On Thu, Jul 30, 2020 at 12:15:56AM +0200, Ricardo Wurmus wrote: > “Unbound variable: ~S” looks like a format string with a placeholder > that didn’t get replaced with an actual value. It would be marginally > better if it said “Unbound variable: avr-toolchain”.
The reason I suggested an interface change being responsible for "Unbound variable: ~S" is that I noticed it a couple days ago after changes to (guix ui), and it was fixed by `make clean-go`: http://logs.guix.gnu.org/guix/2020-07-27.log#015055 I think that error message is an example of what can go wrong when using a development environment without rebuilding everything first.
