{"ast_node_type":"enum","tokens":[{"end":85,"kind":"keyword","start":0,"text":".map(|span|"}]}
        .map(|span| span_error(span, "enum variant cannot have fields (TryFromU32)"))
        .filter_map(|v| v.ast().fields.iter().map(|f| f.span()).next())
        .collect::<TokenStream>();