Software that traps a user with no obvious way to quit is annoying, (especially if one is just starting to learn it).
When Perl 6 is invoked with no options, it starts the REPL, simply offering the ">" prompt, with no explanation of how to get out. Anyone used to software is likely to have no problems guessing "exit", (perhaps after will terminate it, but a newbie might not. How much work would it be to print "To return to the command line, type exit or ^D" when first invoked?
