Documentation for error messages

[email protected] (Parrot Raiser) Mon, 24 Oct 2016 18:56:09 -0400
Newsgroups perl.perl6.language
Message-ID <CACwLAp-14ihV1fYOUD=AJkCCay77vBL03umdATK3gopt_0N22A@mail.gmail.com>
Where's the best current description of error messages from file
"open" commands, and how to control them?

(I'm thinking of things like the effect of adding "\n" to "die" messages in P5.)