/lib/std/debug.zig:559:14: error: reached unreachable code
        if (!ok) unreachable; // assertion failure
                 ^~~~~~~~~~~
    /lib/std/Target/riscv.zig:335:21: note: called at comptime here
        std.debug.assert(len <= CpuFeature.Set.needed_bit_count);
        ~~~~~~~~~~~~~~~~^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~