opEquals optimized away?

[anonymous via Digitalmars-d-learn]

On Tuesday, 5 May 2015 at 04:09:03 UTC, Manfred Nowak wrote:
> class C{
>   override bool opEquals( Object o){
>     return true;
>   }
> }
> unittest{
>   auto c= new C;
>   assert( c == c);
> }
>
> `rdmd --main -unittest -cov' shows, that opEquals is not 
> executed. Why?
>
> -manfred

because `c is c`

https://github.com/D-Programming-Language/druntime/blob/0ac255d7276b9b825eb6f1e677e9ee4f5ad49ca2/src/object.di#L61