error: the `?` macro repetition operator does not take a separator

[guilliamxavier]

The "Macros & Attributes" section contains these three rows:

$(x),*	Macro repetition REF zero or more times.
$(x),?	Same, but zero or one time.
$(x),+	Same, but one or more times.

but the linked reference adds:

Since ? represents at most one occurrence, it cannot be used with a separator.

and indeed, trying to compile the following:

macro_rules! m {
    ($(x),*) => { $(x),* };
    ($(x),?) => { $(x),? };
    ($(x),+) => { $(x),+ };
}

gives an error (title of this issue) on the second rule (twice: for the matcher and for the transcriber).

PS: Thanks for the work!

[ralfbiedert]

Hah, thanks!