Files
RustPython/Lib/test
Luan Taraschi 782d5d2639 Warn instead of aborting when a class namespace holds a non-string key (#8581)
* Warn instead of aborting when a class namespace holds a non-string key

type() took the whole process down when the namespace it was handed had
a key that was not an exact str:

    >>> type("MyClass", (), {1: 2})
    thread 'main' panicked at crates/vm/src/builtins/dict.rs:781:65:
    dict has non-string keys: [PyObject PyInt { value: 1 }]

to_attributes called expect() on downcast_exact, so a str subclass hit
the same line, and that one names an attribute as well as a str does.
PyAttributes is keyed by interned strings and can hold nothing else, so
a str subclass is now interned like any other name, and a key that is no
kind of string is skipped, with the caller deciding what the skip means.
type() warns once per class, the way CPython does, and
_thread.start_new_thread raises the TypeError an ordinary call already
raises for the same mapping.

The key itself still does not land in the class dict, which is what
test_type_lookup_mro_reference needs, so that one stays skipped with the
reason rewritten.

Assisted-by: Claude Code:claude-opus-5

* Mark test_type_lookup_mro_reference as an expected failure

It aborted the runner before, which is why it was skipped. Now that it
only fails, the run can carry it: five runs in a row report it as an
expected failure, and it cannot turn into a pass while the class dict
drops the key its lookup needs.

Assisted-by: Claude Code:claude-opus-5
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