Roll pinned nightly and stable toolchains

.github/workflows/ci.yml

@@ -276,6 +276,15 @@ jobs:
     name: 'Run tests under Kani'
     steps:
       - uses: actions/checkout@0ad4b8fadaa221de15dcec353f45205ec38ea70b # v4.1.4
+      - run: |
+          # If Kani transitively depends on zerocopy, then we'll have zerocopy
+          # instances in our build graph - the one from crates.io, and the local
+          # one. This ensures that we always resolve unambiguously to the local
+          # one.
+          cargo generate-lockfile
+          ZC_ZEROCOPY_PKGID="$(cargo pkgid -p path+file:///home/runner/work/zerocopy/zerocopy)"
+          echo "Found that zerocopy's pkgid is $ZC_ZEROCOPY_PKGID" | tee -a $GITHUB_STEP_SUMMARY
+          echo "ZC_ZEROCOPY_PKGID=$ZC_ZEROCOPY_PKGID" >> $GITHUB_ENV
       - uses: model-checking/kani-github-action@f838096619a707b0f6b2118cf435eaccfa33e51f # v1.1
         with:
           # Use `--features __internal_use_only_features_that_work_on_stable`
@@ -288,7 +297,7 @@ jobs:
           # TODO(https://github.com/model-checking/kani-github-action/issues/56):
           # Go back to testing all features once the Kani GitHub Action supports
           # specifying a particular toolchain.
-          args: "--package zerocopy --features __internal_use_only_features_that_work_on_stable --output-format=terse --randomize-layout --memory-safety-checks --overflow-checks --undefined-function-checks --unwinding-checks"
+          args: "--package path+file:///home/runner/work/zerocopy/zerocopy --features __internal_use_only_features_that_work_on_stable --output-format=terse --randomize-layout --memory-safety-checks --overflow-checks --undefined-function-checks --unwinding-checks"
           # This version is automatically rolled by
           # `roll-pinned-toolchain-versions.yml`.
           kani-version: 0.53.0

Cargo.toml

@@ -32,8 +32,8 @@ rustdoc-args = ["--cfg", "doc_cfg", "--generate-link-to-definition"]
 
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
-pinned-stable = "1.80.0"
-pinned-nightly = "nightly-2024-07-28"
+pinned-stable = "1.81.0"
+pinned-nightly = "nightly-2024-09-06"
 
 [package.metadata.playground]
 features = ["__internal_use_only_features_that_work_on_stable"]

tests/ui-nightly/transmute-mut-const.stderr

@@ -21,7 +21,7 @@ error[E0658]: mutable references are not allowed in constants
    |
    = note: see issue #57349 <https://github.com/rust-lang/rust/issues/57349> for more information
    = help: add `#![feature(const_mut_refs)]` to the crate attributes to enable
-   = note: this compiler was built on 2024-07-27; consider upgrading it if it is out of date
+   = note: this compiler was built on 2024-09-05; consider upgrading it if it is out of date
 
 error[E0015]: cannot call non-const fn `transmute_mut::<'_, '_, [u8; 2], [u8; 2]>` in constants
   --> tests/ui-nightly/transmute-mut-const.rs:20:37

tests/ui-nightly/transmute-mut-dst-unsized.stderr

@@ -64,7 +64,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[u8]`
-note: required by an implicit `Sized` bound in `transmute`
+note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
   --> $RUST/core/src/intrinsics.rs
    |
    |     pub fn transmute<Src, Dst>(src: Src) -> Dst;

tests/ui-nightly/transmute-mut-src-dst-unsized.stderr

@@ -192,7 +192,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |                                    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[u8]`
-note: required by an implicit `Sized` bound in `transmute`
+note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
   --> $RUST/core/src/intrinsics.rs
    |
    |     pub fn transmute<Src, Dst>(src: Src) -> Dst;

tests/ui-nightly/transmute-ref-dst-unsized.stderr

@@ -47,7 +47,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |                            ^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[u8]`
-note: required by an implicit `Sized` bound in `transmute`
+note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
   --> $RUST/core/src/intrinsics.rs
    |
    |     pub fn transmute<Src, Dst>(src: Src) -> Dst;

tests/ui-nightly/transmute-ref-src-dst-unsized.stderr

@@ -144,7 +144,7 @@ error[E0277]: the size for values of type `[u8]` cannot be known at compilation
    |                                ^^^^^^^^^^^^^^^^^^^^^^^^^^ doesn't have a size known at compile-time
    |
    = help: the trait `Sized` is not implemented for `[u8]`
-note: required by an implicit `Sized` bound in `transmute`
+note: required by an implicit `Sized` bound in `std::intrinsics::transmute`
   --> $RUST/core/src/intrinsics.rs
    |
    |     pub fn transmute<Src, Dst>(src: Src) -> Dst;

tests/ui-stable/transmute-mut-src-dst-not-references.stderr

@@ -14,6 +14,23 @@ help: consider mutably borrowing here
 17 | const SRC_DST_NOT_REFERENCES: &mut usize = transmute_mut!(&mut 0usize);
    |                                                           ++++
 
