from_str producing an unresolved name error

[davidenglishmusic]

I am using the following code to get an integer from a string:

fn main() {
  let number: Option<uint> = from_str("5");
}

In compiling, it generates the following:

test2.rs:2:30: 2:38 error: unresolved name from_str
test2.rs:2 let number: Option = from_str("5");
^~~~~~~~
error: aborting due to previous error

System information:
OS X 10.10.1
rustc 0.13.0-dev
binary: rustc
commit-hash: unknown
commit-date: unknown
host: x86_64-apple-darwin
release: 0.13.0-dev

Rust was installed on the eve of January 3, 2015 using brew install rust --HEAD

[jfager]

Not a bug; the FromStr trait was removed from the prelude recently, just add use std::from_str::FromStr; to get it back.

[steveklabnik]

That's correct. Also, parse is the preferred method instead.

[GildedHonour]

@steveklabnik , is what "parse" method?

[thomasbratt]

@GildedHonour As of 1.0 you can use this syntax:

let value = temp.parse::<u32>();

[steveklabnik]

@GildedHonour whoops! Sorry I missed this. @thomasbratt is correct.

[steveklabnik]

You can also let value: u32 = temp.parse().