segno above rehearsal mark

[Tao Cumplido]

Hi list,

I need to put a segno mark on top of one rehearsal mark but lily doesn't allow 
two marks at the same spot so I searched LSR and came across this
http://lsr.dsi.unimi.it/LSR/Item?id=202

unfortunately it doesn't work with 2.11.62 and I am not really good at scheme 
so I can't figure out why.
It'd be great if somone more skilled at scheme could fix this.

regards,

Tao
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