alias base._ctor is not as powerful as i thought

[DavidL]

class base
{
	int j;
	this(char[] hello){}
	this(int k){}
	this(){}
}
class inherit:base
{
	int k;
	float myfloat;
	alias base._ctor _ctor;
	this(){}
	void show(){writefln("%d%d",k,j);}
}

void main()
{
	base uber = new inherit(3);
	(cast(inherit)uber).k=40;
         // assertion fails here
	assert((cast(inherit)uber).myfloat == float.nan);	// it's sad it's not NAN
}

Yet, after some though for a while, it's the correct behavior to force  
users to cast & thus
no RAII for derived class members. But this makes alias base._ctor _ctor;  
some what unusable
If there's any way of making it smarter would be nicer :D
like autogen wrapper for alias _ctor with

this(protocal)
{
    super.this
}

current behavior is a bit low level, and it could hide some problems, if  
users're not aware of
the current behavior.

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