@gothnbass@linuxrocks.online
> Versioned dependencies were absent for a long time but added in v3, if I'm reading the docs correctly

You're right. At first I thought it was some recent addition, but it just turned out it was in a section where I wasn't expecting to find it. I assumed it would've been mentioned when describing defsystem's syntax and the :depends-on option.

> My thinking around build tests is less that they're needed, and more that they'd be useful.

My first reaction was to leave that to ASDF and the package developers, and then have some system in place to let users complain if they were given the wrong info, but that's clearly not optimal. Build tests make much more sense. I wonder how costly would implementing that be, though.

@louis@emacs.ch