"error[E0507]: cannot move out of borrowed content" could suggest adding the Copy trait

[learnopengles]

For this error:

error[E0507]: cannot move out of borrowed content
--> file.rs:302:35
|
302 | let c = b.map(|entry| entry.symbol_kind);
| ^^^^^ cannot move out of borrowed content

error: aborting due to previous error

The compiler could suggest adding #[derive(Copy, Clone)] to the relevant enum. The error message on its own does not offer enough insight on how to fix the problem, from a non-proficient user's POV.

[BGR360]

Looks like your wish has been granted since you posted the issue!

Playground

struct NotCopy;

struct ContainsNotCopy {
    inner: NotCopy
}

fn main() {
    let container = ContainsNotCopy { inner: NotCopy };
    
    let option = Some(&container);
    
    let _ = option.map(|c| c.inner);
}

error[E0507]: cannot move out of `c.inner` which is behind a shared reference
  --> src/main.rs:12:28
   |
12 |     let _ = option.map(|c| c.inner);
   |                            ^^^^^^^ move occurs because `c.inner` has type `NotCopy`, which does not implement the `Copy` trait

Can we close this?