REPL ergonomics

[Martin (Martin R)]

@Austin

If we moved the "Type :help for assistance." sentence to its own line, it might be easier for people to notice. Maybe change it to "Type :help for assistance; ctrl+D to quit". That might be an easy, useful first step.

I like that, but would change it to

Type :help for assistance; :quit to quit

There is also Swift on Windows, where EOF is signaled by "F6" instead of "Ctrl-D".