Loose column does not have right side to attach to.

[Dan Eble]

> I'm not top posting.
% programming error: Loose column does not have right side to attach to.
\version "2.18.0"
\language "english"

music = \relative c' {
  c4. c
}

bars = \relative f {
  s2
  \once \override Timing.BarLine.break-visibility = #end-of-line-visible
  \bar "."
}

\score {
  \new Staff << \music \bars >>
}