| ^^^--------------
| | |
| | `*cb` moved due to this method call
+ | help: consider calling `.as_ref()` or `.as_mut()` to borrow the type's contents
| move occurs because `*cb` has type `Option<&mut dyn FnMut()>`, which does not implement the `Copy` trait
|
note: this function takes ownership of the receiver `self`, which moves `*cb`
|
LL | pub const fn map<U, F>(self, f: F) -> Option<U>
| ^^^^
-help: consider calling `.as_ref()` to borrow the type's contents
- |
-LL | cb.as_ref().map(|cb| cb());
- | +++++++++
error[E0596]: cannot borrow `*cb` as mutable, as it is behind a `&` reference
--> $DIR/suggest-as-ref-on-mut-closure.rs:12:26