Stubs == seams, IMO. Self calls are certainly not a problem, as you pointed out, but in that case recur is a pretty elegant way of supporting that while not mak

Stubs == seams, IMO. Self calls are certainly not a problem, as you pointed out, but in that case recur is a pretty elegant way of supporting that while not making Clojure appear to support something it doesn't. EDIT: Also what you suggest would imply huge changes to the way code is evaluated in Clojure - for example, I can create functions in the REPL and they work the same way as reading functions out of a file. How would that work in your scenario? I think every function would actually have to have a stub not just the mutually recursive ones because you might not know until later which functions to combine.