[racket-dev] read-marshalled: reader for splice-sequence-type not implemented?

I'm getting an error in the 5.1.1.900 branch when trying to zo-parse a
file.  Here's the error I'm seeing:


----------------------------------------------------------------------------------------------------------------------
 read-marshalled: reader for splice-sequence-type not implemented

 === context ===
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:496:0: read-marshalled
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:733:2: loop
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:733:2: loop
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:733:2: loop
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:733:2: loop
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:496:0: read-marshalled
/home/dyoo/local/racket/collects/compiler/zo-parse.rkt:994:0: core
----------------------------------------------------------------------------------------------------------------------


Will this be fixed before the 5.1.2 release?  My Whalesong project
depends intimately on compiler/zo-parse.  Are there other things in
compiler/zo-parse that I should look out for?