Create empty SList or DList.

[bauss]

Is there a way to achieve that instead of something hacky like 
adding an initialized element and then removing it.

Ex. instead of:

auto stack = SList!int(0);
stack.removeFront();

Then something that just allowed you to do:
auto stack = SList!int; // Not allowed.

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I feel like this makes containers like that a big hassle in D 
because you may not wanna initialize the elements of them right 
away.