Is there something special required to use Appender.clear

[FeepingCreature]

On Tuesday, 27 March 2018 at 12:31:05 UTC, Simen Kjærås wrote:
> On Tuesday, 27 March 2018 at 12:17:58 UTC, Ellie Harper wrote:
>> Sorry if this is a stupid question, but is there something 
>> special required to call Appender.clear?  When I attempt even 
>> just a simple use I am getting compile errors relating to 
>> `template object.clear`.
>
> From the documentation for Appender:
>
>> Note
>> clear is disabled for immutable or const element types, due to 
>> the possibility that Appender might overwrite immutable data.
>
> Since string is immutable(char)[], clear() is simply not 
> available for appender!string.
>
> --
>   Simen

Isn't this wrong, though? Appender controls the memory it 
references. It could just choose to allocate non-immutable memory 
internally. As long as any const data put into the appender is 
*returned* as const, there is no chance of immutable memory being 
overwritten.