Do we really need @unsafe?

[Walter Bright]

bearophile wrote:
> Walter Bright:
> 
>> Furthermore, why would a safe module wish to expose unsafe functions? 
>> Shouldn't the programmer instead be obliged to produce trusted functions 
>> in it?
> 
> If what you say is right, then what's the purpose/advantage of using:
> module foo;
> @safe:
> 
> Instead of this?
> module(safe) foo;



...unsafe functions...
@safe:
...safe functions...
@trusted:
...trusted functions...