This is an issue with how ASDF parses systems, one of the few parts that ASDF still does mostly the same way that ASDF 1 did. Can you open a bug on launchpad? You're not the first to mention this bug in error handling. I suppose the correct thing to do without a big refactoring would be to either have a successfully-parsed-p flag in the system that is checked at opportune moments, or to have a unwind-protect somewhere to de-register the system if it was incorrectly parsed. —♯ƒ • François-René ÐVB Rideau •Reflection&Cybernethics• http://fare.tunes.org Your conscience never stops you from doing anything. It just stops you from enjoying it. On Fri, Jan 8, 2016 at 6:03 PM, 73budden . <budden73@gmail.com> wrote:

Version 3.1.5,

Example system definition:

(defsystem :s3 :components ((cl-user::cons "file-name-does-not-matter") )) ;; eof

I try to load it, it says:

"Error while trying to load definition for system s3 from pathname c:/clcon/lp/test/s3.asd: don't recognize component type CONS"

Then I try to load it another time, it says:

T