Implementing a tree with recursive Algebraic

[Kamil Koczurek]

Hi,
I'm trying to implement a simple tree and this 3-liner was my 
initial idea:

struct Tree(T) {
   Algebraic!(Tree, T)[] content;
}

But it doesn't work and I get the following error message:
/.../variant.d(...): Error: struct `app.Tree` no size because of 
forward reference
/.../variant.d(...): Error: template instance 
`std.variant.maxSize!(Tree, string)` error instantiating
source/app.d(10,3):        instantiated from here: 
`Algebraic!(Tree, string)`

Can I somehow fix this, or is my approach inherently flawed?