\alternative *inside* \repeat in LilyPond

[Peter Chubb]

Hi,
        I want to write some music that has the structure:

        Intro
        \repeat 4 { Chorus [first-ending] verse }
        fifth-ending final

        The obvious:

        \repeat 4 { Chorus \alternative{{first-ending}{}} verse}
        \alternative{{}{fifth-ending}}
        final

        doesn't work.

        And the (logically correct but ugly)

        \repeat 4 {Chorus}
        \alternative {{first-ending verse}{fifth ending}}
        final

        is very ugly, because the volta bracket keeps going for so
        long.

        Peter C