How to parse a float with nightly Rust?

Question

I can't find out how to parse a float from current Rust, according to the documentation I think this should work :

use std::f32;
use std::from_str::FromStr;

fn main() {
    let result = f32::from_str("3.14");
    println!("{}", result.unwrap());
}

but the compiler complains :

<anon>:5:18: 5:31 error: unresolved name `f32::from_str`.
<anon>:5     let result = f32::from_str("3.14");
                          ^~~~~~~~~~~~~

(See on Rust playpen : here)

What I am missing here ?

Answer 1

In 1.0.0 alpha~Nightly you can use std::str::StrExt::parse instead

assert_eq!("3.14".parse(), Ok(3.14f64))

Also here's a sample with your code

fn main() {
    let result: f32 = "3.14".parse().unwrap();
    println!("{}", result);
}

Playpen link