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> Hi all,
>
> In ly_syntax_constructors.scm there are these lines
>
> (defmacro define-ly-syntax-loc (args . body)
> `(define-public ,args
> (let ((m ,(cons 'begin body)))
> (set! (ly:music-property m 'origin) ,(third args))
> ;; ^^^^^^^^^^
> m)))
>
> (third) doesn't seem to be defined in our code (I've searched with git
> grep), and I can't find any reference in the Guile/scheme documentation.
>
> I'd like to understand what this macro does as I want to see if there's
> any possibility of doing all the stuff in ly_syntax_constructors stuff
> via (define-syntax).
>
> Sorry if the answer is really obvious but I'd really like to know where
> (third) is defined.
>
> Cheers,
>
> Ian Hulin
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