module(system) Identifier;

[BCS]

Reply to Andrei,

> IMHO it is better to keep system-fu at the module level instead of
> sprinkled all over. This is exactly a case when, counter-intuitively,
> more restrictive is better. This restrictions will help people
> organize code with few low-level modules supporting a large number of
> safe modules, instead of fostering insertion of inline unsafe things
> whenever it seems fit.
> 
> Andrei
> 

That's reasonable. OTOH it could end in the "Make it all public" syndrome 
if someone just gets tired of excising the really unsafe parts. I think a 
'try the current thing and see what happens' approach will be best, for now.