how to test if member of instance exists/defined?

[StarGrazer via Digitalmars-d-learn]

On Wednesday, 22 March 2017 at 21:04:48 UTC, StarGrazer wrote:
> On Wednesday, 22 March 2017 at 21:02:41 UTC, StarGrazer wrote:
>> On Wednesday, 22 March 2017 at 20:53:17 UTC, crimaniak wrote:
>>> On Wednesday, 22 March 2017 at 20:35:27 UTC, StarGrazer wrote:
>>>> I've tried compiles but I guess that only checks if the code 
>>>> has valid syntax, not if it actually will compile in context.
>>>
>>> https://dlang.org/spec/traits.html#hasMember
>>
>> I tried that but D complains
>>
>> static if (hasMember!(S, "x"))
>> 	return;
>> else
>> 	s.x = 3;
>>
>>
>> D says that x doesn't exist.
>>
>
> It's not that it doesn't work but the code still trying to be 
> compiled by the compiler, when I don't want it to.
> 		

nevermind, I was being stupid! ;)