Description
it would by nice if the image could be globally sideeffected once (e.g. by installing an ASDF hook), and then later on any missing system would invoke quicklisp to attempt to download it.
using a toplevel ql:quickload call is convenient in most use-cases, but sometimes we cannot modify/customize some code deep down somewhere to call quickload, especially if we want to keep quicklisp optional.
example use case: a build.sh script that works both on a completely fresh linux install, and also in the customized environment of a developer, where it's only downloading from ql that which is not already installed/modified in the developer's environment.
there's a lengthy discussion about the technical details of this at #122 (comment). see this comment/discussion for a sketch of such a *system-definition-search-functions* hook.