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error[E0621]: explicit lifetime required in the type of `y`
--> $DIR/ex2a-push-one-existing-name.rs:6:5
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LL | fn foo<'a>(x: &mut Vec<Ref<'a, i32>>, y: Ref<i32>) {
| -------- help: add explicit lifetime `'a` to the type of `y`: `Ref<'a, i32>`
LL | x.push(y);
| ^^^^^^^^^ lifetime `'a` required
error: aborting due to previous error
For more information about this error, try `rustc --explain E0621`.
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