equivariant functions

[Jeff Nowakowski]

Andrei Alexandrescu wrote:
> I agree. When considering keyword addition, I think we all should think 
> more about adding contextual keywords, which in the grand D tradition 
> are usually defined as keyword(contextual_keyword).

Is there some reason why most languages don't use a reserved symbol for 
keywords, like prefixing them with $ or %?  Every language runs into the 
problem of wanting to add new keywords later on -- why don't new 
languages avoid this old problem?

-Jeff