diff options
Diffstat (limited to 'src/test/ui/regions/regions-trait-object-subtyping.stderr')
| -rw-r--r-- | src/test/ui/regions/regions-trait-object-subtyping.stderr | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/src/test/ui/regions/regions-trait-object-subtyping.stderr b/src/test/ui/regions/regions-trait-object-subtyping.stderr new file mode 100644 index 000000000..1b3a116d5 --- /dev/null +++ b/src/test/ui/regions/regions-trait-object-subtyping.stderr @@ -0,0 +1,34 @@ +error: lifetime may not live long enough + --> $DIR/regions-trait-object-subtyping.rs:15:5 + | +LL | fn foo3<'a,'b>(x: &'a mut dyn Dummy) -> &'b mut dyn Dummy { + | -- -- lifetime `'b` defined here + | | + | lifetime `'a` defined here +LL | // Without knowing 'a:'b, we can't coerce +LL | x + | ^ function was supposed to return data with lifetime `'b` but it is returning data with lifetime `'a` + | + = help: consider adding the following bound: `'a: 'b` + = note: requirement occurs because of a mutable reference to `dyn Dummy` + = 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: lifetime may not live long enough + --> $DIR/regions-trait-object-subtyping.rs:22:5 + | +LL | fn foo4<'a:'b,'b>(x: Wrapper<&'a mut dyn Dummy>) -> Wrapper<&'b mut dyn Dummy> { + | -- -- lifetime `'b` defined here + | | + | lifetime `'a` defined here +LL | // We can't coerce because it is packed in `Wrapper` +LL | x + | ^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b` + | + = help: consider adding the following bound: `'b: 'a` + = note: requirement occurs because of a mutable reference to `dyn Dummy` + = 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 2 previous errors + |