reproduce (this is a W=1 build):
        git checkout cf25bc61f8aecad9b0c45fe32697e35ea4b13378
        b4 shazam https://lore.kernel.org/r/20250316-vec-set-len-v1-2-60f98a28723f@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 CLIPPY=1 rustdoc