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Diffstat (limited to 'src/test/ui/match/match-ref-mut-invariance.stderr')
| -rw-r--r-- | src/test/ui/match/match-ref-mut-invariance.stderr | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/src/test/ui/match/match-ref-mut-invariance.stderr b/src/test/ui/match/match-ref-mut-invariance.stderr new file mode 100644 index 000000000..3b7e53cd5 --- /dev/null +++ b/src/test/ui/match/match-ref-mut-invariance.stderr @@ -0,0 +1,17 @@ +error: lifetime may not live long enough + --> $DIR/match-ref-mut-invariance.rs:10:9 + | +LL | impl<'b> S<'b> { + | -- lifetime `'b` defined here +LL | fn bar<'a>(&'a mut self) -> &'a mut &'a i32 { + | -- lifetime `'a` defined here +LL | match self.0 { ref mut x => x } + | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated 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 `&i32` + = 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 previous error + |