Earlier quoted context omitted.
Clojure too, by all accounts. I'd say Common Lisp but they're in the weird position of code itself being rampantly portable across time but the ecosystem around it being astonishingly immature.
Things have improved a lot with the introduction of Quicklisp, but I'd have to agree when compared to others. CL is still one of the nicest languages there is, and the only language that skirts the line between being some combination of dynamic and interpreted yet typed and compiled. It is showing its age though, particularly around the edges like what you're saying.
The other problem is rate of updates, and that's a symptom of it basically being on one person's shoulders to keep it ticking over. I can't readily think of another major language ecosystem with that characteristic. It just seems really fragmented.