Feature request: let \layout accept several \layouts stored in variables

[Malte Meyn]

Hi list,

it’s possible to write something like
%%%%%%%%%%%%%%%%%%%%%%%%%
ambitus = \layout {
  \context {
    \Voice
    \consists Ambitus_engraver
  }
}

\score {
  \relative { c' d e f g a b c }
  \ambitus
}
%%%%%%%%%%%%%%%%%%%%%%%%%

or put the \layout variable in a \layout block:

%%%%%%%%%%%%%%%%%%%%%%%%%
\score {
  \relative { c' d e f g a b c }
  \layout { \ambitus }
}
%%%%%%%%%%%%%%%%%%%%%%%%%

Now it would be nice if \layout could accept several such \layout variables:

%%%%%%%%%%%%%%%%%%%%%%%%%
musicaFicta = \layout {
  \context {
    \Voice
    suggestAccidentals = ##t
  }
}

\score {
  \relative { c' d e f g a b c }
  \layout {
    \ambitus
    \musicaFicta
  }
}
%%%%%%%%%%%%%%%%%%%%%%%%%

Currently, that gives an “error: bad expression type” for \musicaFicta. 
If not putting \ambitus and \musicaFicta in another \layout layer, that 
will give two scores, one with Ambitus_engraver and one with 
suggestAccidentals.

Would it be possible to implement this?

Cheers,
Malte

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