pytype

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Sorry if that's a known issue.

This code

def visit_goals(lst, f):
    for x in lst:
        f(x)

goals = set()
visit_goals([], lambda g: goals.add(g))

def foo():
    return [1, 2, 3]

goals = foo()
for g in goals:
    print(g)

causes pytype 2020.4.22 to emit

<lambda>: No attribute 'add' on List[int] [attribute-error]

Oh interesting. I guess since we analyze the lambda after we finish executing the module-level code, we think goals is a list at that point.

The easiest workaround would be to use a different name for the second variable.

Yup, that would fix my particular case.