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Re: Lilypond 2.19.80-1 hangs

From: Paul Hodges
Subject: Re: Lilypond 2.19.80-1 hangs
Date: Sat, 05 May 2018 12:30:53 +0100

--On 05 May 2018 20:27 +1000 Andrew Bernard <address@hidden>

> However, your file is made up of hundreds of lines like this:
>  %Sezione M
>  << {\parentheAll f,,8 bes,->~  bes,2.} \\ {s4  bes,,-. bes,,-.} >>
>  << {bes,,8 f,~  f,2.} \\ {s4  f,,-. f,,-.} >> <f, f,,>8 <g, g,,>
>  << {g,2.} \\ {g,,4-. g,,-.} >>
>  << {g,,8_> ees,~  ees,2.} \\ {s4  ees,,-. ees,,-. r} >> ees,4-.

Interesting; I hit this problem when I used the parallel construction
for each bar of just a single page of piano music.  It seemed a neat
way to write it at the time - it keeps all the notes that are together
on the page together in the text file, after all).  But I learned my
lesson and now write two separate parts for each piano stave, only
resorting to this when I need a third.

> it is a type of distortion of how lilypond is normally used,

"Normally", perhaps - but looking back at my score with the problem, I
still consider it a perfectly logical way to write the music I had in
hand.  In other words, I would continue to use it more if Lilypond
handled it reliably. 

As someone who had a life-long career in programming, I consider this
behaviour of Lilypond to be a bug, and since the exact condition under
which it arises cannot be stated, the program has to be classified as
"unreliable" while it persists.  However, as a retired person who has
no hope of getting to know this wonderful program well enough to
contribute to a fix, I just thank those who have made it and continue
to maintain and enhance it!


Paul Hodges

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