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Add a comment explaining some weird is_vtable_safe_method behavior

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Maybe Waffle 2023-07-30 12:14:08 +00:00 committed by Maybe Waffle
parent 94c9d0c90f
commit 6cb3376434
1 changed files with 4 additions and 0 deletions
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4
compiler/rustc_trait_selection/src/traits/object_safety.rs
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@ -97,6 +97,10 @@ fn check_is_object_safe(tcx: TyCtxt<'_>, trait_def_id: DefId) -> bool {
/// object. Note that object-safe traits can have some
/// non-vtable-safe methods, so long as they require `Self: Sized` or
/// otherwise ensure that they cannot be used when `Self = Trait`.
///
/// [`MethodViolationCode::WhereClauseReferencesSelf`] is considered object safe due to backwards
/// compatibility, see <https://github.com/rust-lang/rust/issues/51443> and
/// [`WHERE_CLAUSES_OBJECT_SAFETY`].
pub fn is_vtable_safe_method(tcx: TyCtxt<'_>, trait_def_id: DefId, method: ty::AssocItem) -> bool {
debug_assert!(tcx.generics_of(trait_def_id).has_self);
debug!("is_vtable_safe_method({:?}, {:?})", trait_def_id, method);