Why is immutable not possible as a result of a reduce expression?

[Andrej Mitrovic]

On 1/6/13, Jonathan M Davis <jmdavisProg at gmx.com> wrote:
> If you or someone else

It's going to have to be someone else. When someone asks something on
IRC/NG and another person responds with "it's because it's not a type
constructor", or "it's not a storage class" I get completely thrown
off and don't understand what they mean, exactly because there's no
solid definition in the docs.