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try-else + with + branch = true with sysmon results in false negative #2289
Description
Describe the bug
the combination of things in the title results in coverage treating a line as covered when it is most certainly not! the toy example below is minimized from this file here
To Reproduce
I am using coverage 7.16.1 (with no config) on linux x86_64 -- all pythons below are on the latest released patch version where not specified
import contextlib
def main():
raise SystemExit()
def example():
try:
with contextlib.ExitStack():
main()
except SystemExit as e:
return 1
else:
raise RuntimeError('!!!') # incorrectly covered with sysmon!
example()in python 3.14 and above I get the following (incorrect) output (notice line 13 is incorrectly marked as covered):
$ venv314/bin/coverage erase
$ venv314/bin/coverage run --branch t.py
$ venv314/bin/coverage report --show-missing --include t.py
Name Stmts Miss Branch BrPart Cover Missing
---------------------------------------------------
t.py 11 0 0 0 100%
---------------------------------------------------
TOTAL 11 0 0 0 100%Expected behavior
in python 3.13 and below I get the following (correct) output:
$ venv313/bin/coverage erase
$ venv313/bin/coverage run --branch t.py
$ venv313/bin/coverage report --show-missing --include t.py
Name Stmts Miss Branch BrPart Cover Missing
---------------------------------------------------
t.py 11 1 0 0 91% 13
---------------------------------------------------
TOTAL 11 1 0 0 91%
Additional context
found while debugging pyflakes coverage
Activity
nedbat commentedon Sep 26, 2026
This is fixed in commit 8ad7236.
nedbat commentedon Sep 27, 2026
This is now released as part of coverage 7.16.2.
Bump coverage from 7.16.1 to 7.16.2 (#94)