Please file a bug so this will not happen again and also cc nathan
on the bug because it is his bug.
The point of my message was less to point out this specific bug, but to
note that we have some quality problems (which might indicate serious
weaknesses in our testsuites or the default options used there).
I know from others, who volunteer as guinea pigs by building GCC and
testing it against their sources on a daily base, that recently the
situation has been worse than during the last months (apart from a
few days after the merger of the new C++ parser where this was to be
expected).
As I said, this may be partly due to testsuite problems.