: method `drop_baz` is not a member of trait `PinnedDrop
+  --> $DIR/invalid.rs:57:8
+   |
+57 |     fn drop_baz(&mut self) {} //~ ERROR method `drop_baz` is not a member of trait `PinnedDrop
+   |        ^^^^^^^^
+
+error: implementing the trait `PinnedDrop` is not unsafe
+  --> $DIR/invalid.rs:67:1
+   |
+67 | unsafe impl PinnedDrop for F {
+   | ^^^^^^
+
+error: implementing the method `drop` is not unsafe
+  --> $DIR/invalid.rs:80:5
+   |
+80 |     unsafe fn drop(self: Pin<&mut Self>) {} //~ ERROR implementing the method `drop` is not unsafe
+   |     ^^^^^^
+
+error: const `A` is not a member of trait `PinnedDrop`
+  --> $DIR/invalid.rs:91:5
+   |
+91 |     const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+   |     ^^^^^^^^^^^^^^^^
+
+error: const `A` is not a member of trait `PinnedDrop`
+   --> $DIR/invalid.rs:104:5
+    |
+104 |     const A: u8 = 0; //~ ERROR const `A` is not a member of trait `PinnedDrop`
+    |     ^^^^^^^^^^^^^^^^
+
+error: type `A` is not a member of trait `PinnedDrop`
+   --> $DIR/invalid.rs:115:5
+    |
+115 |     type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    |     ^^^^^^^^^^^^
+
+error: type `A` is not a member of trait `PinnedDrop`
+   --> $DIR/invalid.rs:128:5
+    |
+128 |     type A = u8; //~ ERROR type `A` is not a member of trait `PinnedDrop`
+    |     ^^^^^^^^^^^^
+
+error: duplicate definitions with name `drop`
+   --> $DIR/invalid.rs:140:5
+    |
+140 |     fn drop(self: Pin<&mut Self>) {} //~ ERROR duplicate definitions with name `drop`
+    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+
+error: expected `impl`
+   --> $DIR/invalid.rs:150:1
+    |
+150 | fn drop(_this: Pin<&mut M>) {} //~ ERROR expected `impl`
+    | ^^
+
+error[E0277]: the trait bound `M: pin_project::__private::PinnedDrop` is not satisfied
+   --> $DIR/invalid.rs:143:15
+    |
+143 | #[pin_project(PinnedDrop)] //~ ERROR E0277
+    |               ^^^^^^^^^^ the trait `pin_project::__private::PinnedDrop` is not implemented for `M`
+    |
+    = note: required by `pin_project::__private::PinnedDrop::drop`
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..1241b5be84
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/pinned-drop-no-attr-arg.rs
@@ -0,0 +1,15 @@
+use pin_project::{pin_project, pinned_drop};
+use std::pin::Pin;
+
+#[pin_project]
+struct Foo {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for Foo { //~ 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..7353dc483b
--- /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 `pin_project::__private::PinnedDrop` for type `Foo`:
+  --> $DIR/pinned-drop-no-attr-arg.rs:11:1
+   |
+4  | #[pin_project]
+   | -------------- first implementation here
+...
+11 | impl PinnedDrop for Foo { //~ ERROR E0119
+   | ^^^^^^^^^^^^^^^^^^^^^^^ conflicting implementation for `Foo`
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.rs
new file mode 100644
index 0000000000..79ae05cd7e
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.rs
@@ -0,0 +1,14 @@
+// `ref (mut) self` are rejected by rustc.
