func Exit(code int) {
	for i := len(atExitFuncs) - 1; i >= 0; i-- {
		f := atExitFuncs[i]
		atExitFuncs = atExitFuncs[:i]
		f()
	}
	os.Exit(code)
}

// To enable tracing support (-t flag), set EnableTrace to true.
const EnableTrace = false

// forEachGC calls fn each GC cycle until it returns false.
func forEachGC(fn func() bool) {
	type T [32]byte // large enough to avoid runtime's tiny object allocator

	var finalizer func(*T)

func typecheckrangeExpr(n *ir.RangeStmt) {
}

// type check assignment.
// if this assignment is the definition of a var on the left side,
// fill in the var's type.
func tcAssign(n *ir.AssignStmt) {
	if base.EnableTrace && base.Flag.LowerT {
		defer tracePrint("tcAssign", n)(nil)
	}

	if n.Y == nil {
		n.X = AssignExpr(n.X)
		return
	}

	lhs, rhs := []ir.Node{n.X}, []ir.Node{n.Y}
	assign(n, lhs, rhs)

// This is used to prevent data races in the back end.
func CalcSize(t *Type) {
	// Calling CalcSize when typecheck tracing enabled is not safe.
	// See issue #33658.
	if base.EnableTrace && SkipSizeForTracing {
		return
	}
	if PtrSize == 0 {
		// Assume this is a test.
		return
	}

	if t == nil {
		return
	}

	if t.width == -2 {
		t.width = 0
		t.align = 1

	})
	t.SetNoalg(true)
	return t
}

// type check function definition
// To be called by typecheck, not directly.
// (Call typecheck.Func instead.)
func tcFunc(n *ir.Func) {
	if base.EnableTrace && base.Flag.LowerT {
		defer tracePrint("tcFunc", n)(nil)
	}

	if name := n.Nname; name.Typecheck() == 0 {
		base.AssertfAt(name.Type() != nil, n.Pos(), "missing type: %v", name)
		name.SetTypecheck(1)
	}

		}
	}

	return l, r, t
}

// The result of tcCompLit MUST be assigned back to n, e.g.
//
//	n.Left = tcCompLit(n.Left)
func tcCompLit(n *ir.CompLitExpr) (res ir.Node) {
	if base.EnableTrace && base.Flag.LowerT {
		defer tracePrint("tcCompLit", n)(&res)
	}

	lno := base.Pos
	defer func() {
		base.Pos = lno
	}()

	ir.SetPos(n)

	t := n.Type()

//
//	n.Left = typecheck(n.Left, top)
func typecheck(n ir.Node, top int) (res ir.Node) {
	if n == nil {
		return nil
	}

	// only trace if there's work to do
	if base.EnableTrace && base.Flag.LowerT {
		defer tracePrint("typecheck", n)(&res)
	}

	lno := ir.SetPos(n)
	defer func() { base.Pos = lno }()

	// Skip typecheck if already done.