We were seeing these failures in the nightly builds:
```
FAILED tests/test_arcs.py::LoopArcTest::test_continue - AssertionError:
Possible arcs differ: minus is expected, plus is actual
(-1, 1) # .1
(1, 2) # 12
(1, 5) # 15
(2, 3) # 23
(3, 1) # 31
- (4, 1) # 41
(5, -1) # 5.
Missing arcs differ: minus is expected, plus is actual
- (4, 1) # 41
+
assert False
FAILED tests/test_arcs.py::LoopArcTest::test_break - AssertionError:
Possible arcs differ: minus is expected, plus is actual
(-1, 1) # .1
(1, 2) # 12
(1, 5) # 15
(2, 3) # 23
(3, 5) # 35
- (4, 1) # 41
(5, -1) # 5.
Missing arcs differ: minus is expected, plus is actual
(1, 5) # 15
- (4, 1) # 41
assert False
FAILED tests/test_arcs.py::ExceptionArcTest::test_raise_followed_by_statement - AssertionError:
Possible arcs differ: minus is expected, plus is actual
(-1, 1) # .1
(1, 2) # 12
(2, 3) # 23
(3, 4) # 34
(4, 6) # 46
- (5, 8) # 58
(6, 7) # 67
(7, 8) # 78
(8, -1) # 8.
Missing arcs differ: minus is expected, plus is actual
- (5, 8) # 58
+
assert False
FAILED tests/test_coverage.py::SimpleStatementTest::test_raise_followed_by_statement - AssertionError: [1, 2, 4, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 4, 5] == [1, 2, 3, 4, 5]
At index 2 diff: 4 != 3
Right contains one more item: 5
Full diff:
- [1, 2, 3, 4, 5]
? ---
+ [1, 2, 4, 5]
FAILED tests/test_coverage.py::SimpleStatementTest::test_break - AssertionError: [1, 2, 3, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 3, 5] == [1, 2, 3, 4, 5]
At index 3 diff: 5 != 4
Right contains one more item: 5
Full diff:
- [1, 2, 3, 4, 5]
? ---
+ [1, 2, 3, 5]
FAILED tests/test_coverage.py::SimpleStatementTest::test_continue - AssertionError: [1, 2, 3, 5] != [1, 2, 3, 4, 5]
assert [1, 2, 3, 5] == [1, 2, 3, 4, 5]
At index 3 diff: 5 != 4
Right contains one more item: 5
Full diff:
- [1, 2, 3, 4, 5]
? ---
+ [1, 2, 3, 5]
```