This is probably going to be a forehead-slapper, but I can't find a reference in either perlintro.com or http://docs.perl6.org/ (5to6-perlfunc or top-down) for the equivalents of $? and $! in P6.What are they?
I want to be able to "run" or "shell" programs, then examine return codes and errors. (The immediate case is to see if a program name is already in use by running "which $progname". )
