GL binding error

Cargo output

   Compiling Viewdo v0.0.1 (file:///home/ralpht/homework/viewdo/rust)
/home/ralpht/homework/viewdo/rust/src/main.rs:10:27: 10:31 error: Expected a generator argument name, either: `api`, `profile`, `version`, `generator`, or `extensions`.
/home/ralpht/homework/viewdo/rust/src/main.rs:10     generate_gl_bindings!("gl", "core", "2.0", "static")
                                                                           ^~~~
error: aborting due to previous error
Could not compile `Viewdo`.

main.rs

#![feature(phase)]
#![feature(globs)]

#[phase(plugin)]
extern crate gl_generator;
extern crate gl_init;
extern crate libc;

mod gl {
    generate_gl_bindings!("gl", "core", "2.0", "static")
}

fn main() {
    println!("Hello, world!");
}