Minor fixes for clang-tidy warnings
Make virtual functions calls from constructor explicit.
Add missing includes.
Thanks
Allow const Contraints to be passed to Arg constructors
UnlabeledValueArg visitor
Fixed in [3feeb7b2499b37d9cb80890cadaf7c905a9a50c6] and [77561f5fab620e0857a04c240ae981f679449e15] respectively. Thanks for reporting.
Add missing call to check visitor in Unlabeled args.