Weird error when compiling.

[Agustin]

On Sunday, 20 October 2013 at 02:14:55 UTC, TheFlyingFiddle wrote:
>> Anyway to evaluate the name of the class and return its hash 
>> at compile time?
>
> I couldn't find the built in hash unction for strings so i used 
> the one from http://dlang.org/hash-map.html as an example. More 
> advanced and better hash functions can be found online.
>
> public class ComponentDetail(T) : Component {
> 	////////////////////////////////////////////////////////////
> 	/// Component's ID as static member.
> 	public static hash_t ID = hash!(T);
> }
>
> hash_t hash(T)()
> {
>     hash_t hash;
>     foreach (char c; T.stringof)
>         hash = (hash * 9) + c;
>     return hash;
> }

Works perfectly :), now if i want to implement the same but
rather do something like

template GetHash(string character, hash_t hash = 0, size_t index
= 0) {
	static if (character[index])
		enum GetHash = GetHash(character, hash = (hash * 9) +
character[index], ++index);
	else
		enum GetHash = hash;
}

How should i implement it?