// license that can be found in the LICENSE file.

package main

import (
	"fmt"
)

type E[T any] struct {
	v T
}

type S1 struct {
	E[int]
	v string
}

type Eint = E[int]
type Ebool = E[bool]
type Eint2 = Eint

type S2 struct {
	Eint
	Ebool
	v string
}

type S3 struct {
	*E[int]
}

func main() {
	s1 := S1{Eint{2}, "foo"}
	if got, want := s1.E.v, 2; got != want {

package codegen

// This file contains code generation tests related to the handling of
// struct types.

// ------------- //
//    Zeroing    //
// ------------- //

type Z1 struct {
	a, b, c int
}

func Zero1(t *Z1) { // Issue #18370
	// amd64:`MOVUPS\tX[0-9]+, \(.*\)`,`MOVQ\t\$0, 16\(.*\)`
	*t = Z1{}
}

type Z2 struct {
	a, b, c *int
}

func Zero2(t *Z2) {

package main

import "os"

var fail int

func check(b bool, msg string) {
	if (!b) {
		println("failure in", msg)
		fail++
	}
}

type I1 interface { Get() int; Put(int) }

type S1 struct { i int }
func (p S1) Get() int { return p.i }
func (p S1) Put(i int) { p.i = i }

func f1() {
	s := S1{1}
	var i I1 = s
	i.Put(2)
	check(i.Get() == 1, "f1 i")
	check(s.i == 1, "f1 s")
}

			x = make(chan *byte, 8)
		}
		close(x)
	})
	b.Run("Struct", func(b *testing.B) {
		b.Run("0", func(b *testing.B) {
			var x chan struct0
			for i := 0; i < b.N; i++ {
				x = make(chan struct0, 8)
			}
			close(x)
		})
		b.Run("32", func(b *testing.B) {
			var x chan struct32
			for i := 0; i < b.N; i++ {
				x = make(chan struct32, 8)
			}
			close(x)
		})
		b.Run("40", func(b *testing.B) {

### New structs package

The new [structs] package provides
types for struct fields that modify properties of
the containing struct type such as memory layout.

In this release, the only such type is
[`HostLayout`](/pkg/structs#HostLayout)
which indicates that a structure with a field of that
type has a layout that conforms to host platform

var bigPtrType = reflect.ArrayOf(16385, ptrType)

var x0 = reflect.New(reflect.StructOf([]reflect.StructField{
	{Name: "F1", Type: byteType},
	{Name: "F2", Type: bigPtrType},
}))
var x1 = reflect.New(reflect.StructOf([]reflect.StructField{
	{Name: "F1", Type: smallPtrType},
	{Name: "F2", Type: bigPtrType},
}))
var x2 = reflect.New(reflect.StructOf([]reflect.StructField{
	{Name: "F1", Type: mediumPtrType},

package p

type Struct struct {
	X int
	Y float64
}

type BigStruct struct {
	X int
	Y float64
	A [1 << 20]int
	Z string
}

type Empty struct {
}

type Empty1 struct {
	Empty
}

var (
	intp       *int
	arrayp     *[10]int
	array0p    *[0]int
	bigarrayp  *[1 << 26]int
	structp    *Struct
	bigstructp *BigStruct
	emptyp     *Empty

// Methods of reflect.rtype use StructOf and FuncOf which in turn depend on
// reflect.Value.Method. StructOf and FuncOf must not disable the DCE.

package main

import "reflect"

type S int

func (s S) M() { println("S.M") }

func (s S) N() { println("S.N") }

type T float64

func (t T) F(s S) {}

func useStructOf() {
	t := reflect.StructOf([]reflect.StructField{
		{
			Name: "X",

//     a struct of n consecutive fields of the array's element type.
//   - The size of a struct is the offset of the last field plus that
//     field's size. As with all element types, if the struct is used
//     in an array its size must first be aligned to a multiple of the
//     struct's alignment.
//   - All other types have size WordSize.
//   - Arrays and structs are aligned per spec definition; all other

}

func TestIsRegularMemory(t *testing.T) {
	type args struct {
		t reflect.Type
	}
	type S struct {
		int
	}
	tests := []struct {
		name string
		args args
		want bool
	}{
		{"struct{i int}", args{reflect.TypeOf(struct{ i int }{})}, true},
		{"struct{}", args{reflect.TypeOf(struct{}{})}, true},
		{"struct{i int; s S}", args{reflect.TypeOf(struct {
			i int
			s S
		}{})}, true},