internal error: EVACUATED object entered!

During 'make test' of pugs (http://pugscode.org/) which
is written in Haskell I got this error:

...
...
t/oo/construction..................................ok
        6/7 TODO feature tests
t/oo/delegation....................................ok
        24/34 TODO feature tests
t/oo/destruction...................................ok
6/6# Looks like you failed 2 tests of 6
pugs: internal error: EVACUATED object entered!
    Please report this as a bug to
glasgow-haskell-bugs@haskell.org,
    or http://www.sourceforge.net/projects/ghc/
t/oo/destruction...................................dubious
        Test returned status 254 (wstat 65024, 0xfe00)
DIED. FAILED tests 4-5
        Failed 2/6 tests, 66.67% okay
t/oo/enums.........................................ok
        54/58 TODO feature tests
...
...


I have:
* GHC 6.4
* pugs r4916
* (no parrot)
* SuSe 9.1
* "uname -a" gives "Linux markus 2.6.5-7.155.29-default
#1 Thu Jun 2 12:07:05 UTC 2005 i686 athlon i386 GNU/Linux"