opt-level removes diagnostic output

use std::arch::global_asm;

macro_rules! wrap {
    () => {
        macro_rules! _a {
            () => {
                ":"
            };
        }
    };
}

wrap!();

use _a as a;

global_asm!(a!());

fn main() {}

rustc a.rs --edition=2021 -Copt-level=0

error: unexpected token at start of statement
  |
note: instantiated into assembly here
 --> <inline asm>:2:1
  |
2 | :
  | ^

error: aborting due to 1 previous error

rustc a.rs --edition=2021 -Copt-level=1

error: <inline asm>:2:1: unexpected token at start of statement
:
^

I would think the diagnostics would be the same regardless of codegen backend optimization level 🤔