What are (were) the most difficult parts of D?

[jmh530]

On Thursday, 12 May 2022 at 15:32:24 UTC, Adam D Ruppe wrote:
> On Thursday, 12 May 2022 at 15:18:34 UTC, jmh530 wrote:
>> What's the difference between a Type and Type Identifier?
>
> The is expression roughly follows variable declaration style.
>
> You write
>
> int a;
>
> to declare a new symbol named `a` of type `int`.
>
> Similarly,
>
> static if(is(T a))
>
> declares a new symbol of type `a` if `T` is a valid type. (Of 
> course, in this case, a and T are aliases of each other, so it 
> isn't super useful, but in the more complex matches using the 
> == and : operators, it might be different.)
>
> The Identifier is optional.

Ah, yeah I know about that.