thread 'test_frequency::prop_frequency_indexed' panicked at '[quickcheck] TEST FAILED (runtime error). Arguments: (CsvData { data: [[[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[]], [[239, 187, 191]]] })
Error: "assertion failed: `(left == right)`\n left: `[(\"(NULL)\", 60)]`,\n right: `[(\"(NULL)\", 60), (\"\\u{feff}\", 1)]`"', /cargo/registry/src/github.com-1ecc6299db9ec823/quickcheck-0.7.1/src/tester.rs:176:28
#99420 failed twice with the exact same error in xvt (part of cargotest), but the third attempt worked fine. I have not checked whether this happened to other PRs, but it seems somewhat concerning.
The error is thousands of lines long and ends in
(but there is more than one assertion failure here)