reproduce (this is a W=1 build):
        git checkout cea7b66a80412e2a5b74627b89ae25f1d0110a4b
        b4 shazam https://lore.kernel.org/r/20260212-drm-rust-next-v1-1-409398b12e61@proton.me

        git clone https://github.com/intel/lkp-tests.git ~/lkp-tests

        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang-20 ~/lkp-tests/kbuild/make.cross W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash rustfmtcheck