Strange behavior when superclass is an unknown argument

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#1,069 4 comments 0 reactions 0 assignees View on GitHub

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Assessment

Difficulty
4/5
Estimated time
3-5 days
Newbie friendliness
30/100
Issue type
Bug
Clarity
Mostly clear
Activity status
Stale
Tech stack
python
Domain
devtools

Research direction

Start by reproducing both examples from the issue and compare how annotating cls as Any affects the errors for the class base and super() call. Done means the intended handling of an unknown superclass is established and covered for both forms, with the reported inconsistent diagnostics resolved.

Written by the indexing model from the issue text.

Description

bug false-positive priority-1-normal topic-inheritance

Forking this issue from #1067. Example:

def outer(cls):
    class C(cls):  # E: Invalid type "cls"
        def meth(self):
            super(C, self).meth()  # E: "meth" undefined in superclass

Neither error goes away when I annotate the 'cls' argument as having type 'Any'. Also interesting: this gives the same two errors:

cls = ...
class C(cls):  # E: Invalid type "cls"
    def meth(self):
        super(C, self).meth()  # E: "meth" undefined in superclass

but here annotating 'cls' as type 'Any' does make the errors disappear.

Dominant language
Python
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