[issue32899] Not documented: key in dict test may raise TypeError

[INADA Naoki]

INADA Naoki <songofacandy at gmail.com> added the comment:

We have it already:

https://docs.python.org/3/library/stdtypes.html#mapping-types-dict

> A dictionary’s keys are almost arbitrary values. Values that are not hashable, that is, values containing lists, dictionaries or other mutable types (that are compared by value rather than by object identity) may not be used as keys.

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue32899>
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