[bug#49965] Correct Input type for Common Lisp packages

[Charles]

Thanks so much! that is some really good information. It seems al the features 
are present already, so this ticket can be closed.

I think it would be nice to have this part in the manual though:

In other words, this works:

  guix environment --ad-hoc sbcl sbcl-cl-str --
    sbcl --eval '(require :asdf)' --eval '(asdf:load-system "str")'