vf upgrade: ‘sed’ cannot find [an undisclosed] file

[Klaus Alexander Seistrup]

• I am using Fish shell version 3.1 or higher.
• I am using Python version 3.6 or higher.
• I have searched the issues (including closed ones) and believe that this is not a duplicate.
• If related to a plugin, I prefixed the issue title with the name of the plugin.

• OS version and name: Rolling ArchLinux
• Fish shell version: 3.5.1
• VirtualFish version: 2.5.5

Issue

TL;DR: vf upgrade fails with “sed: can't read : No such file or directory” and I have no idea which file vf is talking about.

I have exactly one virtual environment, toot, that holds the newest version on the PyPI package by the same name.

$ cat ~/.virtualenvs/global_requirements.txt
pip
wheel
setuptools

When I attempted to upgrade the envuironment, all I got was an unhelpful error:

$ vf upgrade toot
Upgrading toot from 3.10.8 to 3.10.8
sed: can't read : No such file or directory

I'm unsure how to proceed.