+
+use std::pin::Pin;
+
+pub struct Struct {
+    field: u8,
+}
+
+impl Struct {
+    fn method_ref(ref self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+    fn method_ref_mut(ref mut self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.stderr
new file mode 100644
index 0000000000..3ab489813c
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/ref-self.stderr
@@ -0,0 +1,11 @@
+error: expected identifier, found keyword `self`
+  --> $DIR/ref-self.rs:10:23
+   |
+10 |     fn method_ref(ref self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+   |                       ^^^^ expected identifier, found keyword
+
+error: expected identifier, found keyword `self`
+  --> $DIR/ref-self.rs:11:31
+   |
+11 |     fn method_ref_mut(ref mut self: Pin<&mut Self>) {} //~ ERROR expected identifier, found keyword `self`
+   |                               ^^^^ expected identifier, found keyword
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..6d552a71a6
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/self.rs
@@ -0,0 +1,93 @@
+use pin_project::{pin_project, pinned_drop};
+use std::pin::Pin;
+
+fn self_expr() {
+    #[pin_project(PinnedDrop)]
+    pub struct Struct {
+        x: usize,
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for Struct {
+        fn drop(mut self: Pin<&mut Self>) {
+            let _: Self = Self { x: 0 };
+        }
+    }
+
+    #[pin_project(PinnedDrop)]
+    pub struct TupleStruct(usize);
+
+    #[pinned_drop]
+    impl PinnedDrop for TupleStruct {
+        fn drop(mut self: Pin<&mut Self>) {
+            let _: Self = Self(0);
+        }
+    }
+
+    #[pin_project(PinnedDrop)]
+    pub enum Enum {
+        StructVariant { x: usize },
+        TupleVariant(usize),
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for Enum {
+        fn drop(mut self: Pin<&mut Self>) {
+            let _: Self = Self::StructVariant { x: 0 }; //~ ERROR can't use generic parameters from outer function [E0401]
+            let _: Self = Self::TupleVariant(0);
+        }
+    }
+}
+
+fn self_pat() {
+    #[pin_project(PinnedDrop)]
+    pub struct Struct {
+        x: usize,
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for Struct {
+        fn drop(mut self: Pin<&mut Self>) {
+            match *self {
+                Self { x: _ } => {} //~ ERROR can't use generic parameters from outer function [E0401]
+            }
+            if let Self { x: _ } = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+            let Self { x: _ } = *self; //~ ERROR can't use generic parameters from outer function [E0401]
+        }
+    }
+
+    #[pin_project(PinnedDrop)]
+    pub struct TupleStruct(usize);
+
+    #[pinned_drop]
+    impl PinnedDrop for TupleStruct {
+        #[allow(irrefutable_let_patterns)]
+        fn drop(mut self: Pin<&mut Self>) {
+            match *self {
+                Self(_) => {}
+            }
+            if let Self(_) = *self {}
+            let Self(_) = *self;
+        }
+    }
+
+    #[pin_project(PinnedDrop)]
+    pub enum Enum {
+        StructVariant { x: usize },
+        TupleVariant(usize),
+    }
+
+    #[pinned_drop]
+    impl PinnedDrop for Enum {
+        fn drop(mut self: Pin<&mut Self>) {
+            match *self {
+                Self::StructVariant { x: _ } => {} //~ ERROR can't use generic parameters from outer function [E0401]
+                Self::TupleVariant(_) => {} //~ ERROR can't use generic parameters from outer function [E0401]
+            }
+            if let Self::StructVariant { x: _ } = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+            if let Self::TupleVariant(_) = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+        }
+    }
+}
+
+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..54c7b676a3
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/self.stderr
@@ -0,0 +1,95 @@
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:36:27
+   |
+34 |     impl PinnedDrop for Enum {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+35 |         fn drop(mut self: Pin<&mut Self>) {
+36 |             let _: Self = Self::StructVariant { x: 0 }; //~ ERROR can't use generic parameters from outer function [E0401]
+   |                           ^^^^^^^^^^^^^^^^^^^
+   |                           |
+   |                           use of generic parameter from outer function
+   |                           use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:52:17
+   |
+49 |     impl PinnedDrop for Struct {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+52 |                 Self { x: _ } => {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                 ^^^^
+   |                 |
+   |                 use of generic parameter from outer function
+   |                 use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:54:20
+   |
+49 |     impl PinnedDrop for Struct {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+54 |             if let Self { x: _ } = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                    ^^^^
+   |                    |
+   |                    use of generic parameter from outer function
+   |                    use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:55:17
+   |
+49 |     impl PinnedDrop for Struct {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+55 |             let Self { x: _ } = *self; //~ ERROR can't use generic parameters from outer function [E0401]
+   |                 ^^^^
+   |                 |
+   |                 use of generic parameter from outer function
+   |                 use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:84:17
+   |
+81 |     impl PinnedDrop for Enum {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+84 |                 Self::StructVariant { x: _ } => {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                 ^^^^^^^^^^^^^^^^^^^
+   |                 |
+   |                 use of generic parameter from outer function
+   |                 use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:85:17
+   |
+81 |     impl PinnedDrop for Enum {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+85 |                 Self::TupleVariant(_) => {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                 ^^^^^^^^^^^^^^^^^^
+   |                 |
+   |                 use of generic parameter from outer function
+   |                 use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:87:20
+   |
+81 |     impl PinnedDrop for Enum {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+87 |             if let Self::StructVariant { x: _ } = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                    ^^^^^^^^^^^^^^^^^^^
+   |                    |
+   |                    use of generic parameter from outer function
+   |                    use a type here instead
+
+error[E0401]: can't use generic parameters from outer function
+  --> $DIR/self.rs:88:20
+   |
+81 |     impl PinnedDrop for Enum {
+   |     ---- `Self` type implicitly declared here, by this `impl`
+...
