Diagnostic points to code with no explanation

[theemathas]

Code

#![allow(unused)]
fn main() {
    let a = 0;
    let mut b = None;
    move || {
        b = Some(&a);
    };
}

Current output

error[E0521]: borrowed data escapes outside of closure
 --> src/main.rs:6:9
  |
4 |     let mut b = None;
  |         ----- `b` declared here, outside of the closure body
5 |     move || {
6 |         b = Some(&a);
  |         ^^^^^^^^^^^^

For more information about this error, try `rustc --explain E0521`.

Desired output

Rationale and extra context

When the compiler points to a piece of code, it usually explains how that code is relevant. Here, however, the compiler just silently points there for some reason.

Other cases

Rust Version

Reproducible on the playground with version 1.93.0-nightly (2025-11-01 bd3ac0330018c23b111b)

Anything else?

No response