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Rigidly project missing item due to guaranteed impossible sized predicate

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This commit is contained in:
Michael Goulet 2025-03-26 18:57:13 +00:00
parent 48f89e7659
commit 27836e1e57
8 changed files with 281 additions and 52 deletions
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37
compiler/rustc_middle/src/ty/sty.rs
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@ -2029,6 +2029,43 @@ impl<'tcx> Ty<'tcx> {
pub fn is_known_rigid(self) -> bool {
self.kind().is_known_rigid()
}
/// Returns true if the type is guaranteed to be one of the three built-in unsized types:
/// `dyn Trait`/`[T]`/`str`. This function is *raw* because it does not compute the struct
/// tail of the type, so you are responsible for doing that yourself.
// NOTE: Keep this in sync with `rustc_type_ir`'s copy.
pub fn is_guaranteed_unsized_raw(self) -> bool {
match self.kind() {
Dynamic(_, _, ty::Dyn) | ty::Slice(_) | ty::Str => true,
Bool
| Char
| Int(_)
| Uint(_)
| Float(_)
| Adt(_, _)
| Foreign(_)
| Array(_, _)
| Pat(_, _)
| RawPtr(_, _)
| Ref(_, _, _)
| FnDef(_, _)
| FnPtr(_, _)
| UnsafeBinder(_)
| Closure(_, _)
| CoroutineClosure(_, _)
| Coroutine(_, _)
| CoroutineWitness(_, _)
| Never
| Tuple(_)
| Alias(_, _)
| Param(_)
| Bound(_, _)
| Placeholder(_)
| Infer(_)
| Error(_)
| Dynamic(_, _, ty::DynStar) => false,
}
}
}
impl<'tcx> rustc_type_ir::inherent::Tys<TyCtxt<'tcx>> for &'tcx ty::List<Ty<'tcx>> {