v1 = t1{x: nil} // no barrier
	v2 = t2{x: nil} // ERROR "write barrier"
}

func h() {
	// Test copies and appends.
	copy(v1s, v1s[1:])      // no barrier
	copy(v2s, v2s[1:])      // ERROR "write barrier"
	_ = append(v1s, v1s...) // no barrier
	_ = append(v2s, v2s...) // ERROR "write barrier"
}

// Slice clearing

var (
	sliceIH  []*ih
	sliceNIH []*nih
)

func sliceClear() {
	for i := range sliceIH {

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