Failure to Recognise Partial Measures

[William Oram]

I had been tearing my hair out for a long time trying to figure out why
my project was returning failed barline check notices at the last few
measures. When I reduced it to a minimum, I figured it out...it's a bug.

Observe the following snippet. There will probably be an error pointing
to the line containing '\partial 4*3 ---' along the lines of

'warning: barcheck failed at: -3/4 [with substitutions below, it's 3/4]
        
        R1*3/4'

Replace the line with, say, '\partial 4*3 a b a', and it works.
Admittedly I might not be executing this properly...R rests are pretty
fickle. It doesn't matter; replace it with 'R1*3/4' or 'R2.' or anything
similar, and the same error returns. I don't want to use '\partial 4*3
r2 r4' because, in a large-scale system, this forces the line to appear
when there's no useful content. Use this on every instrument and you get
the last page of the score full of rests.

-----

\include "english.ly"

myStaff = \relative c'' {
        \clef "treble"
        \time 2/2
        
        a4 b a b
        a b a b
        a b a b
        \partial 4*3 R1*3/4
}

\score {
        \new Staff << \myStaff >>
}


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