{"ast_node_type":"variable","tokens":[{"end":73,"kind":"keyword","start":0,"text":"if"}]}
        if let Some(span) = params.iter().find_map(|arg| match arg.name {
    if let Some(generics) = generics {
            hir::ParamName::Plain(Ident { name: kw::Underscore, span }) => Some(span),