implicit constructors

[Trass3r]

Wasn't there some discussion quite some time ago about introducing an  
implicit/@implicit tag similar to C++'s explicit, just the other way  
around?

I know there's alias this, but what if you don't store the value directly?
struct A
{
	int store;

	this(int a)
	{
		store = a << 16;
		...
	}
}

A a = 5;