{"ast_node_type":"other","tokens":[{"end":23,"kind":"keyword","start":0,"text":"//"}]}
            // usecase.
            // FIXME(RalfJung): could we allow them? Should we? No point in it until we have a
            BorrowKind::Fake(_) | BorrowKind::Mut { kind: MutBorrowKind::ClosureCapture } => {