Thanks for bringing this up!

asdf-build-system/source should turn its inputs into propagated inputs
so that it does what the users want.

I guess we just need to fix the build system.

What about other build systems?

For instance, installing an sbcl package will not drag the source of its
dependents, which could be considered a bug.

Thoughts?

-- 
Pierre Neidhardt
https://ambrevar.xyz/