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Check lazy type aliases for well-formedness

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León Orell Valerian Liehr 2023-07-30 01:46:20 +02:00
parent 2e0136a131
commit 0ca432844c
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8 changed files with 55 additions and 11 deletions
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7
compiler/rustc_hir_analysis/src/check/wfcheck.rs
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@ -246,8 +246,11 @@ fn check_item<'tcx>(tcx: TyCtxt<'tcx>, item: &'tcx hir::Item<'tcx>) {
// `ForeignItem`s are handled separately.
hir::ItemKind::ForeignMod { .. } => {}
hir::ItemKind::TyAlias(hir_ty, ..) => {
if tcx.type_of(item.owner_id.def_id).skip_binder().has_opaque_types() {
// Bounds are respected for `type X = impl Trait` and `type X = (impl Trait, Y);`
if tcx.features().lazy_type_alias
|| tcx.type_of(item.owner_id).skip_binder().has_opaque_types()
{
// Bounds of lazy type aliases and of eager ones that contain opaque types are respected.
// E.g: `type X = impl Trait;`, `type X = (impl Trait, Y);`.
check_item_type(tcx, def_id, hir_ty.span, UnsizedHandling::Allow);
}
}