Strange bug, guix can't find gfortran-toolchain even though it is a
package defined publicly in one of the files it presumably searches.
`which guix` outputs the expected "$HOME/.config/guix/current/bin/guix",
so it probably isn't a problem with my guix home.
`guix package -A gfortran` returns nothing.
`guix package -A gcc-toolchain` shows several different versions of
gcc-toolchain in gnu/packages/commencement.scm
`guix edit gcc-toolchain` opens the source where guix presumably found
the gcc-toolchain package definition. Within that file,
gfortran-toolchain is defined publicly.
This is also the case for gdc-toolchain.
`guix describe`:
repository URL: https://git.savannah.gnu.org/git/guix.git
branch: master
commit: 8bfb1258d32b5ffeeefd9d44753b87f62bdbf822
