mirror of
https://github.com/rust-lang/rust.git
synced 2024-10-30 14:01:51 +00:00
44 lines
1.7 KiB
Plaintext
44 lines
1.7 KiB
Plaintext
error[E0308]: mismatched types
|
|
--> $DIR/region-lifetime-bounds-on-fns-where-clause.rs:20:43
|
|
|
|
|
LL | let _: fn(&mut &isize, &mut &isize) = a;
|
|
| ---------------------------- ^ one type is more general than the other
|
|
| |
|
|
| expected due to this
|
|
|
|
|
= note: expected fn pointer `for<'a, 'b, 'c, 'd> fn(&'a mut &'b _, &'c mut &'d _)`
|
|
found fn item `for<'a, 'b> fn(&'a mut &_, &'b mut &_) {a::<'_, '_>}`
|
|
|
|
error: lifetime may not live long enough
|
|
--> $DIR/region-lifetime-bounds-on-fns-where-clause.rs:8:5
|
|
|
|
|
LL | fn b<'a, 'b>(x: &mut &'a isize, y: &mut &'b isize) {
|
|
| -- -- lifetime `'b` defined here
|
|
| |
|
|
| lifetime `'a` defined here
|
|
LL | // Illegal now because there is no `'b:'a` declaration.
|
|
LL | *x = *y;
|
|
| ^^^^^^^ assignment requires that `'b` must outlive `'a`
|
|
|
|
|
= help: consider adding the following bound: `'b: 'a`
|
|
|
|
error: lifetime may not live long enough
|
|
--> $DIR/region-lifetime-bounds-on-fns-where-clause.rs:14:5
|
|
|
|
|
LL | fn c<'a,'b>(x: &mut &'a isize, y: &mut &'b isize) {
|
|
| -- -- lifetime `'b` defined here
|
|
| |
|
|
| lifetime `'a` defined here
|
|
...
|
|
LL | a(x, y);
|
|
| ^^^^^^^ argument requires that `'b` must outlive `'a`
|
|
|
|
|
= help: consider adding the following bound: `'b: 'a`
|
|
= note: requirement occurs because of a mutable reference to `&isize`
|
|
= note: mutable references are invariant over their type parameter
|
|
= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
|
|
|
|
error: aborting due to 3 previous errors
|
|
|
|
For more information about this error, try `rustc --explain E0308`.
|