Turn label into structured suggestion for `.as_ref()` and `.as_mut()`
```
error[E0382]: use of moved value: `foo`
--> $DIR/as-ref-2.rs:10:14
|
LL | let foo = Some(Struct);
| --- move occurs because `foo` has type `Option<Struct>`, which does not implement the `Copy` trait
LL | let _x: Option<Struct> = foo.map(|s| bar(&s));
| ---------------- `foo` moved due to this method call
LL | let _y = foo;
| ^^^ value used here after move
|
note: `Option::<T>::map` takes ownership of the receiver `self`, which moves `foo`
--> $SRC_DIR/core/src/option.rs:LL:COL
help: consider calling `.as_ref()` to borrow the value's contents
|
LL | let _x: Option<Struct> = foo.as_ref().map(|s| bar(&s));
| +++++++++
help: consider calling `.as_mut()` to mutably borrow the value's contents
|
LL | let _x: Option<Struct> = foo.as_mut().map(|s| bar(&s));
| +++++++++
```
Matthias Krüger
6da1cc247c