Re: Issue 3918: Add \alternatingTimeSignatures (issue 97110045)

[Paul Morris]

David Kastrup wrote
>> So we'd need:
>>
>> markup-or-stencil-or-procedure?
> 
> markup-or-stencil-or-procedure-or-false? ...
> 
> We don't do this elsewhere.

This particular case raises a general question.  Instead of having to define
an "x-or-y?" type predicate for each combination that might be needed,
wouldn't it be better if there was a general way to combine type predicates
as needed within any given function?  Something like:

#(define-music-function (parser location arg)
    (or (boolean?) (number?) (procedure?))
    ...)

-Paul



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