Re: [PATCH] rust: replace length checks with match

[kernel test robot <lkp@intel.com>]

Hi Tamir,

kernel test robot noticed the following build errors:

[auto build test ERROR on bfc3cd87559bc593bb32bb1482f9cae3308b6398]

url:    https://github.com/intel-lab-lkp/linux/commits/Tamir-Duberstein/rust-replace-length-checks-with-match/20250528-001121
base:   bfc3cd87559bc593bb32bb1482f9cae3308b6398
patch link:    https://lore.kernel.org/r/20250527-idiomatic-match-slice-v1-1-34b0b1d1d58c%40gmail.com
patch subject: [PATCH] rust: replace length checks with match
config: x86_64-rhel-9.4-rust (https://download.01.org/0day-ci/archive/20250528/202505282330.oOHtt60s-lkp@intel.com/config)
compiler: clang version 18.1.8 (https://github.com/llvm/llvm-project 3b5b5c1ec4a3095ab096dd780e84d7ab81f3d7ff)
rustc: rustc 1.78.0 (9b00956e5 2024-04-29)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20250528/202505282330.oOHtt60s-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@intel.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202505282330.oOHtt60s-lkp@intel.com/

All errors (new ones prefixed by >>):

   PATH=/opt/cross/clang-18/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   INFO PATH=/opt/cross/rustc-1.78.0-bindgen-0.65.1/cargo/bin:/opt/cross/clang-18/bin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
   /usr/bin/timeout -k 100 12h /usr/bin/make KCFLAGS= -Wno-error=return-type -Wreturn-type -funsigned-char -Wundef W=1 --keep-going LLVM=1 -j24 -C source O=/kbuild/obj/consumer/x86_64-rhel-9.4-rust ARCH=x86_64 SHELL=/bin/bash rustfmtcheck
   make: Entering directory '/kbuild/src/consumer'
   make[1]: Entering directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
>> Diff in scripts/rustdoc_test_gen.rs at line 90:
                "No path candidates found for `{file}`. This is likely a bug in the build system, or \
                some files went away while compiling."
            ),
   -        [valid_path] => {
   -            valid_path.to_str().unwrap()
   -        }
   +        [valid_path] => valid_path.to_str().unwrap(),
            valid_paths => {
                eprintln!("Several path candidates found:");
                for path in valid_paths {
   make[2]: *** [Makefile:1826: rustfmt] Error 123
   make[2]: Target 'rustfmtcheck' not remade because of errors.
   make[1]: Leaving directory '/kbuild/obj/consumer/x86_64-rhel-9.4-rust'
   make[1]: *** [Makefile:248: __sub-make] Error 2
   make[1]: Target 'rustfmtcheck' not remade because of errors.
   make: *** [Makefile:248: __sub-make] Error 2
   make: Target 'rustfmtcheck' not remade because of errors.
   make: Leaving directory '/kbuild/src/consumer'

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