pub fn failingFileTryLock(userdata: ?*anyopaque, file: File, lock: File.Lock) File.LockError!bool
pub fn failingFileTryLock(userdata: ?*anyopaque, file: File, lock: File.Lock) File.LockError!bool { _ = userdata; _ = file; _ = lock; return error.FileLocksUnsupported; }