google · joshlf · Jan 28, 2025 · Jan 10, 2025
diff --git a/.github/workflows/ci.yml b/.github/workflows/ci.yml
@@ -102,6 +102,10 @@ jobs:
             toolchain: "zerocopy-core-error"
           - crate: "zerocopy-derive"
             toolchain: "zerocopy-diagnostic-on-unimplemented"
+          # Exclude stable/wasm since wasm is no longer provided via rustup on
+          # stable.
+          - toolchain: "stable"
+            target: "wasm32-wasi"
           # Exclude most targets targets from the `zerocopy-core-error`
           # toolchain since the `zerocopy-core-error` feature is unrelated to
           # compilation target. This only leaves i686 and x86_64 targets.

diff --git a/Cargo.toml b/Cargo.toml
@@ -46,7 +46,7 @@ zerocopy-diagnostic-on-unimplemented = "1.78.0"
 
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
-pinned-stable = "1.83.0"
+pinned-stable = "1.84.0"
 pinned-nightly = "nightly-2024-11-06"
 
 [package.metadata.docs.rs]

diff --git a/tests/ui-stable/invalid-impls/invalid-impls.stderr b/tests/ui-stable/invalid-impls/invalid-impls.stderr
@@ -2,7 +2,7 @@ error[E0277]: the trait bound `T: zerocopy::TryFromBytes` is not satisfied
   --> tests/ui-stable/invalid-impls/invalid-impls.rs:26:39
    |
 26 | impl_or_verify!(T => TryFromBytes for Foo<T>);
-   |                                       ^^^^^^ the trait `zerocopy::TryFromBytes` is not implemented for `T`, which is required by `Foo<T>: zerocopy::TryFromBytes`
+   |                                       ^^^^^^ the trait `zerocopy::TryFromBytes` is not implemented for `T`
    |
    = note: Consider adding `#[derive(TryFromBytes)]` to `T`
 note: required for `Foo<T>` to implement `zerocopy::TryFromBytes`
@@ -30,7 +30,7 @@ error[E0277]: the trait bound `T: zerocopy::FromZeros` is not satisfied
   --> tests/ui-stable/invalid-impls/invalid-impls.rs:27:36
    |
 27 | impl_or_verify!(T => FromZeros for Foo<T>);
-   |                                    ^^^^^^ the trait `zerocopy::FromZeros` is not implemented for `T`, which is required by `Foo<T>: zerocopy::FromZeros`
+   |                                    ^^^^^^ the trait `zerocopy::FromZeros` is not implemented for `T`
    |
    = note: Consider adding `#[derive(FromZeros)]` to `T`
 note: required for `Foo<T>` to implement `zerocopy::FromZeros`
@@ -58,7 +58,7 @@ error[E0277]: the trait bound `T: zerocopy::FromBytes` is not satisfied
   --> tests/ui-stable/invalid-impls/invalid-impls.rs:28:36
    |
 28 | impl_or_verify!(T => FromBytes for Foo<T>);
-   |                                    ^^^^^^ the trait `zerocopy::FromBytes` is not implemented for `T`, which is required by `Foo<T>: zerocopy::FromBytes`
+   |                                    ^^^^^^ the trait `zerocopy::FromBytes` is not implemented for `T`
    |
    = note: Consider adding `#[derive(FromBytes)]` to `T`
 note: required for `Foo<T>` to implement `zerocopy::FromBytes`
@@ -86,7 +86,7 @@ error[E0277]: the trait bound `T: zerocopy::IntoBytes` is not satisfied
   --> tests/ui-stable/invalid-impls/invalid-impls.rs:29:36
    |
 29 | impl_or_verify!(T => IntoBytes for Foo<T>);
-   |                                    ^^^^^^ the trait `zerocopy::IntoBytes` is not implemented for `T`, which is required by `Foo<T>: zerocopy::IntoBytes`
+   |                                    ^^^^^^ the trait `zerocopy::IntoBytes` is not implemented for `T`
    |
    = note: Consider adding `#[derive(IntoBytes)]` to `T`
 note: required for `Foo<T>` to implement `zerocopy::IntoBytes`
@@ -114,7 +114,7 @@ error[E0277]: the trait bound `T: zerocopy::Unaligned` is not satisfied
   --> tests/ui-stable/invalid-impls/invalid-impls.rs:30:36
    |
 30 | impl_or_verify!(T => Unaligned for Foo<T>);
-   |                                    ^^^^^^ the trait `zerocopy::Unaligned` is not implemented for `T`, which is required by `Foo<T>: zerocopy::Unaligned`
+   |                                    ^^^^^^ the trait `zerocopy::Unaligned` is not implemented for `T`
    |
    = note: Consider adding `#[derive(Unaligned)]` to `T`
 note: required for `Foo<T>` to implement `zerocopy::Unaligned`

