Appender at CTFE?

[BBasile via Digitalmars-d-learn]

On Friday, 21 August 2015 at 23:51:16 UTC, cym13 wrote:
> On Friday, 21 August 2015 at 22:39:29 UTC, Nick Sabalausky 
> wrote:
>> Not at a pc, so can't test right now, but does Appender work 
>> at compile time? If not, does ~= still blow up CTFE memory 
>> usage like it used to? Any other best practice / trick for 
>> building strings in CTFE?
>
> I did two experiments:
> 
> [...]
>
> Each make use of CTFE but the f (appender) variant blew my RAM 
> (old computer)

Excepted any error from my part, shouldn't you call '.reserve' in 
order to make the appender efficient ?