//go:systemstack
func cgoCheckUsingType(typ *_type, src unsafe.Pointer, off, size uintptr) {
	if !typ.Pointers() {
		return
	}

	// Anything past typ.PtrBytes is not a pointer.
	if typ.PtrBytes <= off {
		return
	}
	if ptrdataSize := typ.PtrBytes - off; size > ptrdataSize {
		size = ptrdataSize
	}

	if typ.Kind_&abi.KindGCProg == 0 {
		cgoCheckBits(src, typ.GCData, off, size)
		return
	}

	// run time error if it has a RuntimeError method.
	RuntimeError()
}

// A TypeAssertionError explains a failed type assertion.
type TypeAssertionError struct {
	_interface    *_type
	concrete      *_type
	asserted      *_type
	missingMethod string // one method needed by Interface, missing from Concrete
}

func (*TypeAssertionError) RuntimeError() {}

func (e *TypeAssertionError) Error() string {

 * The <a href="https://docs.gradle.org/current/userguide/java_gradle_plugin.html" target="_top">java-gradle-plugin</a> adds
 * a {@code validatePlugins} task, though if you cannot use this plugin then you need to register the task yourself.
 *
 * See the user guide for more information on
 * <a href="https://docs.gradle.org/current/userguide/incremental_build.html" target="_top">incremental build</a> and

	token.MUL: "multiplication",
	token.SHL: "shift",
}

// If typ is a type parameter, underIs returns the result of typ.underIs(f).
// Otherwise, underIs returns the result of f(under(typ)).
func underIs(typ Type, f func(Type) bool) bool {
	typ = Unalias(typ)
	if tpar, _ := typ.(*TypeParam); tpar != nil {
		return tpar.underIs(f)
	}
	return f(under(typ))
}

}

// makeslicecopy allocates a slice of "tolen" elements of type "et",
// then copies "fromlen" elements of type "et" into that new allocation from "from".
func makeslicecopy(et *_type, tolen int, fromlen int, from unsafe.Pointer) unsafe.Pointer {
	var tomem, copymem uintptr
	if uintptr(tolen) > uintptr(fromlen) {
		var overflow bool
		tomem, overflow = math.MulUintptr(et.Size_, uintptr(tolen))

		check.use(e.Elt)

	case *ast.StructType:
		typ := new(Struct)
		setDefType(def, typ)
		check.structType(typ, e)
		return typ

	case *ast.StarExpr:
		typ := new(Pointer)
		typ.base = Typ[Invalid] // avoid nil base in invalid recursive type declaration
		setDefType(def, typ)
		typ.base = check.varType(e.X)
		return typ

	case *ast.FuncType:
		typ := new(Signature)
		setDefType(def, typ)

		panic("userArena.slice: negative cap")
	}
	i := efaceOf(&sl)
	typ := i._type
	if typ.Kind_&abi.KindMask != abi.Pointer {
		panic("slice result of non-ptr type")
	}
	typ = (*ptrtype)(unsafe.Pointer(typ)).Elem
	if typ.Kind_&abi.KindMask != abi.Slice {
		panic("slice of non-ptr-to-slice type")
	}
	typ = (*slicetype)(unsafe.Pointer(typ)).Elem
	// t is now the element type of the slice we want to allocate.

	}

	pos := p.pos()
	if typ := p.typeOrNil(); typ != nil {
		f := new(Field)
		f.pos = pos
		f.Type = typ
		return []*Field{f}
	}

	return nil
}

func (p *parser) addField(styp *StructType, pos Pos, name *Name, typ Expr, tag *BasicLit) {
	if tag != nil {
		for i := len(styp.FieldList) - len(styp.TagList); i > 0; i-- {
			styp.TagList = append(styp.TagList, nil)
		}

	if GOARCH != "386" {
		// cdecl is only meaningful on 386.
		cdecl = false
	}

	if fn._type == nil || (fn._type.Kind_&abi.KindMask) != abi.Func {
		panic("compileCallback: expected function with one uintptr-sized result")
	}
	ft := (*functype)(unsafe.Pointer(fn._type))

	// Check arguments and construct ABI translation.
	var abiMap abiDesc
	for _, t := range ft.InSlice() {

	// All of these objects have a header.
	var typ *_type
	if spc.sizeclass() != 0 {
		// Pull the allocation header from the first word of the object.
		typ = *(**_type)(unsafe.Pointer(addr))
		addr += mallocHeaderSize
	} else {
		typ = span.largeType
		if typ == nil {
			// Allow a nil type here for delayed zeroing. See mallocgc.
			return typePointers{}
		}
	}
	gcdata := typ.GCData