diff --git a/tests/ui-stable/transmute-mut-dst-unsized.stderr b/tests/ui-stable/transmute-mut-dst-unsized.stderr
@@ -48,10 +48,10 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |
    = help: the trait `Sized` is not implemented for `[u8]`
 note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
-  --> $RUST/core/src/intrinsics.rs
+  --> $RUST/core/src/intrinsics/mod.rs
    |
-   |     pub fn transmute<Src, Dst>(src: Src) -> Dst;
-   |                           ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
+   | pub const unsafe fn transmute<Src, Dst>(_src: Src) -> Dst {
+   |                                    ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
    = note: this error originates in the macro `$crate::assert_size_eq` which comes from the expansion of the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time

diff --git a/tests/ui-stable/transmute-mut-src-dst-not-references.stderr b/tests/ui-stable/transmute-mut-src-dst-not-references.stderr
@@ -20,7 +20,7 @@ warning: this function depends on never type fallback being `()`
 17 | const SRC_DST_NOT_REFERENCES: &mut usize = transmute_mut!(0usize);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the types explicitly
 note: in edition 2024, the requirement `!: FromBytes` will fail
@@ -30,14 +30,19 @@ note: in edition 2024, the requirement `!: FromBytes` will fail
    |                                            ^^^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
    = note: this warning originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use `()` annotations to avoid fallback changes
+  --> src/macros.rs
+   |
+   |         let e: &mut () = $e;
+   |                     ~~
 
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-dst-not-references.rs:17:44
    |
 17 | const SRC_DST_NOT_REFERENCES: &mut usize = transmute_mut!(0usize);
    |                                            ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: `#[warn(never_type_fallback_flowing_into_unsafe)]` on by default

diff --git a/tests/ui-stable/transmute-mut-src-dst-unsized.stderr b/tests/ui-stable/transmute-mut-src-dst-unsized.stderr
@@ -145,10 +145,10 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |
    = help: the trait `Sized` is not implemented for `[u8]`
 note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
-  --> $RUST/core/src/intrinsics.rs
+  --> $RUST/core/src/intrinsics/mod.rs
    |
-   |     pub fn transmute<Src, Dst>(src: Src) -> Dst;
-   |                           ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
+   | pub const unsafe fn transmute<Src, Dst>(_src: Src) -> Dst {
+   |                                    ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
    = note: this error originates in the macro `$crate::assert_size_eq` which comes from the expansion of the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time

diff --git a/tests/ui-stable/transmute-mut-src-immutable.stderr b/tests/ui-stable/transmute-mut-src-immutable.stderr
@@ -16,7 +16,7 @@ warning: this function depends on never type fallback being `()`
 15 | fn ref_src_immutable() {
    | ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the types explicitly
 note: in edition 2024, the requirement `!: FromBytes` will fail
@@ -26,14 +26,19 @@ note: in edition 2024, the requirement `!: FromBytes` will fail
    |                      ^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
    = note: this warning originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use `()` annotations to avoid fallback changes
+  --> src/macros.rs
+   |
+   |         let e: &mut () = $e;
+   |                     ~~
 
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-immutable.rs:17:22
    |
 17 |     let _: &mut u8 = transmute_mut!(&0u8);
    |                      ^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: `#[warn(never_type_fallback_flowing_into_unsafe)]` on by default

diff --git a/tests/ui-stable/transmute-mut-src-not-a-reference.stderr b/tests/ui-stable/transmute-mut-src-not-a-reference.stderr
@@ -20,7 +20,7 @@ warning: this function depends on never type fallback being `()`
 17 | const SRC_NOT_A_REFERENCE: &mut u8 = transmute_mut!(0usize);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the types explicitly
 note: in edition 2024, the requirement `!: FromBytes` will fail
@@ -30,14 +30,19 @@ note: in edition 2024, the requirement `!: FromBytes` will fail
    |                                      ^^^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
    = note: this warning originates in the macro `transmute_mut` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use `()` annotations to avoid fallback changes
+  --> src/macros.rs
+   |
+   |         let e: &mut () = $e;
+   |                     ~~
 
