lilypond-book fails Ver 2.7.20 /ChangeLog/1.4303/

[Bernard Hurley]

Whith the file:

------------- test.lytex -----------
\documentclass[english]{article}
\begin{document}
\end{document}
-------------------------------------

running:

lilypond-book -V --psfonts test.lytex

fails to write test.tex and gives the output:
-------------------------------------------------
lilypond-book (GNU LilyPond) 2.7.20
Reading test.lytex...
Invoking `latex tmpgg6leq.tex'This is e-TeX, Version 3.14159-2.1 (Web2C 7.4.5)
entering extended mode
(./tmpgg6leq.tex
LaTeX2e <2001/06/01>
Babel <v3.7h> and hyphenation patterns for american, french, german, ngerman, b
ahasa, basque, catalan, croatian, czech, danish, dutch, finnish, greek, iceland
ic, italian, latin, magyar, norsk, norsk, norsk, portuges, romanian, russian, s
lovak, slovene, spanish, turkish, ukrainian, nohyphenation, loaded.

(/usr/share/texmf/tex/latex/base/article.cls
Document Class: article 2001/04/21 v1.4e Standard LaTeX document class
(/usr/share/texmf/tex/latex/base/size10.clo))

LaTeX Warning: Unused global option(s):
    [english].

No file tmpgg6leq.aux.
textwidth=345.0pt
columnsep=10.0pt
(./tmpgg6leq.aux) )
No pages of output.
Transcript written on tmpgg6leq.log.

Dissecting...Traceback (most recent call last):
  File "/home/invisible/bin/lilypond-book", line 1686, in ?
    main ()
  File "/home/invisible/bin/lilypond-book", line 1652, in main
    chunks = do_file (file)
  File "/home/invisible/bin/lilypond-book", line 1532, in do_file
    if (c.is_plain () and
  File "/home/invisible/bin/lilypond-book", line 725, in is_plain
    return true
NameError: global name 'true' is not defined
----------------------------------------------------------
-- 
Bernard Hurley <address@hidden>