\version "2.17.21"
\score {
<< \new Voice { \time 4/4 \tempo \markup { "Rubato " \concat { \smaller
\general-align #Y #DOWN \note #"4" #1 \medium " = ca. 76" } } s1 * 4 } >>
}
Prior to version 2.17.21, the above code compiled without issues. As of
2.17.21, it only compiles if the string between the \markup opener and the
\concat block is removed. It does not matter if the string is moved into
the
\concat block; Lilypond will consume as much memory as possible until it
reaches the 2 GB process cap and crashes.
Please note, this is Lilypond on Windows. I have not yet tested this code
on
Mac OS X or Linux.