slime meta-dot in ASDF sources

[Mark H. David]

How do ASDF developers using emacs with SLIME deal with doing meta-dot (meta-.) 
on function names in ASDF sources. Out of the box, mostly when I meta-. just 
goes to one big top-level form that starts like this

  (with-upgradability ()
    (define-condition invalid-source-registry (invalid-configuration warning)

Thanks for clues,
-Mark