_All_ routines in Perl 6 return _something._ A lack of a "-->" simply indicates stylistically that the return is not useful because it's whatever "falls off the end". (There's a bit of variance here as I'm not sure it's a convention everyone has followed.) It's equivalent to "--> Mu" because anything that could "fall of the end" is Mu.
On Wed, Oct 3, 2018 at 21:07 ToddAndMargo <toddandma...@zoho.com> wrote: > Hi All, > > In another thread, Timo wrote me: > > The "-->" part of the signature is optional. If there isn't > one, it defaults to Mu, which is the type that everything > conforms to, i.e. the sub or method that either has "--> Mu" > explicitly, or has it by leaving it out, may return > absolutely whatever it wants. > > After all, the "-->" part is a constraint, and it gets > validated at compile time every time a sub or method > returns. > > I got to thinking, some routines do not return anything. Without > the "-->" constraint, how am I to determine if something is > being returned? > > Yours in confusion, > -T >
