Rust supports trait inheritance, as follows: pub trait A {} pub trait B: A {} B: A means that if some type T implements B, it also needs to implement all the methods in A. But today I see the foll...

If you create a function returning an impl Trait which requires a lifetime that can't be elided, rustc tells you to add it. use futures::prelude::*; fn make_fut(input: &()) -> impl Future&l...

Here's the code: use std::thread; use std::sync::mpsc; fn main() { //spawn threads let (tx, rx) = mpsc::channel(); for mut i in 0 .. 10 { let txc = tx.clone(); //clone from the main sender ...

I'm trying to deserialize MathML using Serde and Quick-XML in Rust. I'm having trouble trying to write the structs because of the recursive nature of MathML. Here's a minimal, reproducible example:...

I am using the below code to insert to a Postgres DB using tokio-postgres, is there any better option : let members = &[obj] //obj is a struct let mut params = Vec::<&(dyn ToSql + Sync)&...

In rust, is there a version of f32 / f64 that implements Eq? The only reason I can see for f32 / f64 not implementing Eq is that NaN != NaN. Potential ways such a type could behave: The type could...

Suppose I've got use polars::prelude::*; pub struct Person { id: u32, name: String, age: u32, } let df = df!( "id" => &[1,2,3], "name" => &["John"...

I am trying to iterate over each row of a Polars rust dataframe. In this endeavour, I have found df.get but the documentation says that this is slow. Then I have tried df.column("col").ge...

I'm trying to display a local time using postgres-rs, with time-rs 0.3 instead of chrono-rs 0.4. But with the timezone set to Europe/Amsterdam, all I get is UTC timestamps with no timezone informat...

I'd like to apply a user-define function which takes a few inputs (corresponding some columns in a polars DataFrame) to some columns of a polars DataFrame in Rust. The pattern that I'm using is as ...

I'm working on verifying some Rust code using SAW. SAW requires that you compile to LLVM bitcode, which you can then import and verify. I know you can generate bitcode using the --emit=llvm-bc flag...

Given something like this: struct Example { a: i32, b: String, } Is there any built-in method or any trait I can implement that will allow me to obtain a tuple of (i32, String)?

I am encountering a puzzling error when creating a tuple-like struct somewhere in my Rust project. The error I boiled my issue down to the following snippet: mod parent { pub struct X(u32); mod ...

I have written a small executable to start a WebSocket server for a Node development environment. In a separate NodeJS application (running in Electron), I am using child_process.spawn() to run the...

Consider the following situation, with two Traits. The first Trait is for pointer types, and the second Trait is for regular objects. The second trait has a HRTB so that any reference to a type tha...

If I try to build the following code: fn main () { let my_val: u32 = 42; match my_val % 2 { 0 => println!("We're even now"), 1 => println!("Well, that's odd"), } } ...

I can't figure out why I need a 'static bound in one case (bar) and not the other (baz): fn f<T>(_input: T) -> bool { false } fn bar<T>() -> Box<dyn Fn(T) -> bool + 'stati...

I am trying to make a get request to a url with rust and everytime I run this project I get this error, my other rust project work fine. here's my cargo.toml file. [package] name = "api_req&qu...

The Vectorcall protocol is a new calling convention for Python's C API defined in PEP 590. The idea is to speed up calls in Python by avoiding the need to build intermediate tuples and dicts, and i...

I don't know how to fix this error (for pip install transformer on windows): error: can't find Rust compiler If you are using an outdated pip version, it is possible a prebuilt wheel is available f...

I would like to pass in the parameters what arm of the enum I need to match, something like this: enum D { A(i64), B(u64), C(u64, u64), } let a = D.A(10); println!(a.is_of(D.A)); // true prin...

When I run cargo install cargo-binutils, I get the below error. I have gcc installed and in my path, to the point where where gcc correctly returns the location. gcc version: gcc.exe (i686-posix-...

I ran into the kind of a problem described in this question: How can I create a Tokio runtime inside another Tokio runtime without getting the error "Cannot start a runtime from within a runti...

Consider the following rust program: fn f<'a>(x: &'a i32) { unimplemented!(); } fn main() { f::<'static>; } When compiling it, the following compilation error is outputed: error...

I'm using polars and I would like to define the type of the columns while loading a dataframe. In pandas, I can use dtype: df=pd.read_csv("iris.csv", dtype={'petal_length':str}) I'm tryi...