How do I print the type of a variable in Rust?

Question

I have the following:

let mut my_number = 32.90;

How do I print the type of my_number?

Using type and

Answer 1

You can also use the simple approach of using the variable in println!("{:?}", var). If Debug is not implemented for the type, you can see the type in the compiler's error message:

mod some {
    pub struct SomeType;
}

fn main() {
    let unknown_var = some::SomeType;
    println!("{:?}", unknown_var);
}

(playpen)

It's dirty but it works.