13 files changed, 541 insertions, 0 deletions
diff --git a/tests/trybuild.rs b/tests/trybuild.rs
new file mode 100644
index 0000000..4ed01f7
--- /dev/null
+++ b/tests/trybuild.rs
@@ -0,0 +1,45 @@
+// Copyright 2019 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// UI tests depend on the exact error messages emitted by rustc, but those error
+// messages are not stable, and sometimes change between Rust versions. Thus, we
+// maintain one set of UI tests for each Rust version that we test in CI, and we
+// pin to specific versions in CI (a specific stable version, a specific date of
+// the nightly compiler, and a specific MSRV). Updating those pinned versions
+// may also require updating these tests.
+// - `tests/ui-nightly` - Contains the source of truth for our UI test source
+//   files (`.rs`), and contains `.err` and `.out` files for nightly
+// - `tests/ui-stable` - Contains symlinks to the `.rs` files in
+//   `tests/ui-nightly`, and contains `.err` and `.out` files for stable
+// - `tests/ui-msrv` - Contains symlinks to the `.rs` files in
+//   `tests/ui-nightly`, and contains `.err` and `.out` files for MSRV
+
+#[rustversion::nightly]
+const SOURCE_FILES_DIR: &str = "tests/ui-nightly";
+#[rustversion::stable(1.69.0)]
+const SOURCE_FILES_DIR: &str = "tests/ui-stable";
+#[rustversion::stable(1.61.0)]
+const SOURCE_FILES_DIR: &str = "tests/ui-msrv";
+
+const SOURCE_FILES_DIR: &str = "tests/ui-stable";
+
+#[test]
+fn ui() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail(format!("{SOURCE_FILES_DIR}/*.rs"));
+}
+
+// The file `invalid-impls.rs` directly includes `src/macros.rs` in order to
+// test the `impl_or_verify!` macro which is defined in that file. Specifically,
+// it tests the verification portion of that macro, which is enabled when
+// `cfg(any(feature = "derive", test))`. While `--cfg test` is of course passed
+// to the code in the file you're reading right now, `trybuild` does not pass
+// `--cfg test` when it invokes Cargo. As a result, this `trybuild` test only
+// tests the correct behavior when the "derive" feature is enabled.
+#[cfg(feature = "derive")]
+#[test]
+fn ui_invalid_impls() {
+    let t = trybuild::TestCases::new();
+    t.compile_fail(format!("{SOURCE_FILES_DIR}/invalid-impls/*.rs"));
+}
diff --git a/tests/ui-msrv/invalid-impls/invalid-impls.rs b/tests/ui-msrv/invalid-impls/invalid-impls.rs
new file mode 100644
index 0000000..b9a60bd
--- /dev/null
+++ b/tests/ui-msrv/invalid-impls/invalid-impls.rs
@@ -0,0 +1,25 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Since some macros from `macros.rs` are unused.
+#![allow(unused)]
+
+extern crate zerocopy;
+extern crate zerocopy_derive;
+
+include!("../../../src/macros.rs");
+
+use zerocopy::*;
+use zerocopy_derive::*;
+
+fn main() {}
+
+#[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+#[repr(transparent)]
+struct Foo<T>(T);
+
+impl_or_verify!(T => FromZeroes for Foo<T>);
+impl_or_verify!(T => FromBytes for Foo<T>);
+impl_or_verify!(T => AsBytes for Foo<T>);
+impl_or_verify!(T => Unaligned for Foo<T>);
diff --git a/tests/ui-msrv/invalid-impls/invalid-impls.stderr b/tests/ui-msrv/invalid-impls/invalid-impls.stderr
new file mode 100644
index 0000000..fee0cd9
--- /dev/null
+++ b/tests/ui-msrv/invalid-impls/invalid-impls.stderr
@@ -0,0 +1,127 @@
+error[E0277]: the trait bound `T: zerocopy::FromZeroes` is not satisfied
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             impl<$($tyvar $(: $(? $optbound +)* $($bound +)*)?),*> Subtrait for $ty {}
+   |                                                                    ^^^^^^^^ the trait `zerocopy::FromZeroes` is not implemented for `T`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:22:1
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   | ------------------------------------------- in this macro invocation
+   |
+note: required because of the requirements on the impl of `zerocopy::FromZeroes` for `Foo<T>`
+  --> tests/ui-msrv/invalid-impls/invalid-impls.rs:18:10
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |          ^^^^^^^^^^
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `_::Subtrait`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:22:1
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   | ------------------------------------------- in this macro invocation
+   = note: this error originates in the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+22  | impl_or_verify!(T: zerocopy::FromZeroes => FromZeroes for Foo<T>);
+    |                  ++++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::FromBytes` is not satisfied
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             impl<$($tyvar $(: $(? $optbound +)* $($bound +)*)?),*> Subtrait for $ty {}
