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Communicate to the user precisely what failed to match. Conversation here: http://groups.google.com/group/clojure/browse_thread/thread/675456fba1712214. We adopt the behavior of condp since that is closer to what match does and will do (predicate dispatch)
Comment made by: dnolen
Continuing the conversation from GitHub - concerning your changes, we should probably show what current occurrence failed to match as well as the breadcrumb.
Matching diagnostics will be complicated by MATCH-1. Clojure doesn't yet support simple data conveying exceptions. Will probably have to use a combination of proxy and definterface.
Comment made by: ambrosebs
I haven't yet kept up with your backtracking changes, and I just noticed this conversation, so I'll have to have another look at diagnostics with backtracking.
Lowering priority. Happy to take a patch, but I don't think I'll be looking into this myself in the near future.