Write in Rust 1.55

In Rust, writing to a file involves a few steps:

1. Open the file for writing.
2. Write the desired content to the file.
3. Close the file.

Here is an example code snippet that demonstrates how to write to a file in Rust:

use std::fs::File;
use std::io::prelude::*;
fn main() -> std::io::Result<()> {

    let mut file = File::create("output.txt")?;

    file.write_all(b"Hello, world!")?;

    Ok(())

}

In this example, we first use the File and prelude modules from the std::io library. Then, We create a new file named output.txt using the File::create() function. This function returns a Result, which is a Rust type that indicates whether the operation succeeded or not.

Then, we write the content to the file using the write_all() function, which takes a byte slice as an argument. In this case, we pass the byte slice containing the string "Hello, world!".

Finally, we return the Ok(()) value to indicate that the operation completed successfully.

Note that while this example uses ? to propagate errors, proper error handling is an important aspect when writing robust Rust code.