I would like to have a **list of all the tests that have failed** to be used **at the end of session**.

Pytest lets you define a hook `pytest_sessionfinish(session, exitstatus)`, that is called at the end of the session, where I wish to have that list. 

`session` is a `_pytest.main.Session` instance that has the attribute `items` (type `list`), but I couldn't find whether the each `item` in that list passed of failed.

1. How can a list of all failed tests could be retrieved at the end of the session?
2. How can it be done while using `pytest-xdist` plugin, where I would like to get that list in the master process. Using this plugin, `session` does not even have `items` attribute in the master:

```py
def pytest_sessionfinish(session, exitstatus):
    if os.environ.get("PYTEST_XDIST_WORKER", "master") == "master":
         print(hasattr(session, "items"))  # False

```