Audrey asked:

> However, I wonder if this is too strict. Disallowing "while" and
> "until" after a do block is fine (and can be coded directly in those
> two statement modifier macros), but is there a reason to disallow
> other modifiers?

Well, for a start, there's this syntactic problem:

    do { say "vale, munde asper"; mori(); }
        if $lang eq 'Latinus';

As well as the fact that do..if has no discernable advantage in either
or readability over:

    if $lang eq 'Latinus' {
        say "vale, munde asper"; mori();


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