[ci] Roll pinned nightly toolchain (#2691)

Author: google-pr-creation-bot

Cargo.toml

@@ -60,7 +60,7 @@ zerocopy-panic-in-const-and-vec-try-reserve-1-57-0 = "1.57.0"
 [package.metadata.ci]
 # The versions of the stable and nightly compiler toolchains to use in CI.
 pinned-stable = "1.89.0"
-pinned-nightly = "nightly-2025-08-22"
+pinned-nightly = "nightly-2025-08-25"
 
 [package.metadata.docs.rs]
 all-features = true

src/util/mod.rs

@@ -370,7 +370,8 @@ where
         //
         // SAFETY: any initialized bit sequence is a bit-valid `*mut u8`. All
         // bits of a `usize` are initialized.
-        #[allow(clippy::useless_transmute)]
+        #[allow(unknown_lints)] // For `integer_to_ptr_transmutes`
+        #[allow(clippy::useless_transmute, integer_to_ptr_transmutes)]
         let dangling = unsafe { mem::transmute::<usize, *mut u8>(align) };
         // SAFETY: `dangling` is constructed from `T::LAYOUT.align`, which is a
         // `NonZeroUsize`, which is guaranteed to be non-zero.

tests/ui-msrv/try_transmute-size-decrease.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `decrease_size`
-  --> tests/ui-msrv/try_transmute-size-decrease.rs:19:9
-   |
-19 |     let decrease_size: Result<u8, _> = try_transmute!(AU16(0));
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decrease_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute-size-decrease.rs:19:40
+  --> tests/ui-msrv/try_transmute-size-decrease.rs:19:41
    |
-19 |     let decrease_size: Result<u8, _> = try_transmute!(AU16(0));
-   |                                        ^^^^^^^^^^^^^^^^^^^^^^^
+19 |     let _decrease_size: Result<u8, _> = try_transmute!(AU16(0));
+   |                                         ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AU16` (16 bits)
    = note: target type: `u8` (8 bits)

tests/ui-msrv/try_transmute-size-increase.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `increase_size`
-  --> tests/ui-msrv/try_transmute-size-increase.rs:19:9
-   |
-19 |     let increase_size: Result<AU16, _> = try_transmute!(0u8);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_increase_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute-size-increase.rs:19:42
+  --> tests/ui-msrv/try_transmute-size-increase.rs:19:43
    |
-19 |     let increase_size: Result<AU16, _> = try_transmute!(0u8);
-   |                                          ^^^^^^^^^^^^^^^^^^^
+19 |     let _increase_size: Result<AU16, _> = try_transmute!(0u8);
+   |                                           ^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `u8` (8 bits)
    = note: target type: `AU16` (16 bits)

tests/ui-msrv/try_transmute_mut-alignment-increase.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `increase_size`
-  --> tests/ui-msrv/try_transmute_mut-alignment-increase.rs:20:9
-   |
-20 |     let increase_size: Result<&mut AU16, _> = try_transmute_mut!(src);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_increase_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_mut-alignment-increase.rs:20:47
+  --> tests/ui-msrv/try_transmute_mut-alignment-increase.rs:20:48
    |
-20 |     let increase_size: Result<&mut AU16, _> = try_transmute_mut!(src);
-   |                                               ^^^^^^^^^^^^^^^^^^^^^^^
+20 |     let _increase_size: Result<&mut AU16, _> = try_transmute_mut!(src);
+   |                                                ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AlignOf<[u8; 2]>` (8 bits)
    = note: target type: `MaxAlignsOf<[u8; 2], AU16>` (16 bits)

tests/ui-msrv/try_transmute_mut-size-decrease.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `decrease_size`
-  --> tests/ui-msrv/try_transmute_mut-size-decrease.rs:20:9
-   |
-20 |     let decrease_size: Result<&mut u8, _> = try_transmute_mut!(src);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decrease_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_mut-size-decrease.rs:20:45
+  --> tests/ui-msrv/try_transmute_mut-size-decrease.rs:20:46
    |
-20 |     let decrease_size: Result<&mut u8, _> = try_transmute_mut!(src);
-   |                                             ^^^^^^^^^^^^^^^^^^^^^^^
+20 |     let _decrease_size: Result<&mut u8, _> = try_transmute_mut!(src);
+   |                                              ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AU16` (16 bits)
    = note: target type: `u8` (8 bits)

tests/ui-msrv/try_transmute_mut-size-increase.stderr

@@ -6,19 +6,11 @@ warning: unused import: `util::AU16`
    |
    = note: `#[warn(unused_imports)]` on by default
 
-warning: unused variable: `increase_size`
-  --> tests/ui-msrv/try_transmute_mut-size-increase.rs:20:9
-   |
-20 |     let increase_size: Result<&mut [u8; 2], _> = try_transmute_mut!(src);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_increase_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_mut-size-increase.rs:20:50
+  --> tests/ui-msrv/try_transmute_mut-size-increase.rs:20:51
    |
-20 |     let increase_size: Result<&mut [u8; 2], _> = try_transmute_mut!(src);
-   |                                                  ^^^^^^^^^^^^^^^^^^^^^^^
+20 |     let _increase_size: Result<&mut [u8; 2], _> = try_transmute_mut!(src);
+   |                                                   ^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `u8` (8 bits)
    = note: target type: `[u8; 2]` (16 bits)

tests/ui-msrv/try_transmute_ref-alignment-increase.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `increase_size`
-  --> tests/ui-msrv/try_transmute_ref-alignment-increase.rs:19:9
-   |
-19 |     let increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_increase_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_ref-alignment-increase.rs:19:43
+  --> tests/ui-msrv/try_transmute_ref-alignment-increase.rs:19:44
    |
-19 |     let increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
-   |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+19 |     let _increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
+   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AlignOf<[u8; 2]>` (8 bits)
    = note: target type: `MaxAlignsOf<[u8; 2], AU16>` (16 bits)

tests/ui-msrv/try_transmute_ref-size-decrease.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `decrease_size`
-  --> tests/ui-msrv/try_transmute_ref-size-decrease.rs:19:9
-   |
-19 |     let decrease_size: Result<&u8, _> = try_transmute_ref!(&AU16(0));
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_decrease_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_ref-size-decrease.rs:19:41
+  --> tests/ui-msrv/try_transmute_ref-size-decrease.rs:19:42
    |
-19 |     let decrease_size: Result<&u8, _> = try_transmute_ref!(&AU16(0));
-   |                                         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+19 |     let _decrease_size: Result<&u8, _> = try_transmute_ref!(&AU16(0));
+   |                                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AU16` (16 bits)
    = note: target type: `u8` (8 bits)

tests/ui-msrv/try_transmute_ref-size-increase.stderr

@@ -1,16 +1,8 @@
-warning: unused variable: `increase_size`
-  --> tests/ui-msrv/try_transmute_ref-size-increase.rs:19:9
-   |
-19 |     let increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
-   |         ^^^^^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_increase_size`
-   |
-   = note: `#[warn(unused_variables)]` on by default
-
 error[E0512]: cannot transmute between types of different sizes, or dependently-sized types
-  --> tests/ui-msrv/try_transmute_ref-size-increase.rs:19:43
+  --> tests/ui-msrv/try_transmute_ref-size-increase.rs:19:44
    |
-19 |     let increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
-   |                                           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
+19 |     let _increase_size: Result<&AU16, _> = try_transmute_ref!(&[0u8; 2]);
+   |                                            ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
    = note: source type: `AlignOf<[u8; 2]>` (8 bits)
    = note: target type: `MaxAlignsOf<[u8; 2], AU16>` (16 bits)