The following 'test.py' produces a crash with the unix port. In this example, we clear the dic when defining the dic, then micropython crashes.

test.py

class S(str):

    def __eq__(self, other):
        d.clear()

    def __hash__(self):
        return hash('test')

d = {S(): 'value'}
'test' in d

Error message:

Floating point exception (core dumped)

The expected output: work well (behavior on CPython 3.10.8)

how to replicate it:

1. install micropython (unix port)
2. run it with unix port

3. ->> 'micropython/ports/unix/build-standard/micropython' test.py

Environment
compiler versions: MicroPython v1.19.1-724-gfb7d21153 on 2023-03-07; linux [GCC 7.5.0] version
operating system: Ubuntu 18.04.6 LTS