I don't see this with Windows XP, VC++ 8.0, VC++ 9.0 or MinGW GCC 3.4.2, using Parrot r26446. All three nmake/mingw32-make test in languages/perl6 report:
All tests successful. Files=27, Tests=223, 37 wallclock secs ( 0.13 usr + 0.00 sys = 0.13 CPU) Result: PASS The GC bug is either solved or well hidden again. I'm closing this ticket. Please reopen if issue can be reproduced. Thanks, Ron