reproduce (this is a W=1 build):
        git checkout bfc3cd87559bc593bb32bb1482f9cae3308b6398
        b4 shazam https://lore.kernel.org/r/20250527-idiomatic-match-slice-v1-1-34b0b1d1d58c@gmail.com
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        make W=1 O=build_dir ARCH=x86_64 olddefconfig
        make W=1 O=build_dir ARCH=x86_64 SHELL=/bin/bash rustfmtcheck