func (tv TypeAndValue) IsVoid() bool {
	return tv.mode == novalue
}

// IsType reports whether the corresponding expression specifies a type.
func (tv TypeAndValue) IsType() bool {
	return tv.mode == typexpr
}

// IsBuiltin reports whether the corresponding expression denotes
// a (possibly parenthesized) built-in function.
func (tv TypeAndValue) IsBuiltin() bool {
	return tv.mode == builtin
}

func (tv TypeAndValue) IsVoid() bool {
	return tv.mode == novalue
}

// IsType reports whether the corresponding expression specifies a type.
func (tv TypeAndValue) IsType() bool {
	return tv.mode == typexpr
}

// IsBuiltin reports whether the corresponding expression denotes
// a (possibly parenthesized) built-in function.
func (tv TypeAndValue) IsBuiltin() bool {
	return tv.mode == builtin
}

		if i > 0 {
			s += "->"
		}
		s += p.Name()
	}
	return s
}

// objDecl type-checks the declaration of obj in its respective (file) environment.
// For the meaning of def, see Checker.definedType, in typexpr.go.
func (check *Checker) objDecl(obj Object, def *TypeName) {
	if check.conf.Trace && obj.Type() == nil {
		if check.indent == 0 {
			fmt.Println() // empty line between top-level objects for readability
		}

		switch x.mode {
		default:
			if kind == statement {
				return
			}
			msg = "is not used"
			code = UnusedExpr
		case builtin:
			msg = "must be called"
			code = UncalledBuiltin
		case typexpr:
			msg = "is not an expression"
			code = NotAnExpr
		}
		check.errorf(&x, code, "%s %s", &x, msg)

	case *ast.SendStmt:
		var ch, val operand
		check.expr(nil, &ch, s.Chan)

		switch x.mode {
		default:
			if kind == statement {
				return
			}
			msg = "is not used"
			code = UnusedExpr
		case builtin:
			msg = "must be called"
			code = UncalledBuiltin
		case typexpr:
			msg = "is not an expression"
			code = NotAnExpr
		}
		check.errorf(&x, code, "%s %s", &x, msg)

	case *syntax.SendStmt:
		var ch, val operand
		check.expr(nil, &ch, s.Chan)

		if i > 0 {
			s += "->"
		}
		s += p.Name()
	}
	return s
}

// objDecl type-checks the declaration of obj in its respective (file) environment.
// For the meaning of def, see Checker.definedType, in typexpr.go.
func (check *Checker) objDecl(obj Object, def *TypeName) {
	if check.conf._Trace && obj.Type() == nil {
		if check.indent == 0 {
			fmt.Println() // empty line between top-level objects for readability
		}

		return ast.NewIdent("nil")
	case *types.Struct:
		texpr := TypeExpr(f, pkg, typ) // typ because we want the name here.
		if texpr == nil {
			return nil
		}
		return &ast.CompositeLit{
			Type: texpr,
		}
	}
	return nil
}

// IsZeroValue checks whether the given expression is a 'zero value' (as determined by output of

}

func workloadModeForListenerClass(class istionetworking.ListenerClass) typeapi.WorkloadMode {
	switch class {
	case istionetworking.ListenerClassGateway:
		return typeapi.WorkloadMode_CLIENT
	case istionetworking.ListenerClassSidecarInbound:
		return typeapi.WorkloadMode_SERVER
	case istionetworking.ListenerClassSidecarOutbound:
		return typeapi.WorkloadMode_CLIENT
	case istionetworking.ListenerClassUndefined:

	isExpr()
}

// A TagExpr is an [Expr] for the single tag Tag.
type TagExpr struct {
	Tag string // for example, “linux” or “cgo”
}

func (x *TagExpr) isExpr() {}

func (x *TagExpr) Eval(ok func(tag string) bool) bool {
	return ok(x.Tag)
}

func (x *TagExpr) String() string {
	return x.Tag
}

func tag(tag string) Expr { return &TagExpr{tag} }

	case "bool":
		return reflect.TypeFor[bool]()
	case "nullbool":
		return reflect.TypeFor[NullBool]()
	case "int16":
		return reflect.TypeFor[int16]()
	case "nullint16":
		return reflect.TypeFor[NullInt16]()
	case "int32":
		return reflect.TypeFor[int32]()
	case "nullint32":
		return reflect.TypeFor[NullInt32]()
	case "string":
		return reflect.TypeFor[string]()
	case "nullstring":