from __future__ import annotations


class ExceptionGroup(Exception):
    """Minimal backport used by bundled libs on Python < 3.11."""

    def __new__(cls, message, exceptions):
        obj = super().__new__(cls, message)
        obj.message = message
        obj.exceptions = tuple(exceptions)
        return obj

    def __init__(self, message, exceptions):
        super().__init__(message)
        self.message = message
        self.exceptions = tuple(exceptions)

    def derive(self, exceptions):
        return self.__class__(self.message, exceptions)