Rustfmt breaks static async closure

[dtolnay]

#![feature(async_closure)]

macro_rules! expr {
    ($e:expr) => {};
}

expr!(static async || {});

As of current master (7b8303d), cargo run --bin rustfmt -- repro.rs --emit=stdout --edition=2021 creates the following diff:

- expr!(static async || {});
+ expr!(async static || {});

which fails to compile:

error: expected one of `move`, `|`, or `||`, found keyword `static`
 --> repro.rs:7:13
  |
4 |     ($e:expr) => {};
  |      ------- while parsing argument for this `expr` macro fragment
...
7 | expr!(async static || {});
  |             ^^^^^^ expected one of `move`, `|`, or `||`