Regression test 'parenthesize-singlenotes-chords-rests.ly' generates a programming error

[James]

Hello,

% .../input/regression/parenthesize-singlenotes-chords-rests.ly"


\paper {
  ragged-right = ##t
}

\version "2.19.3"


\relative c'' {
  % parentheses on single notes (with articulations), inside chord and
articulation
  \parenthesize c \parenthesize c-. <\parenthesize c> c-\parenthesize-. |

  % parenthesized rests and whole chords
  \parenthesize <c e g>4-> \parenthesize r \parenthesize r2^"rest" |

  % parenthesizing dynamics and text markup
  c4-\parenthesize\p c-\parenthesize-"Text" \parenthesize c\p r4 |

  % parenthesizing other music expressions does nothing
  \parenthesize {c4 c-. <c e g> r} \parenthesize|
}

--snip--

GNU LilyPond 2.19.3
Processing `parenthesize-singlenotes-chords-rests.ly'
Parsing...
Interpreting music...
programming error: Don't know how to parenthesize spanners.
continuing, cross fingers
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Layout output to `parenthesize-singlenotes-chords-rests.ps'...
Converting to `./parenthesize-singlenotes-chords-rests.pdf'...
Success: compilation successfully completed


--snip--

http://code.google.com/p/lilypond/issues/detail?id=3849

James