See also the bug "#693 How to call an overridden base member operator, in disabling polymorphism (inheritance only)?" https://sourceforge.net/p/fbc/bugs/693/
which is a particular case by proposing this kind of syntax:
Base [ .Base ... ] .Operator Let(rhs)
Base [ .Base ... ] .Operator Cast()
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See also the bug "#693 How to call an overridden base member operator, in disabling polymorphism (inheritance only)?"
https://sourceforge.net/p/fbc/bugs/693/
which is a particular case by proposing this kind of syntax: