F                                                                        [100%]
=================================== FAILURES ===================================
____________________________________ test_l ____________________________________
test_hl.py:5: in test_l
    check(["a.py"])
mylib/lint.py:3: in check
    assert problems == [], problems
           ^^^^^^^^^^^^^^
E   AssertionError: ['foo.py:3: E501 line too long']
1 failed in 0.01s
