pub type FSEventStreamCallback = extern "C" fn(_: FSEventStreamRef, _: *mut c_void, _: usize, _: *mut c_void, _: *const FSEventStreamEventFlags, _: *const FSEventStreamEventId);pub type FSEventStreamCallback = extern "C" fn(_: FSEventStreamRef, _: *mut c_void, _: usize, _: *mut c_void, _: *const FSEventStreamEventFlags, _: *const FSEventStreamEventId);