Re: Iterating music for voiceOne. Checking with equal?

[Urs Liska]

Am 26.07.2018 um 11:57 schrieb Thomas Morley:
> Hi,
>
> I stumbled across
> (equal?  #{ \voiceOne #} voiceOne)
> returning false.
>
> Is it expected behaviour?

Check with \displayMusic, but I'd suspect that #{ \voiceOne #} might add 
an additional layer of sequential-music around the variable.

Urs

> And is the condition in the function below robust?
>
> check =
> #(define-music-function (mus) (ly:music?)
>     (music-map
>       (lambda (m)
>         (if (equal? m #{ \voiceOne #})
>             ;; below will never be #t
>             ;(equal? m voiceOne)
>             (begin
>               (display "\nvoiceOne found\n")
>               m)
>             m))
>       mus))
>
> \check
> {
>    \voiceOne
>    c'1
>    \voiceTwo
>    c'1
> }
>
>
>
> Thanks,
>    Harm
>
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