I'm confused by this output. It appears that the interface of two different
pointers to an empty struct are equal. In all other cases, interface
equality seems to be the pointer equality. What's going on in the empty
struct case?
```
package main
import "fmt"
type Foo struct {
}
func (self *Foo) Hello() {
}
type FooWithValue struct {
A int
}
func (self *FooWithValue) Hello() {
}
type Bar interface {
Hello()
}
func main() {
a := &Foo{}
b := &Foo{}
fmt.Printf("%t\n", *a == *b)
fmt.Printf("%t\n", a == b)
fmt.Printf("%t\n", Bar(a) == Bar(b))
c := &FooWithValue{A: 1}
d := &FooWithValue{A: 1}
fmt.Printf("%t\n", *c == *d)
fmt.Printf("%t\n", c == d)
fmt.Printf("%t\n", Bar(c) == Bar(d))
}
```
Prints (emphasis added on the strange case):
```
true
false
**true**
true
false
false
```
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