Combine \default rehearsal mark with another mark

[Siska Ádám]

Dear List,


I'd like to put two rehearsal marks over the same barline. However, this gives 
an error:

\mark \markup{
   \center-align{
      \line{ \default }
      \line{ "8" }
   }
} s4*8

The error is: 'error: syntax error, unexpected \default'

I also tried to access the value of \default, however, I couldn't find out how 
to do that. The documentation says: 'The value to use is stored in the property 
rehearsalMark', however, I didn't find any property like 
RehearsalMark.rehearsalMark nor Score.rehearsalMark, or at least I didn't find 
out how to access these in a \markup block.

Do you have any suggestion for this?


Thanks,
Ádám