+   |                                                                    ^^^^^^^^ the trait `zerocopy::FromBytes` is not implemented for `T`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:23:1
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   |
+note: required because of the requirements on the impl of `zerocopy::FromBytes` for `Foo<T>`
+  --> tests/ui-msrv/invalid-impls/invalid-impls.rs:18:22
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                      ^^^^^^^^^
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `_::Subtrait`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:23:1
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+23  | impl_or_verify!(T: zerocopy::FromBytes => FromBytes for Foo<T>);
+    |                  +++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::AsBytes` is not satisfied
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             impl<$($tyvar $(: $(? $optbound +)* $($bound +)*)?),*> Subtrait for $ty {}
+   |                                                                    ^^^^^^^^ the trait `zerocopy::AsBytes` is not implemented for `T`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:24:1
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   | ---------------------------------------- in this macro invocation
+   |
+note: required because of the requirements on the impl of `zerocopy::AsBytes` for `Foo<T>`
+  --> tests/ui-msrv/invalid-impls/invalid-impls.rs:18:33
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                 ^^^^^^^
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `_::Subtrait`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:24:1
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   | ---------------------------------------- in this macro invocation
+   = note: this error originates in the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+24  | impl_or_verify!(T: zerocopy::AsBytes => AsBytes for Foo<T>);
+    |                  +++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::Unaligned` is not satisfied
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             impl<$($tyvar $(: $(? $optbound +)* $($bound +)*)?),*> Subtrait for $ty {}
+   |                                                                    ^^^^^^^^ the trait `zerocopy::Unaligned` is not implemented for `T`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:25:1
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   |
+note: required because of the requirements on the impl of `zerocopy::Unaligned` for `Foo<T>`
+  --> tests/ui-msrv/invalid-impls/invalid-impls.rs:18:42
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                          ^^^^^^^^^
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-msrv/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `_::Subtrait`
+   |
+  ::: tests/ui-msrv/invalid-impls/invalid-impls.rs:25:1
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+25  | impl_or_verify!(T: zerocopy::Unaligned => Unaligned for Foo<T>);
+    |                  +++++++++++++++++++++
diff --git a/tests/ui-msrv/transmute-illegal.rs b/tests/ui-msrv/transmute-illegal.rs
new file mode 100644
index 0000000..74b8439
--- /dev/null
+++ b/tests/ui-msrv/transmute-illegal.rs
@@ -0,0 +1,10 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+extern crate zerocopy;
+
+fn main() {}
+
+// It is unsound to inspect the usize value of a pointer during const eval.
+const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
diff --git a/tests/ui-msrv/transmute-illegal.stderr b/tests/ui-msrv/transmute-illegal.stderr
new file mode 100644
index 0000000..37c124a
--- /dev/null
+++ b/tests/ui-msrv/transmute-illegal.stderr
@@ -0,0 +1,18 @@
+error[E0277]: the trait bound `*const usize: AsBytes` is not satisfied
+  --> tests/ui-msrv/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `AsBytes` is not implemented for `*const usize`
+   |
+   = help: the following implementations were found:
+             <usize as AsBytes>
+             <f32 as AsBytes>
+             <f64 as AsBytes>
+             <i128 as AsBytes>
+           and $N others
+note: required by a bound in `POINTER_VALUE::transmute`
+  --> tests/ui-msrv/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `POINTER_VALUE::transmute`
+   = note: this error originates in the macro `zerocopy::transmute` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/tests/ui-nightly/invalid-impls/invalid-impls.rs b/tests/ui-nightly/invalid-impls/invalid-impls.rs
new file mode 100644
index 0000000..b9a60bd
--- /dev/null
+++ b/tests/ui-nightly/invalid-impls/invalid-impls.rs
@@ -0,0 +1,25 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Since some macros from `macros.rs` are unused.
