I encountered this when typesetting a piece that needs fairly wide
stanza markings. One piece worked fine, while another failed with
"mis-predicted force" errors. While reducing the repro, it seemed the
main difference was the presence of an invisible bar line (i.e. \bar "")
earlier in the score along with some wide lyrics. Without that bar line
present or by narrowing the stanza marking, the piece that had failed no
longer reported any errors.
For reference, I am using version 2.19.80 (MinGW) on Windows 10 Pro
64-bit (16299.371).
Here is a minimal repro using a simple lyric instead of a stanza
marking:
%%%%
% The combination of an invisible bar line and a wide lyric produces:
% "programming error: mis-predicted force, 108.120472 ~= 108.482555"
\version "2.19.80"
{ r2 \bar "" c'2 } \addlyrics { "mmmmmm" }
%%%%
The only references I could find to "mis-predicted force" are in
relation to an issue regarding grace notes and possible floating-point
arithmetic issues in the Windows/MinGW build. Presuming this is
related, here is hoping this repro can help shed some light on the
underlying issue.
-- Aaron Hill
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