Invalid foreach aggregate

[Chris via Digitalmars-d-learn]

I've checked several options now and it doesn't work.

Here (http://dlang.org/statement.html#foreach-with-ranges) it is 
stated that it suffices to have range primitives, if opApply 
doesn't exist. My code worked up to 2.068.0, with the 
introduction of 2.068.1 it failed. I wonder why that is.

I have empty, front and popFront in my range which is a struct, 
and it used to work.