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