half.go

type I interface {
  Func()
}
type I2 interface {
  Another()
}
type I3 interface {
  Func()
  Another()
}

// If half the functinos are in the base struct
type Iimpl struct{}
func (i *Iimpl) Func(){}

// And half are in the larger struct
type I2impl struct{
  wraps(Iimpl)
}
func (i *I2impl) Another(){}

x := I2impl{}
// Does that struct implement the combination interface?
_, isBoth := x.(I3)