```d
import std, core.lifetime;
struct Node {
Node* pNext;
void func() { "Node::func %s".writeln( pNext); }
}
void func( Node* p ) { "::func %s(%s)".writeln( p, p == null ? p
: p.next); }
void main()
{
Node n;
auto pn = &n; //cast( Node* )0;
pn.func(); // prints: Node::func
// WTF?
// why called Node::func for Node* when ::func is right
choice for it?
}
```
problem:
member func has invariant that **this** is not null (programmer
thinks so).
global func hasn't the one and programmer should check for it
before doing something.
when pn is null u've got AccessViolation/Signal_11 with no
stacktrace.
workaround:
avoid overloaded UFCS for pointers
