{"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"if"}]}
        if idx1.equivalent_for_indexing(idx2) {
        let hir::ExprKind::Index(_, idx2, _) = parent.kind else { return };
            // `let a = &mut foo[0]` and `let b = &mut foo[0]`? Don't mention `split_at_mut`