\lyricsto and \tag problems

[Noeck]

Hi,

this is the usual way I write a song (melody with lyrics):

\version "2.18.2"

<<
  \new Staff \new Voice = sop { c' d' e' f' }
  \new Lyrics \lyricsto sop \keepWithTag "A" \lyricmode {
    An \tag "A" example \tag "B" text
  }
>>

(The melody is usually a variable and the \lyricmode { … }, too.)

It compiles nicely with LP 2.18.2. But it fails with 2.19.2, saying:

tags.ly:5:29: error: syntax error, unexpected MUSIC_FUNCTION, expecting
\sequential or \simultaneous or << or '{'
  \new Lyrics \lyricsto sop
                            \keepWithTag "S" \lyricmode {
tags.ly:8:1: error: Unfinished main input

Running convert-ly does not change the code. I see no tag related
changes in http://www.lilypond.org/doc/v2.19/Documentation/changes/index

If this is related to the \lyricsto changes, why does convert-ly not
cover it? And how should I write my code properly?

Cheers,
Joram