fail.log

error: type `std::io::buffered::BufWriter<&mut [u8]>` does not implement any method in scope named `write_be_u32`
writer.write_be_u32::<BigEndian>(interval_ceiling).unwrap();
       ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

write.rs

use std::io::{ BufWriter, Write };
use byteorder::{ BigEndian, WriteBytesExt };
 
fn main(){
	let mut output_data = [0; 12];
    {
        let interval_ceiling = 100;
        let mut buf : &mut [u8] = &mut output_data;
        let mut writer = BufWriter::new(buf);
        writer.write_be_u32::<BigEndian>(interval_ceiling).unwrap();
    }
 
    println!("OUTPUT DATA: {:?}", output_data);
}