Impossible to have a macro expand to `pub` method

[mitsuhiko]

Currently a macro cannot create a pub fn. It can however create a regular fn.

#![feature(macro_rules)]

macro_rules! foo (
    () => (
        pub fn foo() -> int {
            42
        }
    )
)

struct X;

impl X {
    foo!()
}

fn main() {
    println!("{}", X::foo());
}

Fails with:

$ rustc test.rs
test.rs:5:9: 5:12 error: unexpected token: `pub`
test.rs:5         pub fn foo() -> int {
                  ^~~

[huonw]

This is a problem with pub methods specifically, it works fine if foo! is used to define a normal top-level function (i.e. not inside an impl).

[shepmaster]

Dupe of #17436 ?

[huonw]

@shepmaster, thanks.