invalid-length-hint-returned:38:4:FirstBadLengthHint.__length_hint__:__length_hint__ does not return non-negative integer
invalid-length-hint-returned:45:4:SecondBadLengthHint.__length_hint__:__length_hint__ does not return non-negative integer
invalid-length-hint-returned:52:4:ThirdBadLengthHint.__length_hint__:__length_hint__ does not return non-negative integer
