Failure when trying to call __repr__ because __iter__ is called? #7966
Description
1. Problem
The following code
class A:
def __iter__(self):
raise ValueError()
def __eq__(self, o: object) -> bool:
return self is o
def test_a():
assert A() == A()...will throw:
def test_a():
> assert A() == A()
E assert <tests.test_p...0019C132F1490> == <tests.test_p...0019C132F12B0>
E (pytest_assertion plugin: representation of details failed: XXX\test_pp.py:3: ValueError.
E Probably an object has a faulty __repr__.)
...because __iter__ is called in order to repr() the object?
Is there a way to avoid __iter__ being called when a test fails?