Stress tests failing with RAKUDO_RAKUAST=1

gistfile1.txt

dilbert@dilbert-VirtualBox:~/repos/rakudo$ RAKUDO_RAKUAST=1 ./rakudo-m -Ilib t/spec/S02-types/version-stress.t
===SORRY!=== Error while compiling t/spec/S02-types/version-stress.t
Cannot hyper this postfix
at t/spec/S02-types/version-stress.t:41

dilbert@dilbert-VirtualBox:~/repos/rakudo$ RAKUDO_RAKUAST=1 ./rakudo-m -Ilib t/spec/integration/advent2012-day04.t
===SORRY!=== Error while compiling t/spec/integration/advent2012-day04.t
Calling elems() will never work with signature of the proto ($, *%)
at t/spec/integration/advent2012-day04.t:26

dilbert@dilbert-VirtualBox:~/repos/rakudo$ RAKUDO_RAKUAST=1 ./rakudo-m -Ilib t/spec/6.c/MISC/bug-coverage-stress.t
1..14
# Subtest: no deadlock while acquiring mutex
    1..2
    ok 1 - program did not hang
    ok 2 - STDOUT
ok 1 - no deadlock while acquiring mutex
ok 2 - Supply.merge on signals does not crash
ok 3 - Supply.merge on signals does not crash
ok 4 - Supply.merge on signals handles signal
ok 5 - dir() does not produce wrong results under concurrent load
ok 6 - no issues when piping one Proc's STDOUT to another's STDIN
ok 7 - supply inside sock does not hang
not ok 8 - no serialization crashes with roles and traits
# Failed test 'no serialization crashes with roles and traits'
# at t/spec/6.c/MISC/bug-coverage-stress.t line 162
#      got status: 1
#      got out: ""
# expected out: "pass"
#      got err: "===SORRY!===\nMissing serialize REPR function for REPR MVMContext (BOOTContext)\n"
# expected err: ""
...