| error[E0596]: cannot borrow `y` as mutable, as it is not declared as mutable |
| --> $DIR/ex3-both-anon-regions-using-trait-objects.rs:2:3 |
| | |
| LL | y.push(z); |
| | ^ cannot borrow as mutable |
| | |
| help: consider changing this to be mutable |
| | |
| LL | fn foo(x:Box<dyn Fn(&u8, &u8)> , mut y: Vec<&u8>, z: &u8) { |
| | +++ |
| |
| error: lifetime may not live long enough |
| --> $DIR/ex3-both-anon-regions-using-trait-objects.rs:2:3 |
| | |
| LL | fn foo(x:Box<dyn Fn(&u8, &u8)> , y: Vec<&u8>, z: &u8) { |
| | - - let's call the lifetime of this reference `'1` |
| | | |
| | let's call the lifetime of this reference `'2` |
| LL | y.push(z); |
| | ^^^^^^^^^ argument requires that `'1` must outlive `'2` |
| | |
| = note: requirement occurs because of a mutable reference to `Vec<&u8>` |
| = note: mutable references are invariant over their type parameter |
| = help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance |
| help: consider introducing a named lifetime parameter |
| | |
| LL | fn foo<'a>(x:Box<dyn Fn(&u8, &u8)> , y: Vec<&'a u8>, z: &'a u8) { |
| | ++++ ++ ++ |
| |
| error: aborting due to 2 previous errors |
| |
| For more information about this error, try `rustc --explain E0596`. |
