{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"//"}]}
    // to join two spans that come from the same file. rust-analyzer's proc-macro server
    // The other problem is proc-macros. Proc-macros have a `Span::join` api that allows them
    // can only join two spans if they belong to the same anchor though, as the spans are relative