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error[E0700]: hidden type for `impl Trait<'y>` captures lifetime that does not appear in bounds
--> $DIR/region-escape-via-bound.rs:17:5
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LL | fn foo<'x, 'y>(x: Cell<&'x u32>) -> impl Trait<'y>
| -- -------------- opaque type defined here
| |
| hidden type `Cell<&'x u32>` captures the lifetime `'x` as defined here
...
LL | x
| ^
|
help: to declare that `impl Trait<'y>` captures `'x`, you can add an explicit `'x` lifetime bound
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LL | fn foo<'x, 'y>(x: Cell<&'x u32>) -> impl Trait<'y> + 'x
| ++++
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0700`.
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