Why version() ?

[Walter Bright]

Joel C. Salomon wrote:
> Walter Bright wrote:
>> So I suggest:
>>
>> version (SomeFeature)
>> {
>>     codeForFeature();
>> }
>>
>> is clearer, even if SomeFeature is the default.
> 
> Apologies if this is obvious, but:
> • How do you set SomeFeature as default? and

Either via the command line, or by the statement:

version = SomeFeature;


> • How do you declare the non-implementation of SomeFeature?

Don't declare the version SomeFeature.