| A lifetime bound was not satisfied. |
| |
| Erroneous code example: |
| |
| ```compile_fail,E0478 |
| // Check that the explicit lifetime bound (`'SnowWhite`, in this example) must |
| // outlive all the superbounds from the trait (`'kiss`, in this example). |
| |
| trait Wedding<'t>: 't { } |
| |
| struct Prince<'kiss, 'SnowWhite> { |
| child: Box<Wedding<'kiss> + 'SnowWhite>, |
| // error: lifetime bound not satisfied |
| } |
| ``` |
| |
| In this example, the `'SnowWhite` lifetime is supposed to outlive the `'kiss` |
| lifetime but the declaration of the `Prince` struct doesn't enforce it. To fix |
| this issue, you need to specify it: |
| |
| ``` |
| trait Wedding<'t>: 't { } |
| |
| struct Prince<'kiss, 'SnowWhite: 'kiss> { // You say here that 'SnowWhite |
| // must live longer than 'kiss. |
| child: Box<Wedding<'kiss> + 'SnowWhite>, // And now it's all good! |
| } |
| ``` |
