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.
