{"ast_node_type":"other","tokens":[{"end":100,"kind":"keyword","start":0,"text":"Mutability::Mut"}]}
            Mutability::Mut => CaptureKind::ByRef(BorrowKind::Mut { kind: MutBorrowKind::Default }),
        let capture_kind = match m {
            Mutability::Not => CaptureKind::ByRef(BorrowKind::Shared),