[bradfitz]

Just sending "true" as a signal is a convention, but some people prefer something like http://play.golang.org/p/oXapo7R4RX

[frou_dh]

Cool, I like that. In some ways, it would be nice if there were a friendly alias for struct{} as part of the language, but I suppose it's hard to come up with a good general name for that.

[lmm]

Many languages call it unit or ().

[frou_dh]

Hah, I was just about to edit my comment to mention unit after doing some reading :)

[exch]

I'll add that the reason for using `struct{}` over `bool`, is that an empty struct occupies 0 bytes, whereas a boolean occupies 1.