if st.Kind() == reflect.Pointer && sv.IsNil() {
		dv.Set(reflect.Zero(dt))
		return nil
	}
	dv.Set(reflect.New(dt.Elem()))
	switch st.Kind() {
	case reflect.Pointer, reflect.Interface:
		return fromUnstructured(sv.Elem(), dv.Elem(), ctx)
	default:
		return fromUnstructured(sv, dv.Elem(), ctx)
	}
}

func structFromUnstructured(sv, dv reflect.Value, ctx *fromUnstructuredContext) error {

	if src.IsPtr() && dst.IsPtr() && dst.Elem().NotInHeap() && !src.Elem().NotInHeap() {
		why := fmt.Sprintf(":\n\t%v is incomplete (or unallocatable), but %v is not", dst.Elem(), src.Elem())
		return ir.OXXX, why
	}
	// (b) Disallow string to []T where T is not-in-heap.
	if src.IsString() && dst.IsSlice() && dst.Elem().NotInHeap() && (dst.Elem().Kind() == types.ByteType.Kind() || dst.Elem().Kind() == types.RuneType.Kind()) {

func TestPtrSetNil(t *testing.T) {
	var i int32 = 1234
	ip := &i
	vip := ValueOf(&ip)
	vip.Elem().Set(Zero(vip.Elem().Type()))
	if ip != nil {
		t.Errorf("got non-nil (%d), want nil", *ip)
	}
}

func TestMapSetNil(t *testing.T) {
	m := make(map[string]int)
	vm := ValueOf(&m)
	vm.Elem().Set(Zero(vm.Elem().Type()))
	if m != nil {
		t.Errorf("got non-nil (%p), want nil", m)
	}
}

      // uncheckedCastNullableTToT is safe because bufferSize > 0.
      if (comparator.compare(elem, uncheckedCastNullableTToT(threshold)) > 0) {
        threshold = elem;
      }
      // uncheckedCastNullableTToT is safe because bufferSize > 0.
    } else if (comparator.compare(elem, uncheckedCastNullableTToT(threshold)) < 0) {
      // Otherwise, we can ignore elem; we've seen k better elements.
      buffer[bufferSize++] = elem;

  // CHECK-NEXT: %[[ELEM:.*]] = "tf.Reshape"(%[[SLICE]], %[[ELEM_SHAPE]]) : (tensor<1xf32>, tensor<0xi32>) -> tensor<f32>
  %get = "tf.TensorListGetItem"(%tl, %arg0, %elem_shape) : (tensor<!tf_type.variant<tensor<f32>>>, tensor<i32>, tensor<0xi32>) -> tensor<f32>
  // CHECK-NEXT: return %[[ELEM]] : tensor<f32>
  func.return %get: tensor<f32>
}

// -----

				and(notCond)
			}
		}
	} else {
		step := int64(1)
		remains := t.NumElem() * t.Elem().Size()
		combine64bit := unalignedLoad && types.RegSize == 8 && t.Elem().Size() <= 4 && t.Elem().IsInteger()
		combine32bit := unalignedLoad && t.Elem().Size() <= 2 && t.Elem().IsInteger()
		combine16bit := unalignedLoad && t.Elem().Size() == 1 && t.Elem().IsInteger()
		for i := int64(0); remains > 0; {
			var convType *types.Type
			switch {

//	  if a.ptr != b.ptr { memmove(a.ptr, b.ptr, n*sizeof(elem(a))) }
//	}
//	n;
//
// Also works if b is a string.
func walkCopy(n *ir.BinaryExpr, init *ir.Nodes, runtimecall bool) ir.Node {
	if n.X.Type().Elem().HasPointers() {
		ir.CurFunc.SetWBPos(n.Pos())
		fn := writebarrierfn("typedslicecopy", n.X.Type().Elem(), n.Y.Type().Elem())
		n.X = cheapExpr(n.X, init)
		ptrL, lenL := backingArrayPtrLen(n.X)

		return
	}
	for i := 0; i < length; i++ {
		elem := value.Index(i)
		if elemIndir > 0 {
			elem = encIndirect(elem, elemIndir)
			// TODO: Is elem guaranteed valid? If so we could avoid this check.
			if !valid(elem) {
				errorf("encodeArray: nil element")
			}
		}
		op(nil, state, elem)
	}
}

// encodeReflectValue is a helper for maps. It encodes the value v.

	case 1:
		return typecheck.LookupRuntime(name, t.Elem())
	case 2:
		return typecheck.LookupRuntime(name, t.Elem(), t.Elem())
	}
	base.Fatalf("chanfn %d", n)
	return nil
}

func mapfn(name string, t *types.Type, isfat bool) ir.Node {
	if !t.IsMap() {
		base.Fatalf("mapfn %v", t)
	}
	if mapfast(t) == mapslow || isfat {
		return typecheck.LookupRuntime(name, t.Key(), t.Elem(), t.Key(), t.Elem())
	}

	// Note that this uses / always, even on Windows, because Go import
	// paths always use forward slashes.
	path := obj.imported.path
	elem := path
	if i := strings.LastIndex(elem, "/"); i >= 0 {
		elem = elem[i+1:]
	}
	if obj.name == "" || obj.name == "." || obj.name == elem {
		check.softErrorf(obj, UnusedImport, "%q imported and not used", path)
	} else {