{"ast_node_type":"other","tokens":[{"end":66,"kind":"keyword","start":0,"text":"//"}]}
                    //                                      ^^^^^^
                    // fn f(x: u32, y: u32, z: u32, w: u16, q: u16) -> u32,
                    let span = decl.inputs[index].span.to(decl.inputs.last().unwrap().span);