Why doesn't this chain of ndslices work?

[Stiff via Digitalmars-d-learn]

Here's the code that doesn't compile:

import std.stdio, std.experimental.ndslice, std.range, 
std.algorithm;

void main()
{
        auto alloslice = [1, 2, 3, 4].sliced(1,4);
        auto sandwich = chain(alloslice,
                (0).repeat(8).sliced(2,4),
                alloslice);
        writeln(sandwich);
}

If I comment out the line with the repeat, or allocate the repeat 
with .array(), everything is fine. I get that the types are 
incompatible in some way, but it seems like I should be able to 
lazily instantiate those zeros whenever I need to (later). Should 
this work? Is there a different way to set up all of the ranges 
without allocating everything up front?

And yeah, resources aren't particularly limited for my 
application, so allocating everything wouldn't hurt, but I'm 
trying to really understand all of these little details about 
ranges. I love them when they work, but the learning curve has 
been steep.