{"ast_node_type":"other","tokens":[{"end":88,"kind":"keyword","start":0,"text":"hir::Node::Item(hir::Item"}]}
        hir::Node::Item(hir::Item { kind: hir::ItemKind::Fn { generics, .. }, .. }) => {
    let (generics, span) = match tcx.hir_node_by_def_id(def_id) {
            (tcx.generics_of(def_id), generics.span)