Mac OS X version 10.5 or later is required for zerocost-exceptions???

FROM : Jurgen Vermeiren
DATE : Thu Feb 07 21:57:39 2008

This strange error message has appeared before the closing brace of a
synchronized statement when I switched the deployment target to Tiger in
my project settings.

The block may be empty, the error won't go. I have a similar synchronized
block elsewhere in another method but XCode does not complain about that
one. So what's wrong?

Jurgen