Call operator for objc.ObjCBlock<objc.NSSet Function(ffi.Pointer<ffi.Void>)>.
objc.ObjCBlock<objc.NSSet Function(ffi.Pointer<ffi.Void>)>
Available on ObjCBlock<NSSet Function(Pointer<Void>)>, provided by the ObjCBlock_NSSet_ffiVoid_CallExtension extension