Make "cannot move out of borrowed content" more beginner friendly

[oli-obk]

The following code emits "cannot move out of borrowed content" without any hint about the reason whatsoever. I think we should add a "help" pointing to the self argument of talk and stating something along the lines of "because of consuming argument here". If it's in the same crate, maybe even suggest to change it to a reference.

struct Sheep {
    message: String
}

impl Sheep {
    fn talk(self) {
        println!("{}", self.message);
    }
}

fn main()
{
    let sheep = &Sheep { message: "Määh".into() };
    sheep.talk();
}

(Playground)

Errors:

   Compiling playground v0.0.1 (file:///playground)
error[E0507]: cannot move out of borrowed content
  --> src/main.rs:14:5
   |
14 |     sheep.talk();
   |     ^^^^^ cannot move out of borrowed content

error: aborting due to previous error

For more information about this error, try `rustc --explain E0507`.
error: Could not compile `playground`.

To learn more, run the command again with --verbose.

[csmoe]

as I mentioned in zulip when talked about #53882, the borrowck should have something like borrower/mover(consumer), etc to help the users find out where the behaviors occurs:

struct Sheep {
    message: String
}

impl Sheep {
    fn talk(self) {
       ^^^^^^^^^ ... mover
        println!("{}", self.message);
    }
}

fn main()
{
    let sheep = &Sheep { message: "Määh".into() };
    sheep.talk();
    ^^^^^ ... moved by `Sheep::talk`
}

[jryans]

@rustbot label D-newcomer-roadblock

[ibraheemdev]

Duplicate of #43161