bjoernager/rust
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Point at explicit 'static obligations on a trait

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Given `trait Any: 'static` and a `struct` with a `Box<dyn Any + 'a>` field, point at the `'static` bound in `Any` to explain why `'a: 'static`.

```
error[E0478]: lifetime bound not satisfied
   --> f202.rs:2:12
    |
2   |     value: Box<dyn std::any::Any + 'a>,
    |            ^^^^^^^^^^^^^^^^^^^^^^^^^^^
    |
note: lifetime parameter instantiated with the lifetime `'a` as defined here
   --> f202.rs:1:14
    |
1   | struct Hello<'a> {
    |              ^^
note: but lifetime parameter must outlive the static lifetime
   --> /home/gh-estebank/rust/library/core/src/any.rs:113:16
    |
113 | pub trait Any: 'static {
    |                ^^^^^^^
```

Partially address #33652.
This commit is contained in:
Esteban Küber 2024-08-12 22:57:14 +00:00
parent 4d5b3b1962
commit f5bae722be
8 changed files with 80 additions and 11 deletions
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2
compiler/rustc_hir_analysis/src/check/wfcheck.rs
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@ -747,7 +747,7 @@ fn region_known_to_outlive<'tcx>(
region_b: ty::Region<'tcx>,
) -> bool {
test_region_obligations(tcx, id, param_env, wf_tys, |infcx| {
infcx.sub_regions(infer::RelateRegionParamBound(DUMMY_SP), region_b, region_a);
infcx.sub_regions(infer::RelateRegionParamBound(DUMMY_SP, None), region_b, region_a);
})
}