fullyQualifiedName doesn't work with SortedRange

[Timothee Cour]

why doesn't this compile?
----
import std.traits;
import std.algorithm;

void main(){
    auto a=sort([1]);
    enum t=fullyQualifiedName!(typeof(a));
    pragma(msg,t);
}
----
CT error: std/traits.d(298): Error: forward reference of variable parentPrefix

Timothee Cour