// 2. src and dst have identical underlying types
// and either src or dst is not a named type or
// both are empty interface types.
// For assignable but different non-empty interface types,
// we want to recompute the itab.
if eqtype(src.Orig, dst.Orig) && (src.Sym == nil || dst.Sym == nil || src.IsEmptyInterface()) {
	return OCONVNOP
}

package main

type I interface {
	M()
}

type T struct{}

func (*T) M() {}

func main() {
	t := new(T)
	var i1, i2 I
	var j interface {
		M()
	}
	i1 = t
	j = t
	i2 = j
	println(i1 == i2)
}