rust Archives - Page 3 of 3

How do I print the type of a variable?

I have the following: let mut my_number = 32.90; How do I print the type of my_number? Using type and type_of did not ...

May 11, 2022
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Why does the Rust compiler not optimize code assuming that two mutable references cannot alias?

As far as I know, reference/pointer aliasing can hinder the compiler’s ability to generate optimized code, since they must ensure the generated binary ...

May 10, 2022
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How to disable unused code warnings in Rust?

struct SemanticDirection; fn main() {} warning: struct is never used: `SemanticDirection` --> src/main.rs:1:1 | 1 | struct SemanticDirection; | ^^^^^^^^^^^^^^^^^^^^^^^^^ | = note: ...

May 10, 2022
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How do I concatenate strings?

How do I concatenate the following combinations of types: str and str String and str String and String 8 Answers 8

May 9, 2022
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Why doesn’t println! work in Rust unit tests?

I’ve implemented the following method and unit test: use std::fs::File; use std::path::Path; use std::io::prelude::*; fn read_file(path: &Path) { let mut file = File::open(path).unwrap(); ...

May 5, 2022
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What are the differences between Rust’s `String` and `str`?

Why does Rust have String and str? What are the differences between String and str? When does one use String instead of str ...

April 26, 2022
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