// an interface requires dereferencing the itab word, the misinterpretation will try to
// deference Inner.P1, causing a crash during garbage collection.
//
// This came up in a real program in issue 7725.

type Outer struct {
	*Inner
	R io.Reader
}

type Inner struct {
	X  *Outer
	P1 uintptr
	P2 uintptr
}

func (pi *Inner) M() {