+88 |             if let Self::TupleVariant(_) = *self {} //~ ERROR can't use generic parameters from outer function [E0401]
+   |                    ^^^^^^^^^^^^^^^^^^
+   |                    |
+   |                    use of generic parameter from outer function
+   |                    use a type here instead
diff --git a/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-code.rs b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-code.rs
new file mode 100644
index 0000000000..78f8a11ced
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-code.rs
@@ -0,0 +1,17 @@
+use pin_project::{pin_project, pinned_drop};
+use std::pin::Pin;
+
+#[pin_project(PinnedDrop)]
+pub struct Struct {
+    #[pin]
+    field: u8,
+}
+
+#[pinned_drop]
+impl PinnedDrop for Struct {
+    fn drop(self: Pin<&mut Self>) {
+        self.project().field.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-code.stderr b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-code.stderr
new file mode 100644
index 0000000000..98a945f6eb
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/pinned_drop/unsafe-code.stderr
@@ -0,0 +1,7 @@
+error[E0133]: call to unsafe function is unsafe and requires unsafe function or block
+  --> $DIR/unsafe-code.rs:13:9
+   |
+13 |         self.project().field.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/project/ambiguous-let.rs b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.rs
new file mode 100644
index 0000000000..a7067494ec
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.rs
@@ -0,0 +1,24 @@
+use pin_project::{pin_project, project};
+
+#[pin_project]
+enum Enum<A, B> {
+    A(#[pin] A),
+    B(B),
+}
+
+struct Struct<T>(T);
+
+#[project]
+fn foo() {
+    let mut foo: Enum<bool, bool> = Enum::A(true);
+
+    #[project]
+    let Struct(x) = match Pin::new(&mut foo).project() {
+        //~^ ERROR Both initializer expression and pattern are replaceable, you need to split the initializer expression into separate let bindings to avoid ambiguity
+        Enum::A(_) => Struct(true),
+        Enum::B(_) => unreachable!(),
+    };
+    assert!(x);
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/project/ambiguous-let.stderr b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.stderr
new file mode 100644
index 0000000000..e6552c83ec
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/ambiguous-let.stderr
@@ -0,0 +1,5 @@
+error: Both initializer expression and pattern are replaceable, you need to split the initializer expression into separate let bindings to avoid ambiguity
+  --> $DIR/ambiguous-let.rs:16:9
+   |
+16 |     let Struct(x) = match Pin::new(&mut foo).project() {
+   |         ^^^^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/project/invalid.rs b/third_party/rust/pin-project/tests/ui/project/invalid.rs
new file mode 100644
index 0000000000..bc7226deb2
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/invalid.rs
@@ -0,0 +1,24 @@
+use pin_project::{pin_project, project};
+
+#[pin_project]
+struct A<T> {
+    #[pin]
+    future: T,
+}
+
+#[project]
+fn foo() {
+    let mut x = A { future: 0 };
+    #[project(foo)] //~ ERROR unexpected token
+    let A { future } = Pin::new(&mut x).project();
+}
+
+#[project]
+fn bar() {
+    let mut x = A { future: 0 };
+    #[project]
+    #[project] //~ ERROR duplicate #[project] attribute
+    let A { future } = Pin::new(&mut x).project();
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/project/invalid.stderr b/third_party/rust/pin-project/tests/ui/project/invalid.stderr
new file mode 100644
index 0000000000..a361b72aa3
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/invalid.stderr
@@ -0,0 +1,11 @@
+error: unexpected token: (foo)
+  --> $DIR/invalid.rs:12:14
+   |
+12 |     #[project(foo)] //~ ERROR unexpected token
+   |              ^^^^^
+
+error: duplicate #[project] attribute
+  --> $DIR/invalid.rs:20:5
+   |
+20 |     #[project] //~ ERROR duplicate #[project] attribute
+   |     ^^^^^^^^^^
diff --git a/third_party/rust/pin-project/tests/ui/project/type-mismatch.rs b/third_party/rust/pin-project/tests/ui/project/type-mismatch.rs
new file mode 100644
index 0000000000..41a70eb87b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/type-mismatch.rs
@@ -0,0 +1,74 @@
+#![feature(proc_macro_hygiene, stmt_expr_attributes)]
+
+use pin_project::{pin_project, project};
+use std::pin::Pin;
+
+#[project]
+fn type_mismatch() {
+    #[pin_project]
+    enum Enum<A, B, C, D> {
+        Variant1(#[pin] A, B),
+        Variant2 {
+            #[pin]
+            field1: C,
+            field2: D,
+        },
+        None,
+    }
+
+    let mut foo = Enum::Variant1(1, 2);
+    let mut foo = Pin::new(&mut foo).project();
+
+    #[project]
+    match &mut foo {
+        Enum::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Enum::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        None => {} //~ ERROR mismatched types
+    }
+}
+
+//~ ERROR mismatched types
+// span is lost.
