#[derive(Debug)] struct xx { } 类似报错 error[E0277]: `impl futures::Future<Output = Result<Vec<Value>, anyhow::Error>>` doesn't implement `Debug` 结构体输出Rust 程序设计语言 简体中文版 #[derive(Debug)] struct Rectangle { width: u32, height: u32, } println!("rect1 is {:?}"...
cargo run 报错：syn::Type cannot be formatted using {:?} because it doesn't implement Debug 尝试解决 清除cargo缓存，尝试能否解决：cargo clean 再次运行，还是报错。对于一些新建的rust项目清除缓存能解决一些报错问题，不过这次并没有解决。更换rust版本 更换rust版本，报错依旧，并没有解决。发现问题 查看项...
error[E0277]: `UserModel` doesn't implement `Debug` --> src\main.rs:13:22 | 13 | println!("{:?}", user1); | ^^^ `UserModel` cannot be formatted using `{:?}` | = help: the trait `Debug` is not implemented for `UserModel` = note: add `#[derive(Debug)]` or manually im...
相比自动生成 Debug 实现可以简化代码编写过程,并且可以避免手动实现 Debug 时可能出现的错误。 在本例中,使用宏打印结构体println!("{:?}", s);时,第一行的代码#[derive(Debug)]是必须的,如果去掉就会报错: error[E0277]: `Student` doesn't implement `Debug` --> E:\.rs\struct2.rs:31:22 | 31 ...
IDEA shows error hint: Request<HelloRequest> doesn't implement Debug (required by {:?}). However, the struct tonic::Request and HelloRequest (generated by code) has implemented trait Debug. // ::prost::Message pub trait Message: Debug + Send + Sync {...} And these codes can pass ...
这里的name和grade属于位置参数,每一个 {} 需要匹配一个位置参数,而且这个数据类型是需要实现 std::fmt::Display trait,例如如果name是 Vec<T> 类型的则无法输出: 代码语言:javascript 复制 println!("{}",vec![1,2]);---输出---error[E0277]:`std::vec::Vec<{integer}>`doesn't implement`std::fmt...
首先我们从println!说起,我们之前打印变量值的时候,使用的“{}”格式,其实调用的是对象对Display trait的实现;而"{:?}"是在调用Debug trait的实现。 比如我们如果这么写: println!("c1={}",c1); 直接导致编译失败: `Complex`doesn't implement`Display`(required by{}) ...
$ cargo run Compiling traits-example v0.1.0(file:///projects/traits-example)error[E0277]: `Point` doesn't implement `std::fmt::Display` --> src/main.rs:20:6 |3 | trait OutlinePrint: fmt::Display { | --- required by this bound in `OutlinePrint`...20 | impl OutlinePrint for...
The work has started: https://github.com/intellij-rust/intellij-rust/tree/fc2cfb8e0fc76984495a34ae6a83cbb37188c699/debugger State of the art The debugger is officially available in CLion since 2018.1. Note, CLion doesn't support debuggin...
error[E0277]: `Info` doesn't implement `std::fmt::Display` Of course, implementing theDisplaytrait is one of the options, and RustRover is happy to scaffold an implementation. But in this case, I’d prefer to apply the first suggestion, which involves two simultaneous steps: ...