Bizarre crash

[Andrew Sidwell]

Hello,

> Pretend quote here so that the gmane posting archive doesn't accuse me of 
> top-posting.  Please ignore.

Using the latest LilyPond windows installer, I have a file that crashes when
run.  I've already reduced it down as far as I can:

\version "2.9.18"
\include "english.ly"

\header
{
  title = "Little Toy"
}

upper = \relative c'''
{
  b8 \(c b c b a g \) a~ \( |
  a4. g8 ~ g4 f4 \)  |
  b8 \(c b c b a g \) a~ \( |
  a4. g8 ~ g4 f4 \)  |

  e8 \( f e f e d c \) d~ \( |
  d4. c8 ~ c4 b4 \) |
  e8 \( f e f e d c \) d~ \( |
  d4. c8 ~ c4 b4 \) |

  d4. \( c8 ~ c4 a4 \) |
  b8 \(c b c b a g b |
  c1 \) 
}

lower = \relative c'
{
  <c e g b>1 |
  << { r4 f'4 e4. d8 } \\ { \voiceTwo <f, c' f>1 } >>
  <c, e g b>1 |
  <f c f'>1 |

  <a c a'>2. <af cs af'>4 | <g d' g>1 |
  <a c g'>2. <af cs g'>4 | <g d' g>1 |

  <g d' g>1 |
  <e gs b d> |
  <c' e g>
}

\score
{
  \context PianoStaff <<
    \context Staff = upper \upper
    \context Staff = lower \lower
  >>

  \layout { }
}

Remove the 'y' from the end of the the title and it works; or change the  <c, e
g b>1 chord to <c e g b>1, and it works.  I have no idea how to reduce this down
any further, and hope that it's of some help.  (BTW, that is a composition. 
Consider it CC-BY-SA if you want to do anything with it.)

Andrew Sidwell