Downs' proposal, cooperate with linker to emit message?

[davidl]

The only problem is leaving the mesesages to link-time, not compile-time,
while I think it's totally acceptable for the missing method error. Cause
library writers should always keep in mind they offer a full set of  
methods,
and users who forget to implement one method till link time could only
blame himself for his stupidity.


> The problem of leaving a method outside the class would complicate the  
> compiler forward reference.
> while the idea is the unified mangle method could generate code without  
> knowing forward references only
> when you want the compiler emit error messages when programmer calls a  
> method which doesn't exist.
> well the idea here is cooperate with linker , the linker would emit  
> missing blahblah symbol, and the
> compiler could use the symbol to emit reasonable compile message. And  
> now everything goes fine.
> No slowening compiler speed while with reasonable compile message
>



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