Describe the bug
When an async for loop contains a conditional break from the loop, and the whole loop is inside a try.. finally block (the except clause may also be present), it manifests as missing branch coverage under CPython 3.14.0b4. The branch is correctly covered under CPython 3.12.x.
This bug is very similar to #1324 (affects CPython 3.10), so I used almost the same file to reproduce. However, the loop now needs to be inside a try.. finally block to trigger.
To Reproduce
How can we reproduce the problem? Please be specific. Don't link to a failing CI job. Answer the questions below:
What version of Python are you using?
CPython 3.14.0b4
What version of coverage.py shows the problem? The output of coverage debug sys is helpful.coverage_version: 7.9.2
What versions of what packages do you have installed? The output of pip freeze is helpful.
Only coverage==7.9.2.
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.
import asyncio
class CoverMe:
def __init__(self, number):
self._number = number
async def _async_range(self):
for n in range(self._number):
yield n
async def do_something(self):
accumulated = 0
try:
async for n in self._async_range():
accumulated += n
if accumulated > 10:
break
finally:
print('Whoa, finally done.')
return accumulated
async def main():
print(await CoverMe(1).do_something())
print(await CoverMe(3).do_something())
print(await CoverMe(10).do_something())
if __name__ == '__main__':
asyncio.run(main())
git clone, pip install, and so on. Explain like we're five!async for loop w/ break (CPython 3.10.2) #1324 for .coveragerc.)$ coverage erase && coverage run example.py && coverage report
Whoa, finally done.
0
Whoa, finally done.
3
Whoa, finally done.
15
Name Stmts Miss Branch BrPart Cover Missing
------------------------------------------------------
cover.py 22 0 8 2 93% 16->22, 33->exit
------------------------------------------------------
TOTAL 22 0 8 2 93%
Expected behavior
The same run on CPython 3.12:
Name Stmts Miss Branch BrPart Cover Missing
--------------------------------------------------------
example.py 22 0 8 1 97% 33->exit
--------------------------------------------------------
TOTAL 22 0 8 1 97%
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