type T int

//go:noinline
func (T) M() {}

type I interface{ M() }

var p *T
var pp *I

func main() {
	p = new(T)  // use type T
	pp = new(I) // use type I
	*pp = *p    // convert T to I, build itab

	case types.TINTER:
		// struct { Itab *tab;	void *data; }
		// or, when isnilinter(t)==true:
		// struct { Type *type; void *data; }
		if off&int64(types.PtrSize-1) != 0 {
			base.Fatalf("typebits.Set: invalid alignment, %v", t)
		}
		// The first word of an interface is a pointer, but we don't
		// treat it as such.
		// 1. If it is a non-empty interface, the pointer points to an itab
		//    which is always in persistentalloc space.

}
func rewriteValuedec_OpITab(v *Value) bool {
	v_0 := v.Args[0]
	b := v.Block
	typ := &b.Func.Config.Types
	// match: (ITab (IMake itab _))
	// result: itab
	for {
		if v_0.Op != OpIMake {
			break
		}
		itab := v_0.Args[0]
		v.copyOf(itab)
		return true
	}
	// match: (ITab x:(Load <t> ptr mem))
	// cond: t.IsInterface()
	// result: @x.Block (Load <typ.Uintptr> ptr mem)
	for {
		x := v_0

}

type C struct {
}

func F() *C {
	return nil
}

var slicePtr interface{} = &[]int{}

func main() {
	defer depBase.ImplementedInAsm()
	// This code below causes various go.itab.* symbols to be generated in
	// the executable. Similar code in ../depBase/dep.go results in
	// exercising https://golang.org/issues/17594
	reflect.TypeOf(os.Stdout).Elem()
	runtime.GC()
	depBase.V = depBase.F() + 1

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// This test makes sure that itabs are unique.
// More explicitly, we require that only one itab structure exists for the pair of
// a given compile-time interface type and underlying concrete type.
// Ensuring this invariant enables fixes for 18492 (improve type switch code).

package main

type I interface {
	M()

		return false
	})
}

// itabType loads the _type field from a runtime.itab struct.
func itabType(itab ir.Node) ir.Node {
	if itabTypeField == nil {
		// internal/abi.ITab's Type field
		itabTypeField = runtimeField("Type", rttype.ITab.OffsetOf("Type"), types.NewPtr(types.Types[types.TUINT8]))
	}
	return boundedDotPtr(base.Pos, itab, itabTypeField)
}

var itabTypeField *types.Field

	X86HasSSE41     *obj.LSym
	// Wasm
	WasmDiv *obj.LSym
	// Wasm
	WasmTruncS *obj.LSym
	// Wasm
	WasmTruncU *obj.LSym
}

// Pkgs holds known packages.
var Pkgs struct {
	Go       *types.Pkg
	Itab     *types.Pkg
	Runtime  *types.Pkg
	Coverage *types.Pkg

// TFlagOff returns the offset of Type.TFlag for a compilation target with a given ptrSize
func TFlagOff(ptrSize int) int { return 2*ptrSize + 4 }

// ITabTypeOff returns the offset of ITab.Type for a compilation target with a given ptrSize

var V int = 1

var HasMask []string = []string{"hi"}

type HasProg struct {
	array [1024]*byte
}

type Dep struct {
	X int
}

func (d *Dep) Method() int {
	// This code below causes various go.itab.* symbols to be generated in
	// the shared library. Similar code in ../exe/exe.go results in
	// exercising https://golang.org/issues/17594
	reflect.TypeOf(os.Stdout).Elem()
	return 10
}

func F() int {

		// Implement interface to empty interface conversion:
		//
		// var res *uint8
		// res = (*uint8)(unsafe.Pointer(itab))
		// if res != nil {
		//    res = res.type
		// }

		// Grab its parts.
		itab := ir.NewUnaryExpr(base.Pos, ir.OITAB, c)
		itab.SetType(types.Types[types.TUINTPTR].PtrTo())
		itab.SetTypecheck(1)
		data := ir.NewUnaryExpr(n.Pos(), ir.OIDATA, c)