does std.file.slurp work with string data field?

[Big Tummy]

I have a file containing data like,

--- data.txt ---
abc, 1
def, 2
--- end data.txt ---

I try to read in the data like following, but the the codes do 
not compile:

--- mytest.d ---
import std.file, std.stdio;
void main() {
     auto arr = "data.txt".slurp!(string, int)("%s, %s");
     foreach(a; arr) {
         writefln("%s: %d", a[0], a[1]);
     }
}
--- end mytest.d ---

Any idea?

Thanks in advance,
Big Tummy