Parser behavior for extra commas on methods declaration is not consistent.

[sebcrozet]

With this code, there is no error:

struct Toto;

impl Toto {
    fn doit(&self, ) // No parse error here!
    { }
}

fn main() {
}

But with this code there is an error:

struct Toto;

impl Toto {
    fn doit(_: &uint, ) // error: unexpected token: `)`
    { }
}

fn main() {
}

I don't know if this extra comma should be an error or not (in my opinion this should be an error). But the behavior should be the same in both cases anyway.

[huonw]

Very similar to #6506, although that issue doesn't cover the (&self, ) case.

[metajack]

Triage bump; still a problem.

[ftxqxd]

Fixed by #16646.

[alexcrichton]

Thanks @P1start!