Interesting user mistake

[Adam D. Ruppe via Digitalmars-d]

On Thursday, 3 September 2015 at 18:42:37 UTC, H. S. Teoh wrote:
> Now, in C, unary + actually does something -- it causes 
> promotion of narrow ints to int. I'm not sure if it does that 
> in D as well.

what is this, javascript? a|0 :P

Seriously though, I never knew that. And I can't find where unary 
+ is defined in D... I see the grammar line, but not explanation 
of what it actually does.

Perhaps it is meant to be self-evident!