Function mk_lint

fn mk_lint(
    tcx: TyCtxt<'_>,
    diag: &mut Diag<'_, ()>,
    type_def_id: DefId,
    impl_def_id: DefId,
    orig_fields: FxHashMap<Symbol, &FieldDef<'_>>,
    fields: &[ExprField<'_>],
)