Ouch, I can't use srfi-64 test-group inside asyncronous code, because it uses dynamic-wind and re-entering fiber's continuation messes up test-runner output:

https://git.savannah.gnu.org/cgit/guile.git/tree/module/srfi/srfi-64/testing.scm?h=0e9ccaf47#n443

#scheme #lisp

https://cdn.fosstodon.org/media_attachments/files/111/023/210/400/313/573/original/8943a85a9df6bff3.png