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-not-a-reference.rs:17:38
    |
 17 | const SRC_NOT_A_REFERENCE: &mut u8 = transmute_mut!(0usize);
    |                                      ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: `#[warn(never_type_fallback_flowing_into_unsafe)]` on by default

diff --git a/tests/ui-stable/transmute-ref-dst-unsized.stderr b/tests/ui-stable/transmute-ref-dst-unsized.stderr
@@ -48,10 +48,10 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |
    = help: the trait `Sized` is not implemented for `[u8]`
 note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
-  --> $RUST/core/src/intrinsics.rs
+  --> $RUST/core/src/intrinsics/mod.rs
    |
-   |     pub fn transmute<Src, Dst>(src: Src) -> Dst;
-   |                           ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
+   | pub const unsafe fn transmute<Src, Dst>(_src: Src) -> Dst {
+   |                                    ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
    = note: this error originates in the macro `$crate::assert_size_eq` which comes from the expansion of the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time

diff --git a/tests/ui-stable/transmute-ref-src-dst-not-references.stderr b/tests/ui-stable/transmute-ref-src-dst-not-references.stderr
@@ -83,7 +83,7 @@ warning: this function depends on never type fallback being `()`
 17 | const SRC_DST_NOT_REFERENCES: usize = transmute_ref!(0usize);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the types explicitly
 note: in edition 2024, the requirement `!: IntoBytes` will fail
@@ -93,14 +93,19 @@ note: in edition 2024, the requirement `!: IntoBytes` will fail
    |                                       ^^^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
    = note: this warning originates in the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use `()` annotations to avoid fallback changes
+  --> src/macros.rs
+   |
+   |         let e: &() = $e;
+   |                 ~~
 
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-ref-src-dst-not-references.rs:17:39
    |
 17 | const SRC_DST_NOT_REFERENCES: usize = transmute_ref!(0usize);
    |                                       ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: `#[warn(never_type_fallback_flowing_into_unsafe)]` on by default
@@ -112,7 +117,7 @@ warning: never type fallback affects this call to an `unsafe` function
 17 | const SRC_DST_NOT_REFERENCES: usize = transmute_ref!(0usize);
    |                                       ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: this warning originates in the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
diff --git a/tests/ui-stable/transmute-ref-src-dst-unsized.stderr b/tests/ui-stable/transmute-ref-src-dst-unsized.stderr
@@ -145,10 +145,10 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |
    = help: the trait `Sized` is not implemented for `[u8]`
 note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
-  --> $RUST/core/src/intrinsics.rs
+  --> $RUST/core/src/intrinsics/mod.rs
    |
-   |     pub fn transmute<Src, Dst>(src: Src) -> Dst;
-   |                           ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
+   | pub const unsafe fn transmute<Src, Dst>(_src: Src) -> Dst {
+   |                                    ^^^ required by the implicit `Sized` requirement on this type parameter in `transmute`
    = note: this error originates in the macro `$crate::assert_size_eq` which comes from the expansion of the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
 
 error[E0277]: the size for values of type `[u8]` cannot be known at compilation time

diff --git a/tests/ui-stable/transmute-ref-src-not-a-reference.stderr b/tests/ui-stable/transmute-ref-src-not-a-reference.stderr
@@ -20,7 +20,7 @@ warning: this function depends on never type fallback being `()`
 17 | const SRC_NOT_A_REFERENCE: &u8 = transmute_ref!(0usize);
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in a future release!
+   = warning: this was previously accepted by the compiler but is being phased out; it will become a hard error in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the types explicitly
 note: in edition 2024, the requirement `!: IntoBytes` will fail
@@ -30,14 +30,19 @@ note: in edition 2024, the requirement `!: IntoBytes` will fail
    |                                  ^^^^^^^^^^^^^^^^^^^^^^
    = note: `#[warn(dependency_on_unit_never_type_fallback)]` on by default
    = note: this warning originates in the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
+help: use `()` annotations to avoid fallback changes
+  --> src/macros.rs
+   |
+   |         let e: &() = $e;
+   |                 ~~
 
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-ref-src-not-a-reference.rs:17:34
    |
 17 | const SRC_NOT_A_REFERENCE: &u8 = transmute_ref!(0usize);
    |                                  ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: `#[warn(never_type_fallback_flowing_into_unsafe)]` on by default
@@ -49,7 +54,7 @@ warning: never type fallback affects this call to an `unsafe` function
 17 | const SRC_NOT_A_REFERENCE: &u8 = transmute_ref!(0usize);
    |                                  ^^^^^^^^^^^^^^^^^^^^^^
    |
-   = warning: this will change its meaning in a future release!
+   = warning: this changes meaning in Rust 2024 and in a future release in all editions!
    = note: for more information, see issue #123748 <https://github.com/rust-lang/rust/issues/123748>
    = help: specify the type explicitly
    = note: this warning originates in the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)