sink = new(embed3)      // ERROR "can't be allocated in Go"
	sink = new(embedAlias1) // ERROR "can't be allocated in Go"
	sink = new(embedAlias2) // ERROR "can't be allocated in Go"

	// Test for special case of OMAKESLICECOPY
	x := make([]nih, n) // ERROR "can't be allocated in Go"
	copy(x, z)
	z = x
}

// Writes don't produce write barriers.

var p *nih

//go:nowritebarrier
func h() {
	y.next = p.next

// type, and returns an expression that yields the *runtime._type
// value representing that slice type's element type.
func MakeSliceElemRType(pos src.XPos, n *ir.MakeExpr) ir.Node {
	assertOp2(n, ir.OMAKESLICE, ir.OMAKESLICECOPY)
	if hasRType(n, n.RType, "RType") {
		return n.RType
	}
	return sliceElemRType(pos, n.Type())
}

// RangeMapRType asserts that n is a "range" loop over a map value,

		n := n.(*ir.SliceHeaderExpr)
		return tcSliceHeader(n)

	case ir.OSTRINGHEADER:
		n := n.(*ir.StringHeaderExpr)
		return tcStringHeader(n)

	case ir.OMAKESLICECOPY:
		n := n.(*ir.MakeExpr)
		return tcMakeSliceCopy(n)

	case ir.OSLICE, ir.OSLICE3:
		n := n.(*ir.SliceExpr)
		return tcSlice(n)

	// call and call like
	case ir.OCALL:
		n := n.(*ir.CallExpr)
		return tcCall(n, top)

		orderMakeSliceCopy(s[i:])
		o.stmt(s[i])
	}
}

// orderMakeSliceCopy matches the pattern:
//
//	m = OMAKESLICE([]T, x); OCOPY(m, s)
//
// and rewrites it to:
//
//	m = OMAKESLICECOPY([]T, x, s); nil
func orderMakeSliceCopy(s []ir.Node) {
	if base.Flag.N != 0 || base.Flag.Cfg.Instrumenting {
		return
	}
	if len(s) < 2 || s[0] == nil || s[0].Op() != ir.OAS || s[1] == nil || s[1].Op() != ir.OCOPY {

			return true
		}

	// Only possible side effect is panic on invalid size.
	// TODO(rsc): Merge with previous case (probably breaks toolstash -cmp).
	case ir.OMAKESLICE, ir.OMAKESLICECOPY:
		return true
	}
	return false
}

// AnySideEffects reports whether n contains any operations that could have observable side effects.
func AnySideEffects(n ir.Node) bool {

		return walkMakeChan(n, init)

	case ir.OMAKEMAP:
		n := n.(*ir.MakeExpr)
		return walkMakeMap(n, init)

	case ir.OMAKESLICE:
		n := n.(*ir.MakeExpr)
		return walkMakeSlice(n, init)

	case ir.OMAKESLICECOPY:
		n := n.(*ir.MakeExpr)
		return walkMakeSliceCopy(n, init)

	case ir.ORUNESTR:
		n := n.(*ir.ConvExpr)
		return walkRuneToString(n, init)

	case ir.OBYTES2STR, ir.ORUNES2STR: