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error: lifetime may not live long enough
--> $DIR/unique-borrows-are-invariant-1.rs:6:31
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LL | fn extend_lifetime<'a, 'b>(x: &mut (&'a str,), y: &'b str) {
| -- -- lifetime `'b` defined here
| |
| lifetime `'a` defined here
LL | let mut closure = |input| x.0 = input;
| ^^^^^^^^^^^ assignment requires that `'b` must outlive `'a`
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= help: consider adding the following bound: `'b: 'a`
error: aborting due to 1 previous error
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