rust/tests/ui/regions/region-lifetime-bounds-on-fns-where-clause.stderr
Oli Scherer 96d24f2dd1 Revert "Auto merge of #122140 - oli-obk:track_errors13, r=davidtwco"
This reverts commit 65cd843ae0, reversing
changes made to d255c6a57c.
2024-03-11 21:28:16 +00:00

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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`.