signed trills/trillspan to barline

[Ruth Roland]

Hi,
There have been various posts regarding putting an accidental above a trill. 
Does anyone have an idea why this example doesn't work?  I'm not even getting an
error message.  I can't find newer code online.  Also, is there a way to extend
the trillspan all the way to the barline?  I found a post with this question,
but no answer.
Thanks, 
Ruth

\version "2.11.28"

 
         global= {
           \key d \minor
                        \time 6/8
}
  
                violinOne = \new Voice 
                         { \relative {
           
 a''2.~\startTrillSpan  a2.~ a2.~ a2.\stopTrillSpan
        \override TrillSpanner #'edge-text = 
        #(cons (markup #:line (#:halign -0.5 #:musicglyph "scripts.trill" 
#:teeny
#:raise 0.5 #:flat)) "")
        g2.\startTrillSpan g4.\stopTrillSpan a d a4.\trill a4~( a16 b32 cis) d4.
}}
         \score {
                \new Staff << \global \violinOne >>
         }