// Implements http://rosettacode.org/wiki/Rot-13

fn rot13 (string: &str) -> String {
    fn rot13u8 (c: char) -> char {
        let d = c as u8;
        match c {
            'a' .. 'm'
            | 'A' .. 'M' => (d + 13) as char,
            'n' .. 'z'
            | 'N' .. 'Z' => (d - 13) as char,
            _ => c
        }
    }

    string.chars().map(rot13u8).collect()
}

#[cfg(not(test))]
fn main () {
    let string = "Do you love apples?";

    println!("Original: {}", string);
    println!("Encoded: {}", rot13(string));
}

#[test]
fn test_basic() {
    assert_eq!(rot13("abc").as_slice(), "nop");
}

#[test]
fn test_coherence() {
    assert!(range(50000, 50050).map(|x| format!("{}", x)).all(|s| {
        let encoded = rot13(s.as_slice());
        let decoded = rot13(encoded.as_slice());
        decoded == s
    }));
}

// Implements http://rosettacode.org/wiki/Rot-13

fn rot13 (string: &str) -> String {
    fn rot13u8 (c: char) -> char {
        let d = c as u8;
        match c {
            'a' .. 'm'
            | 'A' .. 'M' => (d + 13) as char,
            'n' .. 'z'
            | 'N' .. 'Z' => (d - 13) as char,
            _ => c
        }
    }

    string.chars().map(rot13u8).collect::<String>()
}

#[cfg(not(test))]
fn main () {
    let string = "Do you love apples?";

    println!("Original: {}", string);
    println!("Encoded: {}", rot13(string));
}

#[test]
fn test_basic() {
    assert_eq!(rot13("abc").as_slice(), "nop");
}

#[test]
fn test_coherence() {
    assert!(range(50000, 50050).map(|x| format!("{}", x)).all(|s| {
        let encoded = rot13(s.as_slice());
        let decoded = rot13(encoded.as_slice());
        decoded == s
    }));
}

--- 
+++ 
@@ -12,7 +12,7 @@
         }
     }
 
-    string.chars().map(rot13u8).collect::<String>()
+    string.chars().map(rot13u8).collect()
 }
 
 #[cfg(not(test))]
Remove unnecessary type annotation. `rustc` can figure it out itself.
