Interesting Memory Optimization

[Xinok]

On Friday, 16 March 2012 at 18:56:00 UTC, Timon Gehr wrote:
> It can't because there must be a terminating zero byte. It does 
> not do it even if it could though.
>
>
> immutable string x = "123";
> immutable string y = "123";
>
> void foo(string a){
> 	string b = "123";
> 	writeln(a is b);
> }
>
> void main(){
> 	string a = "123";
> 	string b = "456";
> 	string c = "456123";
> 	foo(c[3..$]);    // false
> 	writeln(x is y); // false
> 	writeln(a is x); // false
> 	writeln(b is x); // false
> 	writeln(a is y); // false
> 	writeln(b is y); // false
> 	foo(a);          // true
> 	foo(b);          // false
> }

So while D does pool strings, it doesn't seem to optimize 
globals. I couldn't find anything about it on the bug tracker.