Issue

Coverage.py runs nightly tests against the tip of CPython. They are currently failing, for example: https://github.com/nedbat/coveragepy/actions/runs/18817804320/job/53688688813#step:9:54

The problem seems to be that virtualenv doesn't have the right details for 3.15, so it uses the wrong pip.

Environment

Provide at least:

• OS:

• Shell:

• Python version and path:

• pip list of the host python where virtualenv is installed:

Output of the virtual environment creation

Make sure to run the creation with -vvv --with-traceback: