isMutable!(T) - intended/overlooked behaviour?

[Liam McSherry via Digitalmars-d]

On Monday, 11 January 2016 at 15:00:30 UTC, Basile B. wrote:
> The question is what do you mean by enum ?

I'm not certain of the correct term for it, but any constant 
declared as:

---
enum [<type>] <identifier> = <value>;
---

e.g.

---
enum int root_i = -1;
---