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error: lifetime may not live long enough
--> $DIR/where_clauses_in_structs.rs:11:11
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LL | fn bar<'a, 'b>(x: Cell<&'a u32>, y: Cell<&'b u32>) {
| -- -- lifetime `'b` defined here
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| lifetime `'a` defined here
LL | Foo { x, y };
| ^ this usage requires that `'a` must outlive `'b`
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= help: consider adding the following bound: `'a: 'b`
= note: requirement occurs because of the type `Cell<&u32>`, which makes the generic argument `&u32` invariant
= note: the struct `Cell<T>` is invariant over the parameter `T`
= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
error: aborting due to 1 previous error
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