{"ast_node_type":"other","tokens":[{"end":72,"kind":"keyword","start":0,"text":"///"}]}
    /// this contains all kinds of macro, not just `macro_rules!` macro.
    /// `macro_use` prelude that contains macros from `#[macro_use]`'d external crates. Note that
    /// ExternCrateId being None implies it being imported from the general prelude import.