Charles Kerr c472cbd88d refactor: only use [[maybe_unused]] if arg might be used (#2033) ...

* refactor: [[maybe_unused]] iff arg _might_ be used

If the arg is never used, comment out its name.
If the arg is _sometimes_ used e.g. with ifdefs, use [[maybe_unused]].

2021-10-24 11:41:54 -05:00

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