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