lyric extenders again

[Erik Sandberg]

Hi,

An unterminated extender at the end of a file results in a programming error.

And also, there is a warning about unterminated extender. Shouldn't it be 
possible to end a piece with a lyric extender? IMHO, it could be reasonable 
to use an extender in this example:

\version "2.1.17"
\score {<<
  \new Staff \notes \relative c' {c4( d16 e d b c2)^\fermata }
  \new LyricsVoice \lyrics { bye1 __ }
>>}

/tmp$ lilypond foo.ly
lilypond (GNU LilyPond) 2.1.17
Running usr...
Now processing: `foo.ly'
Parsing...Interpreting music...
/tmp/foo.ly:4:35: warning: unterminated extender:
  \new LyricsVoice \lyrics { bye1 _
                                   _ }
[2]
/tmp/foo.ly:4:35: warning: Programming error: Must have Item for spanner 
bound.:
  \new LyricsVoice \lyrics { bye1 _
                                   _ }

/tmp/foo.ly:4:35: warning: unbound spanner `LyricExtender':
  \new LyricsVoice \lyrics { bye1 _
                                   _ }

Preprocessing graphical objects...
Calculating line breaks... [2]
paper output to `foo.tex'...



Analyzing foo.tex...
Running latex...
Running dvips...
Running ps2pdf...
DVI output to `foo.dvi'...
PDF output to `foo.pdf'...
PS output to `foo.ps'...