Adding

interpreter_constraints

to some tool config sections in

pants.toml

results in the following error only in macOS, not Linux (a self-built version) -- where both platform uses 2.12.0 and pex 2.1.99. Am I missing something...?:

Yeah, not all tools register the

--interpreter-constraints

option. Not sure why, @hundreds-father-404 do you recall why this is optional and not standard for every tool? But very surprising that linux doesn't error too.

Because some tools use the ICs of the code they run, which impacts the behavior. Running Flake8 w/ Python 2 results in different behavior than running w/ Python 3. So, Pants runs w/ the code's constraints, rather than an option