// This avoids allocation of a closure object.
//
// For illustration, the following call:
//
//	func(a int) {
//		println(byval)
//		byref++
//	}(42)
//
// becomes:
//
//	func(byval int, &byref *int, a int) {
//		println(byval)
//		(*&byref)++
//	}(byval, &byref, 42)
func directClosureCall(n *ir.CallExpr) {
	clo := n.Fun.(*ir.ClosureExpr)
	clofn := clo.Func

	if ir.IsTrivialClosure(clo) {

	// function. The variables in this slice are the closure function's
	// own copy of the variables, which are used within its function
	// body. They will also each have IsClosureVar set, and will have
	// Byval set if they're captured by value.
	ClosureVars []*Name

	// Enclosed functions that need to be compiled.
	// Populated during walk.
	Closures []*Func

	// Parents records the parent scope of each scope within a

func (iter *ClosureStructIter) Next() (n *ir.Name, typ *types.Type, offset int64) {
	if iter.next >= len(iter.closureVars) {
		return nil, nil, 0
	}
	n = iter.closureVars[iter.next]
	typ = n.Type()
	if !n.Byval() {
		typ = types.NewPtr(typ)
	}
	iter.next++
	offset = types.RoundUp(iter.offset, typ.Alignment())
	iter.offset = offset + typ.Size()
	return n, typ, offset

	if reflect.DeepEqual(x, y) {
		return true
	}
	if x == nil || y == nil {
		return false
	}

	xval := reflect.ValueOf(x)
	yval := reflect.ValueOf(y)
	if xval.Kind() == reflect.Ptr && xval.IsNil() ||
		yval.Kind() == reflect.Ptr && yval.IsNil() {
		return false
	}

	if valuer, ok := x.(driver.Valuer); ok {
		x, _ = valuer.Value()
	}
	if valuer, ok := y.(driver.Valuer); ok {

			// convert Addrtaken variables to SSA anyway, no point
			// in promoting them either.
			if n.Byval() && !n.Addrtaken() && ssa.CanSSA(n.Type()) {
				n.Class = ir.PAUTO
				fn.Dcl = append(fn.Dcl, n)
				s.assign(n, s.load(n.Type(), ptr), false, 0)
				continue
			}

			if !n.Byval() {
				ptr = s.load(typ, ptr)
			}
			s.setHeapaddr(fn.Pos(), n, ptr)
		}
	}

	// Check that constants are representable by uint, but do not convert them
	// (see also go.dev/issue/47243).
	var yval constant.Value
	if y.mode == constant_ {
		// Provide a good error message for negative shift counts.
		yval = constant.ToInt(y.val) // consider -1, 1.0, but not -1.1
		if yval.Kind() == constant.Int && constant.Sign(yval) < 0 {
			check.errorf(y, InvalidShiftCount, invalidOp+"negative shift count %s", y)
			x.mode = invalid

	// Check that constants are representable by uint, but do not convert them
	// (see also go.dev/issue/47243).
	var yval constant.Value
	if y.mode == constant_ {
		// Provide a good error message for negative shift counts.
		yval = constant.ToInt(y.val) // consider -1, 1.0, but not -1.1
		if yval.Kind() == constant.Int && constant.Sign(yval) < 0 {
			check.errorf(y, InvalidShiftCount, invalidOp+"negative shift count %s", y)
			x.mode = invalid

</pre>

<p>
Although the examples above use non-interface types, it is also legal to create a method value
from a value of interface type.
</p>

<pre>
var i interface { M(int) } = myVal
f := i.M; f(7)  // like i.M(7)
</pre>


<h3 id="Index_expressions">Index expressions</h3>

<p>
A primary expression of the form
</p>

<pre>
a[x]
</pre>

<p>

</pre>

<p>
Although the examples above use non-interface types, it is also legal to create a method value
from a value of interface type.
</p>

<pre>
var i interface { M(int) } = myVal
f := i.M; f(7)  // like i.M(7)
</pre>


<h3 id="Index_expressions">Index expressions</h3>

<p>
A primary expression of the form
</p>

<pre>
a[x]
</pre>

<p>