#![feature(core)]
#![feature(io)]
#![feature(env)]
#![feature(path)]

extern crate crc64;
use crc64::crc64;
use std::env;
use std::old_io::{BufferedReader, File};

fn main() {
    let mut args = env::args();
    let (len,_) = args.size_hint();
    let prog = args.next().unwrap();

    if len == 1 {
        println!("Usage: {} [list of files]", prog);
        return
    }

    for f in args {
        let mut crc : u64 = 0;
        let file = File::open(&Path::new(f.to_string()));
        let mut reader = BufferedReader::new(file);

        let mut error = false;
        loop {
            let mut buf = [0; 100];
            match reader.read(buf.as_mut_slice()) {
                Err(e) => {
                    if e.kind != std::old_io::EndOfFile {
                        error = true;
                        print!("error reading '{}': {}", f, e);
                    }
                    break;
                },
                Ok(nread) => crc = crc64::crc64(crc, buf[..nread].as_slice())
            }
        }

        if error == false {
            println!("{:x}  {}", crc, f);
        }
    }
}

#![feature(slicing_syntax)]

extern crate crc64;
use crc64::crc64;
use std::os;
use std::io::{BufferedReader, File};

fn main() {
    let args = os::args();
    if args.len() == 1 {
        println!("Usage: {} [list of files]", args[0]);
        return
    }

    for f in args[1..].iter() {
        let mut crc : u64 = 0;
        let file = File::open(&Path::new(f.to_string()));
        let mut reader = BufferedReader::new(file);

        let mut error = false;
        loop {
            let mut buf = [0; 100];
            match reader.read(buf.as_mut_slice()) {
                Err(e) => {
                    if e.kind != std::io::EndOfFile {
                        error = true;
                        print!("error reading '{}': {}", f, e);
                    }
                    break;
                },
                Ok(nread) => crc = crc64::crc64(crc, buf[..nread].as_slice())
            }
        }

        if error == false {
            println!("{:x}  {}", crc, f);
        }
    }
}

--- 
+++ 
@@ -1,24 +1,18 @@
-#![feature(core)]
-#![feature(io)]
-#![feature(env)]
-#![feature(path)]
+#![feature(slicing_syntax)]
 
 extern crate crc64;
 use crc64::crc64;
-use std::env;
-use std::old_io::{BufferedReader, File};
+use std::os;
+use std::io::{BufferedReader, File};
 
 fn main() {
-    let mut args = env::args();
-    let (len,_) = args.size_hint();
-    let prog = args.next().unwrap();
-
-    if len == 1 {
-        println!("Usage: {} [list of files]", prog);
+    let args = os::args();
+    if args.len() == 1 {
+        println!("Usage: {} [list of files]", args[0]);
         return
     }
 
-    for f in args {
+    for f in args[1..].iter() {
         let mut crc : u64 = 0;
         let file = File::open(&Path::new(f.to_string()));
         let mut reader = BufferedReader::new(file);
@@ -28,7 +22,7 @@
             let mut buf = [0; 100];
             match reader.read(buf.as_mut_slice()) {
                 Err(e) => {
-                    if e.kind != std::old_io::EndOfFile {
+                    if e.kind != std::io::EndOfFile {
                         error = true;
                         print!("error reading '{}': {}", f, e);
                     }
Use unstable features and new env::args
