| error: lifetime may not live long enough |
| --> $DIR/ex2e-push-inference-variable-3.rs:6:33 |
| | |
| LL | fn foo<'a, 'b, 'c>(x: &'a mut Vec<Ref<'b, i32>>, y: Ref<'c, i32>) { |
| | -- -- lifetime `'c` defined here |
| | | |
| | lifetime `'b` defined here |
| LL | let a: &mut Vec<Ref<i32>> = x; |
| | ^ assignment requires that `'c` must outlive `'b` |
| | |
| = help: consider adding the following bound: `'c: 'b` |
| = note: requirement occurs because of a mutable reference to `Vec<Ref<'_, 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 1 previous error |
| |
