class Flaky(_Trimmable):
    """Base class for indeterministic failures. Usually one of the more
    specific subclasses (FlakyFailure or FlakyStrategyDefinition) is raised."""


class FlakyReplay(Flaky):
    """Internal error raised by the conjecture engine if flaky failures are
    detected during replay.

    Carries information allowing the runner to reconstruct the flakiness as
    a FlakyFailure exception group for final presentation.
    """

    def __init__(self, reason, interesting_origins=None):
        super().__init__(reason)
        self.reason = reason
        self._interesting_origins = interesting_origins

class FlakyFailure(ExceptionGroup, Flaky):
    """This function appears to fail non-deterministically: We have seen it
    fail when passed this example at least once, but a subsequent invocation
    did not fail, or caused a distinct error.

    Common causes for this problem are:
        1. The function depends on external state. e.g. it uses an external
           random number generator. Try to make a version that passes all the
           relevant state in from Hypothesis.
        2. The function is suffering from too much recursion and its failure
           depends sensitively on where it's been called from.
        3. The function is timing sensitive and can fail or pass depending on
           how long it takes. Try breaking it up into smaller functions which
           don't do that and testing those instead.
    """

    def __new__(cls, msg, group):
        # The Exception mixin forces this an ExceptionGroup (only accepting
        # Exceptions, not BaseException). Usually BaseException is raised
        # directly and will hence not be part of a FlakyFailure, but I'm not
        # sure this assumption holds everywhere. So wrap any BaseExceptions.
        group = list(group)
        for i, exc in enumerate(group):
            if not isinstance(exc, Exception):
                err = _WrappedBaseException()
                err.__cause__ = err.__context__ = exc
                group[i] = err
        return ExceptionGroup.__new__(cls, msg, group)