Stackage importer change breaks tests/lint, build

Dear Guix-Maintainers,

first of all -- thanks for putting that much work into guix! For the

past 3 years it has been my libre-distro of choice at home. At work I

don't have it on production machines yet, but that's mainly because I'm

serving Debian-Jupyterhubs in our lab -- and haven't gotten the hubs

working on Guix due to it's rather hefty npm-global and conda (nice for

the end-user) dependencies. But that's work in progress.

Right now I just tried to build guix on a guix-vm, but the 'make check'

fails at lint.scm -- attached you find the build-log. The main reason

for my build-attempt is to have nicer integration, once I got jupyterhub

going, and to get some training on 'pre-install-env'.

Best,

Daniel

retitle 50870 Stackage importer change breaks tests/lint, build

merge 50870 50871

thanks