You're right that `|` isn't a valid terminal with the normal reader, but, as it happens, the zero-length identifier can be written as `||`. (I don't think the concept of a zero-length identifier is common in other languages: it corresponds to the empty string.)
-Philip On Mon, Feb 3, 2020 at 6:27 PM Kevin Forchione <[email protected]> wrote: > Hi guys, > I’ve been trying to figure out how to use “|” in a macro. I’ve got syntax > like this in mind: > > (foo A | B) > > Not sure if I can do this because the reader expects a pair. If “|” isn’t > a convenient literal to work with is there an alternative others have used > that represents more or less the idea of “or” or “alternate”? > > Thanks! > > Kevin > > -- > You received this message because you are subscribed to the Google Groups > "Racket Users" 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/racket-users/447100AA-DB45-46C3-A7DC-2705A1668302%40gmail.com > . > -- You received this message because you are subscribed to the Google Groups "Racket Users" 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/racket-users/CAH3z3gbfU7x6y_XHmK-uKUeH%3D4exbnvw8wUNzNnipzOMeC7bbQ%40mail.gmail.com.
