How to foreach over a DList?

[Jeroen Bollen]

I am trying to foreach over a std.container.DList but it isn't 
working. I have tried the following code: 
https://gist.github.com/Binero/f30e56351baf05f1a2ec

I am getting the following errors:

/usr/include/dlang/dmd/std/container.d(1925): Error: template 
std.container.DList!ubyte.DList.insertBeforeNode cannot deduce 
function from argument types !()(typeof(null), int), candidates 
are:
/usr/include/dlang/dmd/std/container.d(2096):        
std.container.DList!ubyte.DList.insertBeforeNode(Stuff)(Node* n, 
Stuff stuff) if (isInputRange!Stuff && 
isImplicitlyConvertible!(ElementType!Stuff, T))
/usr/include/dlang/dmd/std/container.d(2155):        
std.container.DList!ubyte.DList.insertBeforeNode(Stuff)(Node* n, 
Stuff stuff) if (isImplicitlyConvertible!(Stuff, T))
source/app.d(7): Error: template instance 
std.container.DList!ubyte.DList.insertBack!int error instantiating
source/app.d(11): Error: invalid foreach aggregate list1