Is there a nice (ideally built in or in itertools) way to split a &str on boundaries? For example I want to split where c.is_alphanumeric() or c.is_whitespace() changes.

I’m trying to create custom errors for some function:

Is there any way to define a function in Rust with a generically-typed argument which will either copy or (immutably) borrow the argument depending on whether its concrete type is a Copy type? If that requires a macro, how might one go about writing such a macro–can they be invoked with knowledge of the concrete type being used at compile time?

Is there any way to define a function in Rust with a generically-typed argument which will either copy or (immutably) borrow the argument depending on whether its concrete type is a Copy type? If that requires a macro, how might one go about writing such a macro–can they be invoked with knowledge of the concrete type being used at compile time?

I’d like to create an iterator from a function, which would yield references to a mutable variable.

use actix_web::{get, post, web, App, HttpServer, HttpResponse, Responder}; use serde::{Deserialize, Serialize}; use env_logger::Env; use log::info; #[get(“/”)] async fn hello() -> impl Responder { info!(“Request received”); “Hello, world!” } #[post(“/health”)] async fn echo(req_body: String) -> impl Responder { format!(“You sent: {}”, req_body) } #[derive(Deserialize)] struct Info { name: String, } #[derive(Serialize)] struct Greeting { message: String, […]

I am using actix-web to provide the static pdf file preview, this is the rust code look like:

I was looking at the output from #[derive(Debug)] for a simple case using cargo expand, where this:

I was looking at the output from #[derive(Debug)] for a simple case using cargo expand, where this:

I was looking at the output from #[derive(Debug)] for a simple case using cargo expand, where this: