Bug report

Bug description:

from contextlib import suppress

class FooException(Exception): ...

class FooExceptionGroup(ExceptionGroup[Exception]): ...

try:
    with suppress(FooException):
        raise FooExceptionGroup("", [Exception()])
except ExceptionGroup as e:
    print(type(e))

in this code, the suppress context manager is expected to have no effect, as a FooException is not being raised within it. instead, it gets converted to an ExceptionGroup then re-raised.

expected output:

<class '__main__.FooExceptionGroup'>

actual output:

<class 'ExceptionGroup'>

CPython versions tested on:

3.12

Operating systems tested on:

Windows

Linked PRs

• gh-119287: clarify doc on BaseExceptionGroup.derive and link to it from contextlib.suppress #119657
• [3.13] gh-119287: clarify doc on BaseExceptionGroup.derive and link to it from contextlib.suppress (GH-119657) #120105
• [3.12] gh-119287: clarify doc on BaseExceptionGroup.derive and link to it from contextlib.suppress (GH-119657) #120106