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It often happens that the tests fail first and then pass
when rerun; it is not that clear why that happens. In many
cases, this has turned out to be a consequence of the
sequence in which the tests are run, where earlier tests
"break" some state information to let later tests fail.

It should be possible to enhance regrtest/unittest to keep
more information about a failure, e.g. which specific test
method failed. This might give a clue in cases like this.