+// Refs: https://github.com/rust-lang/rust/issues/43081
+fn type_mismatch_span_issue() {
+    #[pin_project]
+    enum Enum<A, B, C, D> {
+        Variant1(#[pin] A, B),
+        Variant2 {
+            #[pin]
+            field1: C,
+            field2: D,
+        },
+        None,
+    }
+
+    let mut foo = Enum::Variant1(1, 2);
+    let mut foo = Pin::new(&mut foo).project();
+
+    #[project]
+    match &mut foo {
+        Enum::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Enum::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        None => {}
+    }
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/project/type-mismatch.stderr b/third_party/rust/pin-project/tests/ui/project/type-mismatch.stderr
new file mode 100644
index 0000000000..b4c97d5a99
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/type-mismatch.stderr
@@ -0,0 +1,16 @@
+error[E0308]: mismatched types
+  --> $DIR/type-mismatch.rs:35:9
+   |
+23 |     match &mut foo {
+   |           -------- this expression has type `&mut type_mismatch::__EnumProjection<'_, {integer}, {integer}, _, _>`
+...
+35 |         None => {} //~ ERROR mismatched types
+   |         ^^^^ expected enum `type_mismatch::__EnumProjection`, found enum `std::option::Option`
+   |
+   = note: expected enum `type_mismatch::__EnumProjection<'_, {integer}, {integer}, _, _>`
+              found enum `std::option::Option<_>`
+
+error[E0308]: mismatched types
+  |
+  = note: expected enum `type_mismatch_span_issue::__EnumProjection<'_, {integer}, {integer}, _, _>`
+             found enum `std::option::Option<_>`
diff --git a/third_party/rust/pin-project/tests/ui/project/use-public.rs b/third_party/rust/pin-project/tests/ui/project/use-public.rs
new file mode 100644
index 0000000000..23c9b89d00
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/use-public.rs
@@ -0,0 +1,15 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct A {
+    field: u8,
+}
+
+pub mod b {
+    use pin_project::project;
+
+    #[project]
+    pub use crate::A; //~ ERROR E0365
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/project/use-public.stderr b/third_party/rust/pin-project/tests/ui/project/use-public.stderr
new file mode 100644
index 0000000000..7919d65cbe
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/use-public.stderr
@@ -0,0 +1,7 @@
+error[E0365]: `__AProjection` is private, and cannot be re-exported
+  --> $DIR/use-public.rs:12:13
+   |
+12 |     pub use crate::A; //~ ERROR E0365
+   |             ^^^^^^^^ re-export of private `__AProjection`
+   |
+   = note: consider declaring type or module `__AProjection` with `pub`
diff --git a/third_party/rust/pin-project/tests/ui/project/use.rs b/third_party/rust/pin-project/tests/ui/project/use.rs
new file mode 100644
index 0000000000..d4b02c1d60
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/use.rs
@@ -0,0 +1,17 @@
+use pin_project::pin_project;
+
+#[pin_project]
+struct A {
+    field: u8,
+}
+
+mod b {
+    use pin_project::project;
+
+    #[project]
+    use crate::A as B; //~ ERROR #[project] attribute may not be used on renamed imports
+    #[project]
+    use crate::*; //~ ERROR #[project] attribute may not be used on glob imports
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/project/use.stderr b/third_party/rust/pin-project/tests/ui/project/use.stderr
new file mode 100644
index 0000000000..07d024160b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/project/use.stderr
@@ -0,0 +1,11 @@
+error: #[project] attribute may not be used on renamed imports
+  --> $DIR/use.rs:12:16
+   |
+12 |     use crate::A as B; //~ ERROR #[project] attribute may not be used on renamed imports
+   |                ^^^^^^
+
+error: #[project] attribute may not be used on glob imports
+  --> $DIR/use.rs:14:16
+   |
+14 |     use crate::*; //~ ERROR #[project] attribute may not be used on glob imports
+   |                ^
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.rs b/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.rs
new file mode 100644
index 0000000000..429d60f044
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.rs
@@ -0,0 +1,14 @@
+use pin_project::pin_project;
+
+#[pin_project(UnsafeUnpin)]
+struct Struct<T, U> {
+    #[pin]
+    inner: T,
+    other: U,
+}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Struct<(), ()>>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.stderr b/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.stderr
