Question for compiler gurus about compile-time strings

[Steven Schveighoffer via Digitalmars-d-learn]

I was thinking that all strings generated at compile-time have a 
null-terminator added. But then I thought, wait, maybe that's only 
specifically for string literals.

What is the true answer? If you generate a string, let's say via a CTFE 
call, does it have a null terminator?

-Steve