Function rustc_ty_utils::structural_match::has_structural_eq_impls

fn has_structural_eq_impls<'tcx>(tcx: TyCtxt<'tcx>, adt_ty: Ty<'tcx>) -> bool

This method returns true if and only if adt_ty itself has been marked as eligible for structural-match: namely, if it implements both StructuralPartialEq and StructuralEq (which are respectively injected by #[derive(PartialEq)] and #[derive(Eq)]).

Note that this does not recursively check if the substructure of adt_ty implements the traits.