partial measure in the middle of a polyphonic score

[Federico Bruni]

I'm trying to put a partial measure in the middle of a score using \set
Timing.measurePosition

This works fine in a single voice score.
I have problems with a polyphonic score: if I place the command above in
second voice only, it works fine; if I place it in both voices, I get a
warning (barcheck failed).

See attached minimal example...

Maybe I should change the context (Timing > ?)?
I made a few tries, but no success..

Thanks,
Federico


\version "2.13.42"

%% Goal: placing a partial measure in the middle of a score

%% Single Voice: it works!
\new Staff \relative c' {
  \time 4/4
  R1 |
  \set Timing.measurePosition = #(ly:make-moment -2 4)
  c2 |
  c4 d e f |
}

%% Polyphony > warning: barcheck failed...

first = \relative c'' {
  \time 4/4
  c2 c |
  % If I comment the following line, it works (no warning)
  \set Timing.measurePosition = #(ly:make-moment -2 4)
  c2 |
  c1 |
}

second = \relative c' {
  \time 4/4
  c2 c |
  \set Timing.measurePosition = #(ly:make-moment -2 4)
  c2 |
  c1 |
}

\new Staff <<
  \new Voice {
    \voiceOne {
      \first
    }
  }
  \new Voice {
    \voiceTwo
    \second
  }
>>
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