new file mode 100644
index 0000000000..0baefe3e1a
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/not-implement-unsafe-unpin.stderr
@@ -0,0 +1,11 @@
+error[E0277]: the trait bound `Struct<(), ()>: pin_project::UnsafeUnpin` is not satisfied
+  --> $DIR/not-implement-unsafe-unpin.rs:13:16
+   |
+10 | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+13 |     is_unpin::<Struct<(), ()>>(); //~ ERROR E0277
+   |                ^^^^^^^^^^^^^^ the trait `pin_project::UnsafeUnpin` is not implemented for `Struct<(), ()>`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, Struct<(), ()>>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Struct<(), ()>`
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.rs b/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.rs
new file mode 100644
index 0000000000..8896bfd2ae
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.rs
@@ -0,0 +1,43 @@
+use pin_project::{pin_project, UnsafeUnpin};
+use std::marker::PhantomPinned;
+
+fn is_unpin<T: Unpin>() {}
+
+#[pin_project(UnsafeUnpin)]
+pub struct Blah<T, U> {
+    field1: U,
+    #[pin]
+    field2: T,
+}
+
+#[allow(unsafe_code)]
+unsafe impl<T: Unpin, U> UnsafeUnpin for Blah<T, U> {}
+
+#[pin_project(UnsafeUnpin)]
+pub struct TrivialBounds {
+    #[pin]
+    field1: PhantomPinned,
+}
+
+#[pin_project(UnsafeUnpin)]
+pub struct OverlappingLifetimeNames<'pin, T, U> {
+    #[pin]
+    field1: U,
+    #[pin]
+    field2: Option<T>,
+    field3: &'pin (),
+}
+
+#[allow(unsafe_code)]
+unsafe impl<T: Unpin, U: Unpin> UnsafeUnpin for OverlappingLifetimeNames<'_, T, U> {}
+
+fn main() {
+    is_unpin::<Blah<PhantomPinned, ()>>(); //~ ERROR E0277
+    is_unpin::<Blah<(), PhantomPinned>>(); // Ok
+    is_unpin::<Blah<PhantomPinned, PhantomPinned>>(); //~ ERROR E0277
+
+    is_unpin::<TrivialBounds>(); //~ ERROR E0277
+
+    is_unpin::<OverlappingLifetimeNames<'_, PhantomPinned, ()>>(); //~ ERROR E0277
+    is_unpin::<OverlappingLifetimeNames<'_, (), PhantomPinned>>(); //~ ERROR E0277
+}
diff --git a/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.stderr b/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.stderr
new file mode 100644
index 0000000000..5494666ecc
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unsafe_unpin/proper_unpin.stderr
@@ -0,0 +1,63 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:35:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+35 |     is_unpin::<Blah<PhantomPinned, ()>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `Blah<std::marker::PhantomPinned, ()>`
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, Blah<std::marker::PhantomPinned, ()>>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Blah<std::marker::PhantomPinned, ()>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:37:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+37 |     is_unpin::<Blah<PhantomPinned, PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `Blah<std::marker::PhantomPinned, std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, Blah<std::marker::PhantomPinned, std::marker::PhantomPinned>>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `Blah<std::marker::PhantomPinned, std::marker::PhantomPinned>`
+
+error[E0277]: the trait bound `TrivialBounds: pin_project::UnsafeUnpin` is not satisfied
+  --> $DIR/proper_unpin.rs:39:16
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+39 |     is_unpin::<TrivialBounds>(); //~ ERROR E0277
+   |                ^^^^^^^^^^^^^ the trait `pin_project::UnsafeUnpin` is not implemented for `TrivialBounds`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, TrivialBounds>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `TrivialBounds`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:41:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+41 |     is_unpin::<OverlappingLifetimeNames<'_, PhantomPinned, ()>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `OverlappingLifetimeNames<'_, std::marker::PhantomPinned, ()>`
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, OverlappingLifetimeNames<'_, std::marker::PhantomPinned, ()>>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `OverlappingLifetimeNames<'_, std::marker::PhantomPinned, ()>`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/proper_unpin.rs:42:5
+   |
+4  | fn is_unpin<T: Unpin>() {}
+   |                ----- required by this bound in `is_unpin`
+...
