> with its built-in REPL facility

brotha... please.. you're making me laugh so hard, my parentheses are shaking and getting unbalanced. Non-lispy langs that "provide REPL facilities" and Lisp dialects share the word "REPL" the way a rowboat and an aircraft carrier share the word "vessel". A Lisp REPL is an architectural relationship between you and a running system. Dlang's REPL is a nice sketchpad - worse than Python's. It's in the same "sketchpad league" with C#'s, Ruby's, Kotlin's and Node's. Clojure REPL is closer to what Smalltalk had - you're always inside the machine.