> Testing, indeed it is not valid there. :-) > > I wonder if it would be worth supporting such a case, I could report it in > any case, done. :-) >
My point is that changing the AST is a slippery slope. I will likely always find an example that fails because of precedence and mangling. Hmm, soft-matching operator, makes sense. Any chance on updating the docs > at http://elixir-lang.org/docs/stable/elixir/Kernel. > SpecialForms.html#for/1 where it states "Enumerable generators are > defined using <-:" to something of that form, maybe like "`<-` matches on > each given element and skips non-matches", although that still does not > match how `with` does it. Hmm, it seems that `for` and `with` are using an > identical operator in incompatible ways. > Improving the docs is a great idea. And again, the skipping or not is defined by the enclosing with or for. All <- does is to check if something matches. All you need to know is that the left side is a pattern. > Hmm, having `when` be directly adjacent to `=` in precedence, what side > effects would that have? I do not think that `=` is allowed adjacent to a > `when` that I can think of in function heads (which are the only other case > where `when` is used that comes to immediate mind) so no issue there. > As mentioned in the previous email, it is related to the precedence of = and when on the left side of ->. Play with the grammar and let us know if you can make both "x when y = z" and "x = y when z -> w" work. Maybe if both operators have the same precedence and are left associative? -- *José Valim* www.plataformatec.com.br Skype: jv.ptec Founder and Director of R&D -- You received this message because you are subscribed to the Google Groups "elixir-lang-core" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4L%2B-TuJLsbC22qjduDzw-WsghUZJqHw%3D3Z_J80wr5-Xpg%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
