Similarly, some Lisps (like Scheme48 IIRC) use a comma to begin REPL commands (as distinct from Lisp forms) because commas outside of quasiquotation forms are o

Similarly, some Lisps (like Scheme48 IIRC) use a comma to begin REPL commands (as distinct from Lisp forms) because commas outside of quasiquotation forms are otherwise syntax errors.