{"ast_node_type":"other","tokens":[{"end":48,"kind":"keyword","start":0,"text":"//"}]}
            // also forbidding two phase borrows
            // FIXME: consider changing this to only promote &mut [] for default borrows,
            BorrowKind::Mut { kind: MutBorrowKind::Default | MutBorrowKind::TwoPhaseBorrow } => {