Remove instance from array

[Jolly James via Digitalmars-d-learn]

On Wednesday, 5 July 2017 at 15:44:47 UTC, Igor Shirkalin wrote:
> On Wednesday, 5 July 2017 at 15:30:08 UTC, Jolly James wrote:
>>> WhatEver[] q = [];
>>>
>>> [...]
>>>
>>> auto i = new WhatEver();
>>> q[] = i;
>>>
>>
>> How does one remove that instance 'i'?
>
> What exactly do you want to remove? After a[]=i your array 
> contain a lot of references to 'i'.

I would like to know how works: removing
  - the first
  - and all
references to 'i' inside the 'q'.