My main reason for using _proper_ dynamic languages (or better - dynamic languages VM - Lisps, APLs, etc.) is REPL/interactive debugger (stack restarts, walking

My main reason for using _proper_ dynamic languages (or better - dynamic languages VM - Lisps, APLs, etc.) is REPL/interactive debugger (stack restarts, walking the stack freely, changing/fixing functions while debugging). The overall idea is keeping state across changes. That's of utmost importance for doing complex things. And vice versa: Restarting/recompiling to fix a small error while calculating something heavy? No, thanks. BTW, Rust guys promised REPL by the end of 2018 :)