+#![allow(unused)]
+
+extern crate zerocopy;
+extern crate zerocopy_derive;
+
+include!("../../../src/macros.rs");
+
+use zerocopy::*;
+use zerocopy_derive::*;
+
+fn main() {}
+
+#[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+#[repr(transparent)]
+struct Foo<T>(T);
+
+impl_or_verify!(T => FromZeroes for Foo<T>);
+impl_or_verify!(T => FromBytes for Foo<T>);
+impl_or_verify!(T => AsBytes for Foo<T>);
+impl_or_verify!(T => Unaligned for Foo<T>);
diff --git a/tests/ui-nightly/invalid-impls/invalid-impls.stderr b/tests/ui-nightly/invalid-impls/invalid-impls.stderr
new file mode 100644
index 0000000..7d839ac
--- /dev/null
+++ b/tests/ui-nightly/invalid-impls/invalid-impls.stderr
@@ -0,0 +1,107 @@
+error[E0277]: the trait bound `T: zerocopy::FromZeroes` is not satisfied
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:22:37
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   |                                     ^^^^^^ the trait `zerocopy::FromZeroes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::FromZeroes`
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:18:10
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |          ^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-nightly/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-nightly/invalid-impls/invalid-impls.rs:22:1
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   | ------------------------------------------- in this macro invocation
+   = note: this error originates in the derive macro `FromZeroes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+22  | impl_or_verify!(T: zerocopy::FromZeroes => FromZeroes for Foo<T>);
+    |                  ++++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::FromBytes` is not satisfied
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:23:36
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   |                                    ^^^^^^ the trait `zerocopy::FromBytes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::FromBytes`
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:18:22
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                      ^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-nightly/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-nightly/invalid-impls/invalid-impls.rs:23:1
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the derive macro `FromBytes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+23  | impl_or_verify!(T: zerocopy::FromBytes => FromBytes for Foo<T>);
+    |                  +++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::AsBytes` is not satisfied
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:24:34
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   |                                  ^^^^^^ the trait `zerocopy::AsBytes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::AsBytes`
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:18:33
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                 ^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-nightly/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-nightly/invalid-impls/invalid-impls.rs:24:1
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   | ---------------------------------------- in this macro invocation
+   = note: this error originates in the derive macro `AsBytes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+24  | impl_or_verify!(T: zerocopy::AsBytes => AsBytes for Foo<T>);
+    |                  +++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::Unaligned` is not satisfied
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:25:36
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   |                                    ^^^^^^ the trait `zerocopy::Unaligned` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::Unaligned`
+  --> tests/ui-nightly/invalid-impls/invalid-impls.rs:18:42
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                          ^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-nightly/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-nightly/invalid-impls/invalid-impls.rs:25:1
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the derive macro `Unaligned` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+25  | impl_or_verify!(T: zerocopy::Unaligned => Unaligned for Foo<T>);
+    |                  +++++++++++++++++++++
diff --git a/tests/ui-nightly/transmute-illegal.rs b/tests/ui-nightly/transmute-illegal.rs
new file mode 100644
index 0000000..74b8439
--- /dev/null
+++ b/tests/ui-nightly/transmute-illegal.rs
@@ -0,0 +1,10 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+extern crate zerocopy;
+
+fn main() {}
+
+// It is unsound to inspect the usize value of a pointer during const eval.
+const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
diff --git a/tests/ui-nightly/transmute-illegal.stderr b/tests/ui-nightly/transmute-illegal.stderr
new file mode 100644
index 0000000..a57544b
--- /dev/null
+++ b/tests/ui-nightly/transmute-illegal.stderr
@@ -0,0 +1,16 @@
+error[E0277]: the trait bound `*const usize: AsBytes` is not satisfied
+  --> tests/ui-nightly/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                              |
+   |                              the trait `AsBytes` is not implemented for `*const usize`
+   |                              required by a bound introduced by this call
+   |
+   = help: the trait `AsBytes` is implemented for `usize`
+note: required by a bound in `POINTER_VALUE::transmute`
+  --> tests/ui-nightly/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `transmute`
+   = note: this error originates in the macro `zerocopy::transmute` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/tests/ui-stable/invalid-impls/invalid-impls.rs b/tests/ui-stable/invalid-impls/invalid-impls.rs
new file mode 100644
index 0000000..b9a60bd
--- /dev/null
+++ b/tests/ui-stable/invalid-impls/invalid-impls.rs
@@ -0,0 +1,25 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+// Since some macros from `macros.rs` are unused.
