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error: lifetime may not live long enough
--> $DIR/regions-bounded-method-type-parameters-cross-crate.rs:20:5
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LL | fn call_bigger_region<'x, 'y>(a: Inv<'x>, b: Inv<'y>) {
| -- -- lifetime `'y` defined here
| |
| lifetime `'x` defined here
LL | // Here the value provided for 'y is 'y, and hence 'y:'x does not hold.
LL | a.bigger_region(b)
| ^^^^^^^^^^^^^^^^^^ argument requires that `'y` must outlive `'x`
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= help: consider adding the following bound: `'y: 'x`
= note: requirement occurs because of the type `Inv<'_>`, which makes the generic argument `'_` invariant
= note: the struct `Inv<'a>` is invariant over the parameter `'a`
= help: see <https://doc.rust-lang.org/nomicon/subtyping.html> for more information about variance
error: aborting due to previous error
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