`(asdf:defsystem ,(something-to-make-my-system-name) :description "blah" … )

and now the asdf:defsystem symbol is coming out as asdf/defsystem:defsystem instead, 

which makes the .asd file non backwards-compatible with slightly older asdf versions,

because (symbol-package 'asdf:defsystem) --> #<The asdf/defsystem package>

So the Question is, what is the best way to get asdf:defsystem to print as asdf:defsystem, 

when its home package is :asdf/defsystem and apparently it is now just re-exported from :asdf.

Or should this symbol now be officially printed as asdf/defsystem:defsystem ? 

Or should I put some (in-package ...) statement at the top of the .asd file, and use plain defsystem with no package prefix? 

Of course I think for the time being the .asd file should be compatible with all ASDF versions from recent history...