{"ast_node_type":"other","tokens":[{"end":35,"kind":"keyword","start":0,"text":"eager_callback:"}]}
    eager_callback: &mut dyn FnMut(
    resolver: impl Fn(&ModPath) -> Option<MacroDefId> + Copy,
        InFile<(syntax::AstPtr<ast::MacroCall>, span::FileAstId<ast::MacroCall>)>,