+42 |     is_unpin::<OverlappingLifetimeNames<'_, (), PhantomPinned>>(); //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `OverlappingLifetimeNames<'_, (), std::marker::PhantomPinned>`
+   = note: required because of the requirements on the impl of `pin_project::UnsafeUnpin` for `pin_project::__private::Wrapper<'_, OverlappingLifetimeNames<'_, (), std::marker::PhantomPinned>>`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `OverlappingLifetimeNames<'_, (), std::marker::PhantomPinned>`
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..b9215b6500
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/README.md
@@ -0,0 +1,5 @@
+# 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..22185eeaf4
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr-feature-gate.rs
@@ -0,0 +1,19 @@
+// NB: If you change this test, change 'marker_trait_attr.rs' at the same time.
+
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project] //~ ERROR E0119
+struct Foo<T> {
+    #[pin]
+    x: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Foo<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<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..da2c8ea695
--- /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 `std::marker::Unpin` for type `Foo<_>`:
+  --> $DIR/marker_trait_attr-feature-gate.rs:6:1
+   |
+6  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Foo<_>`
+...
+13 | impl<T> Unpin for Foo<T> {}
+   | ------------------------ first implementation here
+   |
+   = note: this error originates in a derive macro (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..0b8b30ad64
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/marker_trait_attr.rs
@@ -0,0 +1,25 @@
+// NB: 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 pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project] //~ ERROR E0119
+struct Struct<T> {
+    #[pin]
+    x: 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..9b3ec57ea4
--- /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 `std::marker::Unpin` for type `Struct<_>`:
+  --> $DIR/marker_trait_attr.rs:12:1
+   |
+12 | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+19 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in a derive macro (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-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..0bd4a32cc1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits-feature-gate.rs
@@ -0,0 +1,19 @@
+// NB: If you change this test, change 'overlapping_marker_traits.rs' at the same time.
+
+use pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project] //~ ERROR E0119
+struct Struct<T> {
+    #[pin]
+    x: 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..4a8e23843c
--- /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 `std::marker::Unpin` for type `Struct<_>`:
+  --> $DIR/overlapping_marker_traits-feature-gate.rs:6:1
+   |
+6  | #[pin_project] //~ ERROR E0119
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Struct<_>`
+...
+13 | impl<T> Unpin for Struct<T> {}
+   | --------------------------- first implementation here
+   |
+   = note: this error originates in a derive macro (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..28b23fe394
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/overlapping_marker_traits.rs
@@ -0,0 +1,29 @@
+// NB: 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 pin_project::pin_project;
+use std::marker::PhantomPinned;
+
+#[pin_project]
+struct Foo<T> {
+    #[pin]
+    x: T,
+}
+
+// unsound Unpin impl
+impl<T> Unpin for Foo<T> {}
+
+fn is_unpin<T: Unpin>() {}
+
+fn main() {
+    is_unpin::<Foo<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..13ad810f69
--- /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
+  --> $DIR/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 `std::marker::Unpin` for type `Foo<_>`:
+  --> $DIR/overlapping_marker_traits.rs:16:1
+   |
+16 | #[pin_project]
+   | ^^^^^^^^^^^^^^ conflicting implementation for `Foo<_>`
+...
