Concat enum of strings into one string

[Andrey via Digitalmars-d-learn]

Hello,
I have a enum:

enum Type : string
{
    One = "Q1",
    Two = "W2",
    Three = "R3"
}

I want to concat it in compile-time:

enum result = doConcat!Type();

And get this result:

writeln(result); // output: "Q1 W2 R3"

Delimiter here is space symbol.
How do do it?