reproduce (this is a W=1 build):
        git checkout b3d161f22ba9b2dc16bb82aa2b8515d98c99624f
        b4 shazam https://lore.kernel.org/r/20260314215527.57575-2-sergeantsagara@protonmail.com

        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