scope pointers in @safe code

[Shachar Shemesh via Digitalmars-d]

void fn(scope int* var) @safe {
     (*var)++;
}

void fn2() @safe {
     int a;

     fn(&a);
}

The above program does not compile:
d.d(8): Error: cannot take address of local a in @safe function fn2

I propose that the scope keyword be activated to mean "I do not pass the 
pointer you gave me out of the function", which would make this code 
compile (as it should, as it is not doing anything unsafe).

Shachar