run with cargo test

gistfile1.txt

<std macros>:8:12: 35:21 error: mismatched types: expected `bool` but found `<generic integer #0>` (expected bool but found integral variable)
<std macros>:8         if !$cond {
<std macros>:9             fail!($($arg),+)
<std macros>:10         }
<std macros>:11     );
<std macros>:12 )
error: internal compiler error: unexpected failure
note: the compiler hit an unexpected failure path. this is a bug.
note: we would appreciate a bug report: http://doc.rust-lang.org/complement-bugreport.html
note: run with `RUST_BACKTRACE=1` for a backtrace
task 'rustc' failed at 'index out of bounds: the len is 12 but the index is 12', /Users/rustbuild/src/rust-buildbot/slave/nightly-mac/build/src/libsyntax/lib.rs:1

ketama.rs

extern crate crypto = "rust-crypto";

use std::io::stdio::println;
use crypto::md5::Md5;
use crypto::digest::Digest;

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

fn ketama(key: &str) -> u8 {

	// 2: Create MD5 digset
	let mut sh = Md5::new();
	sh.input_str(key);
	let mut digest = Vec::from_elem((sh.output_bits()+7)/8, 0u8);
	sh.result(digest.as_mut_slice());

	// 3: Construct the ketama hash
	let result = 
		((digest.get(3) & 0xFF) << 24) |
		((digest.get(2) & 0xFF) << 16) |
		((digest.get(1) & 0xFF) << 8)  |
		(digest.get(0) & 0xFF);

	result
}

#[cfg(test)]
mod tests {

	use ketama;

	fn test_ketama() {
		assert!(3979113294, ketama("26"));
	}
}