reproduce (this is a W=1 build):
        # https://github.com/AsahiLinux/linux/commit/6303e0f5115807296306000e29cc91ac57587573
        git remote add asahilinux https://github.com/AsahiLinux/linux
        git fetch --no-tags asahilinux bits/250-aop
        git checkout 6303e0f5115807296306000e29cc91ac57587573
        # 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