Expression macro cannot be used as enum discriminant

[dtolnay]

#[macro_use]
extern crate demo_hack;

pub enum E {
    A = add_one!(1)
}

rust-lang/rust#40350

[Mark-Simulacrum]

This has been fixed in Rust master, just so you know; I don't know if any changes here need to be made.

[dtolnay]

Thank you! I will close the issue when I confirm it is fixed in a nightly.