rustfmt | An incomplete Rust pretty printer | Code Quality library

How to use rustup to install/use a specific history version of the component like: rustfmt, clippy?

My intention is that i would like to lint my code base always on a specific version of the components like rustfmt, clippy, then only upgrade the versions after i purposely did the evaluation, instead of randomly moving to the latest version.

In my application a method runs quickly once started but begins to continuously degrade in performance upon nearing completion, this seems to be even irrelevant of the amount of work (the number of iterations of a function each thread has to perform). Once it reaches near the end it slows to an incredibly slow pace compared to earlier (worth noting this is not just a result of fewer threads remaining incomplete, it seems even each thread slows down).

I cannot figure out why this occurs, so I'm asking. What am I doing wrong?

A slideshow of the problem

Worth noting that CPU temperature remains low throughout.

This stage varies with however much work is set, more work produces a better appearance with all threads constantly near 100%. Still, at this moment this appears good.

Here we see the continued performance of earlier,

Here we see it start to degrade. I do not know why this occurs.

After some period of chaos most of the threads have finished their work and the remaining threads continue, at this point although it seems they are at 100% they in actually perform their remaining workload very slowly. I cannot understand why this occurs.

I have written a multi-threaded random_search (documentation link) function for optimization. Most of the complexity in this function comes from printing data passing data between threads, this supports giving outputs showing progress like:

In trying to chain std::iter::Iterator::take_while calls together I'm losing the last values of each call.

Is there a way to chain calls together like this without skipping values?

Code Playground link:

I want to write a simple call to assert! like this

I am using the Rust extension on vscode and NOT rust-analyzer. However, when I am saving a file, vscode is using rustfmt to format my file but it doesn't automatically insert semicolons. I have a trivial function like this

I am trying to use the ndarray crate to do some bioinformatics, but I can't seem to be able to create a matrix dynamically.

I have vectors of booleans that I would like to combine into a two-dimensional array. However, trying to flatten the vectors and using into_shape does not retain a correct order of the elements.

Thus I tried to create an empty array and concatenate rows into it, however this gives me an error I cannot comprehend. I know the empty array does not have the same dimensions but I cannot find a way to cast an empty array to the correct type and dimensions.

I have a file that looks like:

I'm trying to use syn to create an AST from a Rust file and then using quote to write it to another. However, when I write it, it puts extra spaces between everything.

Note that the example below is just to demonstrate the minimum reproducible problem I'm having. I realize that if I just wanted to copy the code over I could copy the file but it doesn't fit my case and I need to use an AST.

I'm trying to write a build.rs script that creates an up-to-date HashMap that maps the first 6 characters of a MAC address with its corresponding vendor.

It has 29231 key-value pairs which causes cargo check to spend more than 7 minutes on my source code. Before this, it was less than 20 seconds. It also uses all 8GB of the RAM available on my laptop and I cannot use it during those 7-8 minutes.

I think this is either a rustc/cargo bug, or I am doing something wrong, and I'm pretty sure is the latter. What is the correct way of generating code like this?

main.rs