static class vs. static struct

[Daniel Kozak via Digitalmars-d-learn]

On Tuesday, 27 January 2015 at 09:01:39 UTC, ref2401 wrote:
> For several times I've met struct(or static struct) usage in 
> Phobos for singleton pattern implementation. Unfortunately now 
> i can remember only core.runtime.Runtime.
> So I've got a question. Why do Phobos guys use struct or static 
> struct for or singleton pattern implementation? Why don't use 
> static final class for this purpose?

I do not think this is a singleton pattern (no instance). I see 
it much more like namespace in case of core.runtime.Runtime. And 
yes static final class could do that too but struct looks better 
than final class and you can disable this on structs