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説明
As introduced in rust 1.37: https://blog.rust-lang.org/2019/08/15/Rust-1.37.0.html#using-unnamed-const-items-for-macros
Iota currently rejects code containing underscore names.
iota! {
const A: u8 = 1 << iota;
| _
| C
}
error: no rules expected the token `|`
--> src/main.rs:5:9
|
5 | | _
| ^ no rules expected this token in macro call