Do string mixins work under -betterC?

[DLearner]

On Wednesday, 17 December 2025 at 14:18:22 UTC, Richard (Rikki) 
Andrew Cattermole wrote:
>
> On 18/12/2025 3:15 AM, DLearner wrote:
>> On Wednesday, 17 December 2025 at 00:13:42 UTC, Richard 
>> (Rikki) Andrew Cattermole wrote:
>> [...]
>>>>> string genStuff(string val) {
>>>>>     return val ~ ";";
>>>>> }
>>>>>
>>>>> void myFunc() {
>>>>>     mixin(genStuff("this"));
>>>>> }
>> [...]
>>>>> This won't work without a way to mark `genStuff` as CTFE 
>>>>> only. Which doesn't exist currently.
>>>>>
>>>>> Compiler has to know that a given execution context is CTFE 
>>>>> only otherwise disallowed.
>>>>
>>>> 1. Any proposals to mark a function as CTFE only?
>>>
>>> No, this is something that should've been done a while back.
>>>
>>> The main concern is that you can get a linker error if you 
>>> don't emit a function that was called.
>> 
>> Actually, in your example, don't see the problem.
>> 'mixin' operates to provide text to the compiler _prior to_ 
>> run time.
>> Therefore, even if 'genStuff()' has a run-time (as well as) 
>> compile-time meaning,
>> the use of mixin should force the compile-time meaning to be 
>> taken.
>> So no ambiguity?
>> DL
>
> genStuff will still compile into the binary.
>
> The error happens when it tries to do that, not when it tries 
> to run it for the string mixin.

And a suitably placed 'if (__ctfe) {...} else {}' within genStuff 
doesn't help?
Idea is to tell the compiler that compilation for execution is 
entirely redundant.
DL