assert line in analysis.missing since coverage 7.6.2

[sajith]

Describe the bug

Running python -m coverage lcov -o coverage.lcov used to work just fine until coverage 7.6.1:

$ python -m coverage --version 
Coverage.py, version 7.6.1 with C extension
Full documentation is at https://coverage.readthedocs.io/en/7.6.1
$ python -m coverage lcov -o coverage.lcov
Wrote LCOV report to coverage.lcov

This doesn't work since 7.6,2:

$ pip install coverage==7.6.7
$ python -m coverage lcov -o coverage.lcov
Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/__main__.py", line 10, in <module>
    sys.exit(main())
             ^^^^^^
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/cmdline.py", line 970, in main
    status = CoverageScript().command_line(argv)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/cmdline.py", line 743, in command_line
    total = self.coverage.lcov_report(
            ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/control.py", line 1277, in lcov_report
    return render_report(self.config.lcov_output, LcovReporter(self), morfs, self._message)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/report_core.py", line 62, in render_report
    ret = reporter.report(morfs, outfile=outfile)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/lcovreport.py", line 189, in report
    self.lcov_file(fname, fr, analysis, outfile)
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/lcovreport.py", line 221, in lcov_file
    lcov_arcs(fr, analysis, lines, outfile)
  File "/path/to/project/.venv/lib64/python3.12/site-packages/coverage/lcovreport.py", line 124, in lcov_arcs
    assert line in analysis.missing
           ^^^^^^^^^^^^^^^^^^^^^^^^
AssertionError

To Reproduce
How can we reproduce the problem? Please be specific. Don't link to a failing CI job. Answer the questions below:

1. What version of Python are you using?

Python 3.9, 3.10, 3.11, and 3.12.

1. What version of coverage.py shows the problem? The output of coverage debug sys is helpful.

Since coverage 7.6.2 up to the latest 7.6.7.

1. What versions of what packages do you have installed? The output of pip freeze is helpful.

absl-py==2.1.0
backports-datetime-fromisoformat==1.0.0
black==24.10.0
cffi==1.15.0
click==8.1.7
contourpy==1.3.1
coverage==7.6.7
cycler==0.12.1
dataclasses-json==0.6.7
et_xmlfile==2.0.0
fonttools==4.55.0
grenml==1.0.0
immutabledict==4.2.1
iniconfig==2.0.0
isort==5.13.2
kiwisolver==1.4.7
lxml==4.9.4
marshmallow==3.23.1
matplotlib==3.9.2
mip==1.14.2
mypy-extensions==1.0.0
networkx==3.4.2
numpy==2.1.3
openpyxl==3.1.5
ortools==9.11.4210
packaging==24.2
pandas==2.2.3
pathspec==0.12.1
pillow==11.0.0
platformdirs==4.3.6
pluggy==1.5.0
protobuf==5.26.1
prtpy==0.8.3
pycparser==2.22
pydot==3.0.2
pyparsing==3.2.0
pytest==8.3.3
pytest-cov==6.0.0
pytest-sugar==1.0.0
python-dateutil==2.9.0.post0
pytz==2024.2
ruff==0.0.285
scipy==1.14.1
sdx-datamodel @ git+https://github.com/atlanticwave-sdx/datamodel@d9ac85a9fdd1c87aedc56001859fc5fe543b365a
-e git+https://github.com/atlanticwave-sdx/pce@eb64f3f93fe90e16a5da80b75ce44de0e9f4f6ff#egg=sdx_pce
six==1.16.0
termcolor==2.5.0
typing-inspect==0.9.0
typing_extensions==4.12.2
tzdata==2024.2

1. What code shows the problem? Give us a specific commit of a specific repo that we can check out. If you've already worked around the problem, please provide a commit before that fix.

I am trying to send coverage report in LCOV format to coveralls.io from https://github.com/atlanticwave-sdx/pce (please excuse the prototype-iness), and running python -m coverage lcov -o coverage.lcov from CI jobs fails with a backtrace, as described above. This is reproducible in a local setup also. This library uses a dependency with a C extension (ortools), and I suspect that could be the problem, because other "pure" Python projects I work on are not affected.

Using coverage 7.6.1 is the workaround.

1. What commands should we run to reproduce the problem? Be specific. Include everything, even git clone, pip install, and so on. Explain like we're five!

Do this (assuming bash and Linux):

$ git clone https://github.com/atlanticwave-sdx/pce
$ cd pce
$ python3.12 -m venv .venv --upgrade-deps
$ source .venv/bin/activate
$ pip install tox
$ tox
$ python -m coverage lcov -o coverage.lcov

Expected behavior

Coverage should be able to produce an LCOV file without crashing.

Additional context

Unsure, sorry!

[nedbat]

Thanks, I can reproduce the problem. Now to understand why...

[sajith]

@nedbat Thank you for looking into this. Just a heads-up, in case you need to use the repository in question again: I just merged a work-around (which is: using coverage 7.6.1) in the main branch there.

[nedbat]

A simple case, and the HTML report shows confusion about it too:

[vser1]

Note also that the assert fires on

for i in(1, 2, 3, 4):
    if True or False:
        print("foo")
    continue

(see #198)
As the continue is not marked as covered and the assert fails.

[nedbat]

Fixed in commit 2ace7a2.

[nedbat]

This is now released as part of coverage 7.6.8.