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error: lifetime may not live long enough
--> $DIR/subset-relations.rs:10:5
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LL | fn missing_subset<'a, 'b>(x: &'a u32, y: &'b u32) -> &'a u32 {
| -- -- lifetime `'b` defined here
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| lifetime `'a` defined here
LL | y
| ^ function was supposed to return data with lifetime `'a` but it is returning data with lifetime `'b`
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= help: consider adding the following bound: `'b: 'a`
error: aborting due to previous error
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