+#![allow(unused)]
+
+extern crate zerocopy;
+extern crate zerocopy_derive;
+
+include!("../../../src/macros.rs");
+
+use zerocopy::*;
+use zerocopy_derive::*;
+
+fn main() {}
+
+#[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+#[repr(transparent)]
+struct Foo<T>(T);
+
+impl_or_verify!(T => FromZeroes for Foo<T>);
+impl_or_verify!(T => FromBytes for Foo<T>);
+impl_or_verify!(T => AsBytes for Foo<T>);
+impl_or_verify!(T => Unaligned for Foo<T>);
diff --git a/tests/ui-stable/invalid-impls/invalid-impls.stderr b/tests/ui-stable/invalid-impls/invalid-impls.stderr
new file mode 100644
index 0000000..f613377
--- /dev/null
+++ b/tests/ui-stable/invalid-impls/invalid-impls.stderr
@@ -0,0 +1,107 @@
+error[E0277]: the trait bound `T: zerocopy::FromZeroes` is not satisfied
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:22:37
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   |                                     ^^^^^^ the trait `zerocopy::FromZeroes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::FromZeroes`
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:18:10
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |          ^^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-stable/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-stable/invalid-impls/invalid-impls.rs:22:1
+   |
+22 | impl_or_verify!(T => FromZeroes for Foo<T>);
+   | ------------------------------------------- in this macro invocation
+   = note: this error originates in the derive macro `FromZeroes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+22  | impl_or_verify!(T: zerocopy::FromZeroes => FromZeroes for Foo<T>);
+    |                  ++++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::FromBytes` is not satisfied
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:23:36
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   |                                    ^^^^^^ the trait `zerocopy::FromBytes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::FromBytes`
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:18:22
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                      ^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-stable/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-stable/invalid-impls/invalid-impls.rs:23:1
+   |
+23 | impl_or_verify!(T => FromBytes for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the derive macro `FromBytes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+23  | impl_or_verify!(T: zerocopy::FromBytes => FromBytes for Foo<T>);
+    |                  +++++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::AsBytes` is not satisfied
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:24:34
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   |                                  ^^^^^^ the trait `zerocopy::AsBytes` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::AsBytes`
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:18:33
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                 ^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-stable/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-stable/invalid-impls/invalid-impls.rs:24:1
+   |
+24 | impl_or_verify!(T => AsBytes for Foo<T>);
+   | ---------------------------------------- in this macro invocation
+   = note: this error originates in the derive macro `AsBytes` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+24  | impl_or_verify!(T: zerocopy::AsBytes => AsBytes for Foo<T>);
+    |                  +++++++++++++++++++
+
+error[E0277]: the trait bound `T: zerocopy::Unaligned` is not satisfied
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:25:36
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   |                                    ^^^^^^ the trait `zerocopy::Unaligned` is not implemented for `T`
+   |
+note: required for `Foo<T>` to implement `zerocopy::Unaligned`
+  --> tests/ui-stable/invalid-impls/invalid-impls.rs:18:42
+   |
+18 | #[derive(FromZeroes, FromBytes, AsBytes, Unaligned)]
+   |                                          ^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
+note: required by a bound in `_::Subtrait`
+  --> tests/ui-stable/invalid-impls/../../../src/macros.rs
+   |
+   |             trait Subtrait: $trait {}
+   |                             ^^^^^^ required by this bound in `Subtrait`
+   |
+  ::: tests/ui-stable/invalid-impls/invalid-impls.rs:25:1
+   |
+25 | impl_or_verify!(T => Unaligned for Foo<T>);
+   | ------------------------------------------ in this macro invocation
+   = note: this error originates in the derive macro `Unaligned` which comes from the expansion of the macro `impl_or_verify` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: consider restricting type parameter `T`
+    |
+25  | impl_or_verify!(T: zerocopy::Unaligned => Unaligned for Foo<T>);
+    |                  +++++++++++++++++++++
diff --git a/tests/ui-stable/transmute-illegal.rs b/tests/ui-stable/transmute-illegal.rs
new file mode 100644
index 0000000..74b8439
--- /dev/null
+++ b/tests/ui-stable/transmute-illegal.rs
@@ -0,0 +1,10 @@
+// Copyright 2022 The Fuchsia Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+extern crate zerocopy;
+
+fn main() {}
+
+// It is unsound to inspect the usize value of a pointer during const eval.
+const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
diff --git a/tests/ui-stable/transmute-illegal.stderr b/tests/ui-stable/transmute-illegal.stderr
new file mode 100644
index 0000000..e9ac240
--- /dev/null
+++ b/tests/ui-stable/transmute-illegal.stderr
@@ -0,0 +1,16 @@
+error[E0277]: the trait bound `*const usize: AsBytes` is not satisfied
+  --> tests/ui-stable/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+   |                              |
+   |                              the trait `AsBytes` is not implemented for `*const usize`
+   |                              required by a bound introduced by this call
+   |
+   = help: the trait `AsBytes` is implemented for `usize`
+note: required by a bound in `POINTER_VALUE::transmute`
+  --> tests/ui-stable/transmute-illegal.rs:10:30
+   |
+10 | const POINTER_VALUE: usize = zerocopy::transmute!(&0usize as *const usize);
+   |                              ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `transmute`
+   = note: this error originates in the macro `zerocopy::transmute` (in Nightly builds, run with -Z macro-backtrace for more info)