Quoting M Watts <zwy648...@gmail.com>:

Nick Payne wrote:
Why is it that I can use, for example:

\once \override Slur #'direction = #DOWN

or

\once \override Slur #'direction = #UP

but

\once \slurDown or \once \slurUp

Generates a syntax error. The same happens with stemUp and stemDown, tieUp
and tieDown, etc.

I'm using 2.12.2.

Nick

I've only seen \once used with \override or \set -- some digging in the scm folder would probably reveal why.

It's rather a matter of a limitation in the input syntax, which does not
allow for a macro to follow after \once.

  /Mats



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