}

	// Output:
	//
	// Frame
	// Z
	// a
	// bacon
	// defer
	// go
}

func ExampleSign() {
	zero := constant.MakeInt64(0)
	one := constant.MakeInt64(1)
	negOne := constant.MakeInt64(-1)

	mkComplex := func(a, b constant.Value) constant.Value {
		b = constant.MakeImag(b)
		return constant.BinaryOp(a, token.ADD, b)
	}

	vs := []constant.Value{

                                       const SliceInputs& slice_inputs) {
  SliceInputs result;
  result.input = slice_inputs.input;
  result.begin = MakeInt64(host_scope, "begin", slice_inputs.begin);
  result.size = MakeInt64(host_scope, "size", slice_inputs.size);
  result.size_as_vector = slice_inputs.size_as_vector;
  return result;
}

		var val constant.Value
		switch t := arrayPtrDeref(under(x.typ)).(type) {
		case *Basic:
			if isString(t) && id == _Len {
				if x.mode == constant_ {
					mode = constant_
					val = constant.MakeInt64(int64(len(constant.StringVal(x.val))))
				} else {
					mode = value
				}
			}

		case *Array:
			mode = value
			// spec: "The expressions len(s) and cap(s) are constants

		var val constant.Value
		switch t := arrayPtrDeref(under(x.typ)).(type) {
		case *Basic:
			if isString(t) && id == _Len {
				if x.mode == constant_ {
					mode = constant_
					val = constant.MakeInt64(int64(len(constant.StringVal(x.val))))
				} else {
					mode = value
				}
			}

		case *Array:
			mode = value
			// spec: "The expressions len(s) and cap(s) are constants

		return false // 64-bit switches on 32-bit archs
	}
	min := cc[0].lo.Val()
	max := cc[len(cc)-1].hi.Val()
	width := constant.BinaryOp(constant.BinaryOp(max, token.SUB, min), token.ADD, constant.MakeInt64(1))
	limit := constant.MakeInt64(int64(len(cc)) * minDensity)
	if constant.Compare(width, token.GTR, limit) {
		// We disable jump tables if we use less than a minimum fraction of the entries.

	name string
	kind BasicKind
	val  constant.Value
}{
	{"true", UntypedBool, constant.MakeBool(true)},
	{"false", UntypedBool, constant.MakeBool(false)},
	{"iota", UntypedInt, constant.MakeInt64(0)},
}

func defPredeclaredConsts() {
	for _, c := range predeclaredConsts {
		def(NewConst(nopos, nil, c.name, Typ[c.kind], c.val))
	}
}

func defPredeclaredNil() {

	name string
	kind BasicKind
	val  constant.Value
}{
	{"true", UntypedBool, constant.MakeBool(true)},
	{"false", UntypedBool, constant.MakeBool(false)},
	{"iota", UntypedInt, constant.MakeInt64(0)},
}

func defPredeclaredConsts() {
	for _, c := range predeclaredConsts {
		def(NewConst(nopos, nil, c.name, Typ[c.kind], c.val))
	}
}

func defPredeclaredNil() {

	// delayed until now to preserve side effects.
	t := n.X.Type()

	if t.IsPtr() {
		t = t.Elem()
	}
	if t.IsArray() {
		safeExpr(n.X, init)
		con := ir.NewConstExpr(constant.MakeInt64(t.NumElem()), n)
		con.SetTypecheck(1)
		return con
	}
	return n
}

// walkMakeChan walks an OMAKECHAN node.
func walkMakeChan(n *ir.MakeExpr, init *ir.Nodes) ir.Node {

			return false
		} else if tp != nil && tp.NumElem() >= 0 && constant.Compare(x, token.GTR, constant.MakeInt64(tp.NumElem())) {
			base.Errorf("invalid slice index %v (out of bounds for %d-element array)", r, tp.NumElem())
			return false
		} else if ir.IsConst(l, constant.String) && constant.Compare(x, token.GTR, constant.MakeInt64(int64(len(ir.StringVal(l))))) {

			// iota is the index of the current constDecl within the group
			if first < 0 || s.Group == nil || list[index-1].(*syntax.ConstDecl).Group != s.Group {
				first = index
				last = nil
			}
			iota := constant.MakeInt64(int64(index - first))

			// determine which initialization expressions to use
			inherited := true
			switch {
			case s.Type != nil || s.Values != nil:
				last = s
				inherited = false