Questions tagged [rust-2021]

Say a Rust 2018 macro defines an async function inside it. The syntax it would use would be incompatible with Rust 2015. So if you're compiling your crate with 2015 edition, wouldn't this expanded code from the macro conflict with that? I'm not that…

I have the following code in src/ main.rs a.rs b.rs Here's the code: main.rs mod a; mod b; use crate::a::Summary; use crate::b::Person; fn main() { let p = Person{ first: "John".to_string(), last:…

I have some code that needs to create and use a quick_xml::Writer with either a File or Cursor depending on user input. What is the proper Rust way (non-inheritance/no downcasting) to create a Writer with different structs but same trait? All the…

I'm learning rust for fun after C++ class and I'm wondering, can use std::io break my code after update of rustc edition to newer? For example, in C++ using using namespace std is bad, because if new function gets added to std your multiple…