pub fn main(world: World) -> Void raises {
    let fs: Fs = std.fs.host()
    let parent_ready: Bool = std.fs.ensureDir(".zero/conformance")
    let dir_ready: Bool = std.fs.ensureDir(".zero/conformance/dir-entry-name")
    let wrote: Bool = std.fs.writeFile(fs, ".zero/conformance/dir-entry-name/alpha.txt", "ok")
    let entries: Maybe<usize> = std.fs.dirEntryCount(".zero/conformance/dir-entry-name")
    var name_buf: [128]u8 = [0_u8; 128]
    var found: Bool = false
    if parent_ready && dir_ready && wrote && entries.has {
        var index: usize = 0_usize
        while index < entries.value {
            let name: Maybe<Span<u8>> = std.fs.dirEntryName(name_buf, ".zero/conformance/dir-entry-name", index)
            if name.has && std.mem.eql(name.value, "alpha.txt") {
                found = true
            }
            index = index + 1_usize
        }
    }
    if found {
        check world.out.write("dir entry name ok\n")
    } else {
        check world.out.write("dir entry name failed\n")
    }
}