I have always used ASDF:*CENTRAL-REGISTRY*, with some local code that grovels over source trees. I'd love to stop maintaining the tree groveler, and move to the DSL, but I have never understood how you debug the DSL when ASDF fails to find your system. With *CENTRAL-REGISTRY* you pretty much pprint the variable, eyeball it, and it's usually pretty easy to see whether a directory is missing. But what do you do if you use the DSL? The last time I tried to use the DSL, I found myself using the inspector to grovel over internal-to-ASDF hash tables, which wasn't very pleasant. Is there a "debugger API" to the new source configuration search? E.g., can we dump the hash-table in a human readable (sorted, formatted way?)? can we trace something to see how ASDF is populating the hash table? cheers, r