This patch removes a function that was called emits (note the "s"). It simply called emit inside a with-out-string.
The emitx function in this patch isn't that simple. It does some special handling of nil, maps, seqs, functions, etc. It creates a mini DSL for emitting code, so that I didn't have to drastically rewrite all the places that used (print (emit-str ...)) and similar before.
I decided not to call it emit-str to avoid confusion with the old emits function, as well as to differentiate the behavior from prn-str and the others, which return a string without affecting the previously set out. Quite honestly, the best name for it is simply "emit", but that honor goes to the current multi-method, which is probably best named "emit-ast". I don't think it's worth the churn to rename that.
Either way, I'm not too picky. If you have a preferred name, I'll update the patch to whatever you like.