out of memory, rollback not good?

[rupert.thurner]

because somebody posted on the users mailing list that cloning the gcc
ssh repository is impossible as it gets an error, i was curios and i
tried.

hg clone svn://gcc.gnu.org/svn/gcc/trunk gcc
...
[r143562] dodji: Reverted commit 143546 related to PR c++/26693
transaction abort!
rollback completed
abort: out of memory

besides that mercurial is fife times slower than git in that case, it
gets an out of memory error. and, there is no leftover "gcc" folder,
which i thought is there until the revision 143562. which would allow
to continue with a pull until the next error.

the concerning diff is not especially big:
svn diff -r143560:143562 http://gcc.gnu.org/svn/gcc/trunk

what is so special with this clone that there is no leftover to
continue?

rupert.