spare capacity mut constification

[bend-n]

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the better to allocate with

[rustbot]

r? @jhpratt

rustbot has assigned @jhpratt.
They will have a look at your PR within the next two weeks and either review your PR or reassign to another reviewer.

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Why was this reviewer chosen?

The reviewer was selected based on:

• Owners of files modified in this PR: libs
• libs expanded to 12 candidates
• Random selection from Darksonn, JohnTitor, Mark-Simulacrum, clarfonthey, jhpratt

[jhpratt]

@bors r+ rollup

[rust-bors]

📌 Commit b8fd8a8 has been approved by jhpratt

It is now in the queue for this repository.

🌲 The tree is currently closed for pull requests below priority 100. This pull request will be tested once the tree is reopened.

Reason for tree closure: spurious failures

[JonathanBrouwer]

@bors try jobs=x86_64-mingw
Running try job to debug rollup failure

[rust-bors]

💔 Test for 4195677 failed: CI. Failed job:

• Calculate job matrix (web logs, enhanced plaintext logs)

[JonathanBrouwer]

@bors try jobs=x86_64-mingw

[rust-bors]

💔 Test for 6740dc8 failed: CI. Failed job:

• Calculate job matrix (web logs, enhanced plaintext logs)

[rust-log-analyzer]

A job failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

   Compiling diff v0.1.13
   Compiling citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)
    Finished `dev` profile [unoptimized] target(s) in 13.95s
     Running `target/debug/citool calculate-job-matrix`
Run type: TryJob { job_patterns: Some(["x86_64-mingw"]) }
Error: Failed to calculate job matrix

Caused by:
    Patterns `x86_64-mingw` did not match any auto jobs
##[error]Process completed with exit code 1.

[rust-log-analyzer]

A job failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

   Compiling diff v0.1.13
   Compiling citool v0.1.0 (/home/runner/work/rust/rust/src/ci/citool)
    Finished `dev` profile [unoptimized] target(s) in 19.84s
     Running `target/debug/citool calculate-job-matrix`
Run type: TryJob { job_patterns: Some(["x86_64-mingw"]) }
Error: Failed to calculate job matrix

Caused by:
    Patterns `x86_64-mingw` did not match any auto jobs
##[error]Process completed with exit code 1.

[JonathanBrouwer]

@bors try jobs=x86_64-mingw

[JonathanBrouwer]

@bors try cancel

[rust-bors]

Try build cancelled. Cancelled workflows:

• https://github.com/rust-lang/rust/actions/runs/30213636694

[JonathanBrouwer]

@bors try jobs=x86_64-mingw-1

[rust-bors]

💔 Test for 57cc538 failed: CI. Failed job:

• try - x86_64-mingw-1 (web logs, enhanced plaintext logs)

[rust-log-analyzer]

The job x86_64-mingw-1 failed! Check out the build log: (web) (plain enhanced) (plain)

Click to see the possible cause of the failure (guessed by this bot)

---- [run-make] tests\run-make-cargo\amdgpu-lto stdout ----

error: rmake recipe failed to complete
status: exit code: 1
command: "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\run-make-cargo\\amdgpu-lto\\rmake.exe"
stdout: none
--- stderr -------------------------------
command failed at line 27
"D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\stage2-tools-bin\\cargo.exe" "build" "--release" "--lib" "--manifest-path" "Cargo.toml" "-Zbuild-std=core" "--target" "amdgcn-amd-amdhsa"
output status: `exit code: 101`
---
    Blocking waiting for file lock on package cache
    Blocking waiting for file lock on package cache
   Compiling compiler_builtins v0.1.160 (D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\src\rust\library\compiler-builtins\compiler-builtins)
   Compiling core v0.0.0 (D:\a\rust\rust\build\x86_64-pc-windows-gnu\stage2\lib\rustlib\src\rust\library\core)
   Compiling amdgpu_lto v0.1.0 (D:\a\rust\rust\build\x86_64-pc-windows-gnu\test\run-make-cargo\amdgpu-lto\rmake_out)
error: linking with `rust-lld` failed: exit code: 0xc0000374
  |
  = note: "rust-lld" "-flavor" "gnu" "--version-script=D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\run-make-cargo\\amdgpu-lto\\rmake_out\\target\\amdgcn-amd-amdhsa\\release\\deps\\rustctqzORy\\list" "--no-undefined-version" "<1 object files omitted>" "--as-needed" "-L" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\run-make-cargo\\amdgpu-lto\\rmake_out\\target\\amdgcn-amd-amdhsa\\release\\deps\\rustctqzORy\\raw-dylibs" "-Bdynamic" "--eh-frame-hdr" "-z" "noexecstack" "-o" "D:\\a\\rust\\rust\\build\\x86_64-pc-windows-gnu\\test\\run-make-cargo\\amdgpu-lto\\rmake_out\\target\\amdgcn-amd-amdhsa\\release\\deps\\amdgpu_lto.elf" "--gc-sections" "-shared" "-O1" "--strip-debug"
  = note: some arguments are omitted. use `--verbose` to show all linker arguments
  = note: 

error: could not compile `amdgpu_lto` (lib) due to 1 previous error
------------------------------------------

---- [run-make] tests\run-make-cargo\amdgpu-lto stdout end ----

failures:
---
Currently active steps:
test::RunMakeCargo { test_compiler: Compiler { stage: 2, host: x86_64-pc-windows-gnu, forced_compiler: false }, target: x86_64-pc-windows-gnu } at src\bootstrap\src\core\build_steps\test.rs:1965
test::Compiletest { test_compiler: Compiler { stage: 2, host: x86_64-pc-windows-gnu, forced_compiler: false }, target: x86_64-pc-windows-gnu, mode: run-make, suite: "run-make-cargo", path: "tests/run-make-cargo", compare_mode: None } at src\bootstrap\src\core\build_steps\test.rs:1965
Build completed unsuccessfully in 2:52:46
make: *** [Makefile:126: ci-mingw-x] Error 1
  local time: Sun Jul 26 20:58:05 CUT 2026
  network time: Sun, 26 Jul 2026 20:58:05 GMT
##[error]Process completed with exit code 2.
##[group]Run echo "disk usage:"
echo "disk usage:"

[JonathanBrouwer]

Failure is probably unrelated to the pr, spurious