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Fix sized constraint for unsafe binder

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This commit is contained in:
Michael Goulet 2025-02-28 03:17:02 +00:00
parent f45d4acf1b
commit b67b6c0503
3 changed files with 35 additions and 3 deletions
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9
compiler/rustc_ty_utils/src/ty.rs
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@ -37,8 +37,6 @@ fn sized_constraint_for_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'
| Never
| Dynamic(_, _, ty::DynStar) => None,
UnsafeBinder(_) => todo!(),
// these are never sized
Str | Slice(..) | Dynamic(_, _, ty::Dyn) | Foreign(..) => Some(ty),
@ -52,9 +50,14 @@ fn sized_constraint_for_ty<'tcx>(tcx: TyCtxt<'tcx>, ty: Ty<'tcx>) -> Option<Ty<'
sized_constraint_for_ty(tcx, ty)
}),
// these can be sized or unsized
// these can be sized or unsized.
Param(..) | Alias(..) | Error(_) => Some(ty),
// We cannot instantiate the binder, so just return the *original* type back,
// but only if the inner type has a sized constraint. Thus we skip the binder,
// but don't actually use the result from `sized_constraint_for_ty`.
UnsafeBinder(inner_ty) => sized_constraint_for_ty(tcx, inner_ty.skip_binder()).map(|_| ty),
Placeholder(..) | Bound(..) | Infer(..) => {
bug!("unexpected type `{ty:?}` in sized_constraint_for_ty")
}