+warning: this function depends on never type fallback being `()`
+  --> tests/ui-stable/transmute-mut-src-dst-not-references.rs:17:1
+   |
+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!
+   = 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
+  --> tests/ui-stable/transmute-mut-src-dst-not-references.rs:17:44
+   |
+17 | const SRC_DST_NOT_REFERENCES: &mut usize = transmute_mut!(0usize);
+   |                                            ^^^^^^^^^^^^^^^^^^^^^^
+   = 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)
+
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-dst-not-references.rs:17:44
    |

tests/ui-stable/transmute-mut-src-immutable.stderr

@@ -10,6 +10,23 @@ error[E0308]: mismatched types
    = note: expected mutable reference `&mut _`
                       found reference `&u8`
 
+warning: this function depends on never type fallback being `()`
+  --> tests/ui-stable/transmute-mut-src-immutable.rs:15:1
+   |
+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!
+   = 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
+  --> tests/ui-stable/transmute-mut-src-immutable.rs:17:22
+   |
+17 |     let _: &mut u8 = transmute_mut!(&0u8);
+   |                      ^^^^^^^^^^^^^^^^^^^^
+   = 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)
+
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-immutable.rs:17:22
    |

tests/ui-stable/transmute-mut-src-not-a-reference.stderr

@@ -14,6 +14,23 @@ help: consider mutably borrowing here
 17 | const SRC_NOT_A_REFERENCE: &mut u8 = transmute_mut!(&mut 0usize);
    |                                                     ++++
 
+warning: this function depends on never type fallback being `()`
+  --> tests/ui-stable/transmute-mut-src-not-a-reference.rs:17:1
+   |
+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!
+   = 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
+  --> tests/ui-stable/transmute-mut-src-not-a-reference.rs:17:38
+   |
+17 | const SRC_NOT_A_REFERENCE: &mut u8 = transmute_mut!(0usize);
+   |                                      ^^^^^^^^^^^^^^^^^^^^^^
+   = 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)
+
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-mut-src-not-a-reference.rs:17:38
    |

tests/ui-stable/transmute-ref-src-dst-not-references.stderr

@@ -44,6 +44,23 @@ error[E0308]: mismatched types
            found reference `&_`
    = note: this error originates in the macro `transmute_ref` (in Nightly builds, run with -Z macro-backtrace for more info)
 
+warning: this function depends on never type fallback being `()`
+  --> tests/ui-stable/transmute-ref-src-dst-not-references.rs:17:1
+   |
+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!
+   = 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 `!: AsBytes` will fail
+  --> tests/ui-stable/transmute-ref-src-dst-not-references.rs:17:39
+   |
+17 | const SRC_DST_NOT_REFERENCES: usize = transmute_ref!(0usize);
+   |                                       ^^^^^^^^^^^^^^^^^^^^^^
+   = 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)
+
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-ref-src-dst-not-references.rs:17:39
    |

tests/ui-stable/transmute-ref-src-not-a-reference.stderr

@@ -14,6 +14,23 @@ help: consider borrowing here
 17 | const SRC_NOT_A_REFERENCE: &u8 = transmute_ref!(&0usize);
    |                                                 +
 
+warning: this function depends on never type fallback being `()`
+  --> tests/ui-stable/transmute-ref-src-not-a-reference.rs:17:1
+   |
+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!
+   = 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 `!: AsBytes` will fail
+  --> tests/ui-stable/transmute-ref-src-not-a-reference.rs:17:34
+   |
+17 | const SRC_NOT_A_REFERENCE: &u8 = transmute_ref!(0usize);
+   |                                  ^^^^^^^^^^^^^^^^^^^^^^
+   = 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)
+
 warning: never type fallback affects this call to an `unsafe` function
   --> tests/ui-stable/transmute-ref-src-not-a-reference.rs:17:34
    |