[phobos] Filter horribly broken

[David Simcha]

I'm receiving a rather inscrutable compile time error on the following 
test program on 2.048 beta:

import std.stdio, std.algorithm, std.string;

void main() {
     auto file = filter!"a.length > 0"(
         File("foo.txt").byLine()
     );
}

Error: function std.algorithm.filter!("a.length > 
0").filter!(ByLine!(char,char)).filter cannot access frame of function this

Apparently sometime between 2.047 and the beta, the Filter struct was 
nested inside filter().  Can we just change this back for the next 
release?  If not, I won't be able to use 2.048 w/o manually patching 
Phobos on all the machines I use D on because too much of my code 
depends on Filter.