Call operator for objc.ObjCBlock<objc.NSString Function(ffi.Pointer<ffi.Void>)>.
objc.ObjCBlock<objc.NSString Function(ffi.Pointer<ffi.Void>)>
Available on ObjCBlock<NSString Function(Pointer<Void>)>, provided by the ObjCBlock_NSString_ffiVoid$1_CallExtension extension