Vertical positioning of rehearsal mark and repeat alternative

[Nick Payne]

With a rehearsal mark on the barline that ends a repeat alternative, how 
do I position the mark immediately above the barline and below the volta 
bracket? I've tried playing around with the outside-staff-priority of 
various objects such as VoltaBracket, TextScript, and RehearsalMark 
without being able to move the mark below the bracket.

\version "2.15.42"
\relative c'' {
    \repeat volta 2 { c1 c }
    \alternative {
        { c }
        { c    }
    }
    \mark\markup\normalsize { \musicglyph #"scripts.coda" }
    c
}