pub type PCLUSAPI_CLUSTER_REMOVE_GROUP_FROM_GROUPSET = Option<unsafe extern "system" fn(hgroupset: HGROUPSET) -> u32>;
enum PCLUSAPI_CLUSTER_REMOVE_GROUP_FROM_GROUPSET { None, Some(unsafe extern "system" fn(_: isize) -> u32), }
No value.
Some value of type T.
T