+23 | impl<T> Unpin for Foo<T> {}
+   | ------------------------ first implementation here
+   |
+   = note: this error originates in a derive macro (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/run-pass/stmt_expr_attributes.rs b/third_party/rust/pin-project/tests/ui/unstable-features/run-pass/stmt_expr_attributes.rs
new file mode 100644
index 0000000000..8ad8e41bb1
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/run-pass/stmt_expr_attributes.rs
@@ -0,0 +1,62 @@
+// NB: If you change this test, change 'stmt_expr_attributes-feature-gate.rs' at the same time.
+
+// proc_macro_hygiene
+// Tracking issue: https://github.com/rust-lang/rust/issues/54727
+#![feature(proc_macro_hygiene)]
+// stmt_expr_attributes
+// Tracking issue: https://github.com/rust-lang/rust/issues/15701
+#![feature(stmt_expr_attributes)]
+
+use pin_project::{pin_project, project};
+use std::pin::Pin;
+
+fn project_stmt_expr_nightly() {
+    #[pin_project]
+    enum Baz<A, B, C, D> {
+        Variant1(#[pin] A, B),
+        Variant2 {
+            #[pin]
+            field1: C,
+            field2: D,
+        },
+        None,
+    }
+
+    let mut baz = Baz::Variant1(1, 2);
+
+    let mut baz = Pin::new(&mut baz).project();
+
+    #[project]
+    match &mut baz {
+        Baz::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Baz::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        Baz::None => {}
+    }
+
+    let () = #[project]
+    match &mut baz {
+        Baz::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Baz::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        Baz::None => {}
+    };
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.rs b/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.rs
new file mode 100644
index 0000000000..82267238f4
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.rs
@@ -0,0 +1,55 @@
+// NB: If you change this test, change 'stmt_expr_attributes.rs' at the same time.
+
+use pin_project::{pin_project, project};
+use std::pin::Pin;
+
+fn project_stmt_expr_nightly() {
+    #[pin_project]
+    enum Enum<A, B, C, D> {
+        Variant1(#[pin] A, B),
+        Variant2 {
+            #[pin]
+            field1: C,
+            field2: D,
+        },
+        None,
+    }
+
+    let mut baz = Enum::Variant1(1, 2);
+
+    let mut baz = Pin::new(&mut baz).project();
+
+    #[project] //~ ERROR E0658
+    match &mut baz {
+        Enum::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Enum::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        Enum::None => {}
+    }
+
+    let () = #[project] //~ ERROR E0658
+    match &mut baz {
+        Enum::Variant1(x, y) => {
+            let x: &mut Pin<&mut i32> = x;
+            assert_eq!(**x, 1);
+
+            let y: &mut &mut i32 = y;
+            assert_eq!(**y, 2);
+        }
+        Enum::Variant2 { field1, field2 } => {
+            let _x: &mut Pin<&mut i32> = field1;
+            let _y: &mut &mut i32 = field2;
+        }
+        Enum::None => {}
+    };
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.stderr
new file mode 100644
index 0000000000..6510ec760b
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/stmt_expr_attributes-feature-gate.stderr
@@ -0,0 +1,35 @@
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/stmt_expr_attributes-feature-gate.rs:22:5
+   |
+22 |     #[project] //~ ERROR E0658
+   |     ^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
+error[E0658]: attributes on expressions are experimental
+  --> $DIR/stmt_expr_attributes-feature-gate.rs:38:14
+   |
+38 |     let () = #[project] //~ ERROR E0658
+   |              ^^^^^^^^^^
+   |
+   = note: see issue #15701 <https://github.com/rust-lang/rust/issues/15701> for more information
+   = help: add `#![feature(stmt_expr_attributes)]` to the crate attributes to enable
+
+error[E0658]: custom attributes cannot be applied to expressions
+  --> $DIR/stmt_expr_attributes-feature-gate.rs:22:5
+   |
+22 |     #[project] //~ ERROR E0658
+   |     ^^^^^^^^^^
+   |
+   = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+   = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
+
+error[E0658]: custom attributes cannot be applied to expressions
+  --> $DIR/stmt_expr_attributes-feature-gate.rs:38:14
+   |
+38 |     let () = #[project] //~ ERROR E0658
+   |              ^^^^^^^^^^
+   |
+   = note: see issue #54727 <https://github.com/rust-lang/rust/issues/54727> for more information
+   = help: add `#![feature(proc_macro_hygiene)]` to the crate attributes to enable
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.rs b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.rs
new file mode 100644
index 0000000000..66e0ec4a4f
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.rs
@@ -0,0 +1,33 @@
+// NB: 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)]
+
+use std::marker::{PhantomData, PhantomPinned};
+
+fn phantom_pinned() {
+    struct A(PhantomPinned);
+
+    // bug of trivial_bounds?
