free method again, treat class as name space only

[davidl]

class A
{
    void func(){ writefln("hello"); }
}

class B
{
    void func(){ A.func(cast(A)cast(void*)this); }  // sometimes people  
need this.
}

partial class is good, but it's likely to introduce a lot compiler bugs,  
and it's likely to increase the compile time.

multiple inheritance is also nice, also likely to introduce compiler bugs,  
and multiple inheritance
make the thing more obscure sometimes, while it needs to be clear.

the solution I proposed is simple and compact. It can solve all what  
partial class & MI can solve.
It won't much bring bad taste in syntax.



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