reduce string ranges

[Brian Myers]

I'd like to be able to use the reduce template on a range of strings. The following:

int main(char[][] args)
{
    string[] tstarr = ["one", "two", "three"];
    writefln(reduce!("a ~ b")("", tstarr));
}

gives the following error message:

c:\dmd\bin\..\src\phobos\std\algorithm.d(289): Error: functions cannot return static array invariant(char[0u])

Is there another way to do this? I've tried both the ~ operator and the + operator.

Brian