+    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 {} //~ Ok
+
+    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
+}
+
+fn main() {}
diff --git a/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.stderr
new file mode 100644
index 0000000000..8370c456cc
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-bug.stderr
@@ -0,0 +1,5 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+   --> $DIR/trivial_bounds-bug.rs:13:43
+    |
+13  |     impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR E0277
+    |                                           ^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
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..a6a4d84e61
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.rs
@@ -0,0 +1,52 @@
+// NB: If you change this test, change 'trivial_bounds.rs' at the same time.
+
+use std::marker::{PhantomData, PhantomPinned};
+
+fn phantom_pinned() {
+    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
+}
+
+fn inner() {
+    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..f8ef886065
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds-feature-gate.stderr
@@ -0,0 +1,45 @@
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+ --> $DIR/trivial_bounds-feature-gate.rs:8:5
+  |
+8 |     impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR E0277
+  |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+  |
+  = help: see issue #48214
+  = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+   --> $DIR/trivial_bounds-feature-gate.rs:8:43
+    |
+8   |     impl Unpin for A where PhantomPinned: Unpin {} //~ ERROR E0277
+    |                                           ^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/trivial_bounds-feature-gate.rs:16:5
+   |
+16 |     impl Unpin for B where Wrapper<PhantomPinned>: Unpin {} //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `phantom_pinned::Wrapper<std::marker::PhantomPinned>`
+   = help: see issue #48214
+   = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/trivial_bounds-feature-gate.rs:33:5
+   |
+33 |     impl Unpin for A where Inner: Unpin {} //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `inner::Inner`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `inner::Inner`
+   = help: see issue #48214
+   = help: add `#![feature(trivial_bounds)]` to the crate attributes to enable
+
+error[E0277]: `std::marker::PhantomPinned` cannot be unpinned
+  --> $DIR/trivial_bounds-feature-gate.rs:41:5
+   |
+41 |     impl Unpin for B where Wrapper<Inner>: Unpin {} //~ ERROR E0277
+   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ within `inner::Inner`, the trait `std::marker::Unpin` is not implemented for `std::marker::PhantomPinned`
+   |
+   = note: required because it appears within the type `inner::Inner`
+   = note: required because of the requirements on the impl of `std::marker::Unpin` for `inner::Wrapper<inner::Inner>`
+   = 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..680effe61d
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.rs
@@ -0,0 +1,34 @@
+// NB: 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)]
+
+use std::marker::{PhantomData, PhantomPinned};
+
+fn inner() {
+    struct Inner(PhantomPinned);
+
+    struct A(Inner);
+
+    impl Unpin for A where Inner: Unpin {} //~ ERROR std::marker::Unpin does not depend on any type or lifetime parameters
+
+    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 std::marker::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 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.stderr b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.stderr
new file mode 100644
index 0000000000..03d0161443
--- /dev/null
+++ b/third_party/rust/pin-project/tests/ui/unstable-features/trivial_bounds.stderr
@@ -0,0 +1,17 @@
+error: Trait bound inner::Inner: std::marker::Unpin does not depend on any type or lifetime parameters
+  --> $DIR/trivial_bounds.rs:15:35
+   |
+15 |     impl Unpin for A where Inner: Unpin {} //~ ERROR std::marker::Unpin does not depend on any type or lifetime parameters
+   |                                   ^^^^^
+   |
+note: the lint level is defined here
+  --> $DIR/trivial_bounds.rs:6:9
+   |
+6  | #![deny(trivial_bounds)]
+   |         ^^^^^^^^^^^^^^
+
+error: Trait bound inner::Wrapper<inner::Inner>: std::marker::Unpin does not depend on any type or lifetime parameters
+  --> $DIR/trivial_bounds.rs:23:44
+   |
+23 |     impl Unpin for B where Wrapper<Inner>: Unpin {} //~ ERROR std::marker::Unpin does not depend on any type or lifetime parameters
+   |                                            ^^^^^