How to use the vis specifier inside the lazy_static! macro?

[magiclen]

When compiling the code below

#[macro_use]
extern crate lazy_static;

macro_rules! unit_like_struct {
    ( $v:vis $name:ident) => {
        $v struct $name;
    }
}

unit_like_struct!(pub MyStruct);

macro_rules! lazy_string {
    ( $v:vis $name:ident, $s:expr) => {
        lazy_static! {
            $v static ref $name: String = format!($s);
        }
    }
}

lazy_string!(pub NOTHING, "nothing");

Cargo says,

error: no rules expected the token `pub `
  --> src/main.rs:15:13
   |
15 |             $v static ref $name: String = format!($s);
   |             ^^ no rules expected this token in macro call
...
20 | lazy_string!(pub NOTHING, "nothing");
   | ------------------------------------- in this macro invocation

Thanks in advance!

[KodrAus]

Hi @magiclen 👋

Unfortunately the lazy_static macro predates proper macro support for pub(restricted) (which appears to have stabilized in 1.30.0) so it rolls its own. This doesn't appear to be compatible with the proper vis matcher. That's a bit nasty though, so we should look at shifting to vis at some point.