Stabilize dev-vcs/mercurial-1.6.3.
As I have already said (https://bugs.gentoo.org/show_bug.cgi?id=314945#c13), src_test on amd64 fails, but succeeds if tests are run with -j1: "$(PYTHON)" run-tests.py --tmpdir="${testdir}" instead of current "$(PYTHON)" run-tests.py -j4 --tmpdir="${testdir}" Taking into account that tests fail on mq extension, I suppose failing test could rely on athother one run earlier, which is being executed in parallel with -j4. Please stabilize Mercurial on amd64 too!
Me and Dirkjan are planning on getting 1.7 stabilized soon.