{"ast_node_type":"other","tokens":[{"end":86,"kind":"keyword","start":0,"text":"hir::ParamName::Plain(Ident"}]}
            hir::ParamName::Plain(Ident { name: kw::Underscore, span }) => Some(span),
        if let Some(span) = params.iter().find_map(|arg| match arg.name {
            _ => None,