E741: Inconsistent behavior for lambdas

[knkski]

It seems like E741 shouldn't apply to variable names inside of comprehensions, due to the limited scope of such variables. If that's the desired behavior anyways, this behavior seems inconsistent to me:

# flagged as lint
foo = [l for l in lines if l]

# not flagged as lint
foo = list(filter(lambda l: l, lines))