Why this code can't take advantage from CTFE?

[Andrea Fontana via Digitalmars-d-learn]

On Friday, 5 February 2016 at 09:49:38 UTC, Luis wrote:
> Reading/parsing a JSON or a XML using std.json / std.xml could 
> be done on CTFE ?

parseJSON() from std.json doesn't work with CTFE.

But I can build objects with with my code that works over 
std.json.
So if you convert (with mixins)

{ "hello" : "world" }
to
JSOB("hello", "world)

You can parse it ar compile time. :)