rust : general remarks

TODO.md

@@ -26,6 +26,8 @@ Noted issues
 * Rust is not easy to install up today (version 0.11), but you can use [a repo for ubuntu](http://kianmeng.org/blog/2014/01/20/ubuntu-13-dot-10-rust-installation/)
 * Rust do warn on `isValid` , as this language prefer snake instead of camelCase : « warning: function `isValid` should have a snake case name such as `is_valid`, #[warn(non_snake_case_functions)] on by default »
 * Yes, messages in Rust are markdown ready ^^
+* In Rust, you must prepare regex before, no way to do a dynamic regex. Regex are done at compile time, not after
+* Rust is a strictly typed and anticipating compiler : if you declare a function will return a string, your function MUST return a string, whatever the branch scenario is
 * Noted (and corrected, that is the exercise goal) typos in documentations :
  * [QUnit](https://github.com/jquery/qunitjs.com/pull/77)
  * [Atoum](https://github.com/atoum/atoum/pull/345)

tests/tests.rs

@@ -28,7 +28,7 @@ fn encode(b10: &str) -> &str {
 
     match base10 {
         Some(number) => b10,
-        None         => "0"
+        None         => { b10 = "0" }
     }
     return b10
 }