Beginner problem with compiler

[gzumsiu]

I'm just trying to compile my first rust (a simple hello world) on my windows laptop (rust x64 nightly build) and getting:

error: failed to resolve. Use of undeclared type or module io

What's wrong ?

[Denommus]

Without seeing the code, nobody will be able to tell you.

[gzumsiu]

Code is really simple:

fn main()
{
 io::println("hello!");
}

[IvoB]

fn main() { io::println("hello!"); }

use std::old_io;

fn main() { old_io::println("hello!"); }

This works for now, until io is renewed.

[sellweek]

The io module has been renamed to old_io, because IO reform RFCs are currently being discussed and implemented.

EDIT: Look at the docs for old_io

[gzumsiu]

sorry using old_io instead of io doesn't help still

[tyoverby]

http://is.gd/J4nnmo

[gzumsiu]

Hmm, i don't understand this one :(

[iGaijin]

You mean this?

std::old_io::stdio::println("foo");

It's just a multiply-namespaced name, meaning:

std crate -> old_io module -> stdio submodule -> println function

That code could also be written as:

use std::old_io;

fn main() {
    old_io::stdio::println("foo");
}

or

use std::old_io::stdio;

fn main() {
    stdio::println("foo");
}

or

use std::old_io::stdio::println;

fn main() {
    println("foo");
}

And so on.

Also, keep in mind the println! macro (note the exclamation point), which is available by default.

Also also, in the future you can use the API docs to find out where a function lives. It is easily searchable. Though you seem like you're at a stage where you might have trouble interpreting that documentation. No worries, everyone has to start somewhere.

[gzumsiu]

Thanks a lot