is my code to get CTFE instantiated object valid D ?

[Kagamin via Digitalmars-d-learn]

On Friday, 27 May 2016 at 20:20:36 UTC, chmike wrote:
> Is this code valid D or is the behavior undefined due to the 
> cast ?

A mutable object can be synchronized on:
synchronized(Category.instance){}
This will create and store a mutex in the object (sad but true, 
design taken from java). If the immutable object is in readonly 
memory, it will crash on write.