alias not valid with ~

[Adam D. Ruppe via Digitalmars-d-learn]

On Thursday, 19 January 2017 at 02:15:04 UTC, rikki cattermole 
wrote:
> On 19/01/2017 3:08 PM, Ignacious wrote:
>>
>> class Y
>> {
>>    int y;
>>    alias y this;
>> }
>>
>> class X
>> {
>>    Y[] x;
>>    alias x this;
>> }

> This should not fail:
>
> X x = new X;
> x ~= 3;


Yes, it should fail. 3 is not implicitly convertible to Y under 
any circumstance. D does not support implicit constructors.

alias this only works if you ALREADY HAVE a Y, then it will 
implicitly convert Y to int. It will never go the other way 
around.