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util/syspolicy/setting: make setting.RawItem JSON-marshallable

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We add setting.RawValue, a new type that facilitates unmarshalling JSON numbers and arrays
as uint64 and []string (instead of float64 and []any) for policy setting values.
We then use it to make setting.RawItem JSON-marshallable and update the tests.

Updates #12687

Signed-off-by: Nick Khyl <nickk@tailscale.com>
This commit is contained in:
Nick Khyl 2024-10-29 11:24:46 -05:00 committed by Nick Khyl
parent 2cc1100d24
commit 2a2228f97b
4 changed files with 336 additions and 141 deletions
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2
types/opt/value.go
View File

@ -36,7 +36,7 @@ func ValueOf[T any](v T) Value[T] {
}
// String implements [fmt.Stringer].
func (o *Value[T]) String() string {
func (o Value[T]) String() string {
if !o.set {
return fmt.Sprintf("(empty[%T])", o.value)
}

121
util/syspolicy/setting/raw_item.go
View File

@ -5,7 +5,11 @@
import (
"fmt"
"reflect"
jsonv2 "github.com/go-json-experiment/json"
"github.com/go-json-experiment/json/jsontext"
"tailscale.com/types/opt"
"tailscale.com/types/structs"
)
@ -18,9 +22,14 @@
// hierarchies, and must be supported at this layer.
type RawItem struct {
_ structs.Incomparable
value any
err *ErrorText
origin *Origin // or nil
data rawItemJSON
}
// rawItemJSON holds JSON-marshallable data for [RawItem].
type rawItemJSON struct {
Value RawValue `json:",omitzero"`
Error *ErrorText `json:",omitzero"` // or nil
Origin *Origin `json:",omitzero"` // or nil
}
// RawItemOf returns a [RawItem] with the specified value.
@ -30,20 +39,20 @@ func RawItemOf(value any) RawItem {
// RawItemWith returns a [RawItem] with the specified value, error and origin.
func RawItemWith(value any, err *ErrorText, origin *Origin) RawItem {
return RawItem{value: value, err: err, origin: origin}
return RawItem{data: rawItemJSON{Value: RawValue{opt.ValueOf(value)}, Error: err, Origin: origin}}
}
// Value returns the value of the policy setting, or nil if the policy setting
// is not configured, or an error occurred while reading it.
func (i RawItem) Value() any {
return i.value
return i.data.Value.Get()
}
// Error returns the error that occurred when reading the policy setting,
// or nil if no error occurred.
func (i RawItem) Error() error {
if i.err != nil {
return i.err
if i.data.Error != nil {
return i.data.Error
}
return nil
}
@ -51,17 +60,103 @@ func (i RawItem) Error() error {
// Origin returns an optional [Origin] indicating where the policy setting is
// configured.
func (i RawItem) Origin() *Origin {
return i.origin
return i.data.Origin
}
// String implements [fmt.Stringer].
func (i RawItem) String() string {
var suffix string
if i.origin != nil {
suffix = fmt.Sprintf(" - {%v}", i.origin)
if i.data.Origin != nil {
suffix = fmt.Sprintf(" - {%v}", i.data.Origin)
}
if i.err != nil {
return fmt.Sprintf("Error{%q}%s", i.err.Error(), suffix)
if i.data.Error != nil {
return fmt.Sprintf("Error{%q}%s", i.data.Error.Error(), suffix)
}
return fmt.Sprintf("%v%s", i.value, suffix)
return fmt.Sprintf("%v%s", i.data.Value.Value, suffix)
}
// MarshalJSONV2 implements [jsonv2.MarshalerV2].
func (i RawItem) MarshalJSONV2(out *jsontext.Encoder, opts jsonv2.Options) error {
return jsonv2.MarshalEncode(out, &i.data, opts)
}
// UnmarshalJSONV2 implements [jsonv2.UnmarshalerV2].
func (i *RawItem) UnmarshalJSONV2(in *jsontext.Decoder, opts jsonv2.Options) error {
return jsonv2.UnmarshalDecode(in, &i.data, opts)
}
// MarshalJSON implements [json.Marshaler].
func (i RawItem) MarshalJSON() ([]byte, error) {
return jsonv2.Marshal(i) // uses MarshalJSONV2
}
// UnmarshalJSON implements [json.Unmarshaler].
func (i *RawItem) UnmarshalJSON(b []byte) error {
return jsonv2.Unmarshal(b, i) // uses UnmarshalJSONV2
}
// RawValue represents a raw policy setting value read from a policy store.
// It is JSON-marshallable and facilitates unmarshalling of JSON values
// into corresponding policy setting types, with special handling for JSON numbers
// (unmarshalled as float64) and JSON string arrays (unmarshalled as []string).
// See also [RawValue.UnmarshalJSONV2].
type RawValue struct {
opt.Value[any]
}
// RawValueType is a constraint that permits raw setting value types.
type RawValueType interface {
bool | uint64 | string | []string
}
// RawValueOf returns a new [RawValue] holding the specified value.
func RawValueOf[T RawValueType](v T) RawValue {
return RawValue{opt.ValueOf[any](v)}
}
// MarshalJSONV2 implements [jsonv2.MarshalerV2].
func (v RawValue) MarshalJSONV2(out *jsontext.Encoder, opts jsonv2.Options) error {
return jsonv2.MarshalEncode(out, v.Value, opts)
}
// UnmarshalJSONV2 implements [jsonv2.UnmarshalerV2] by attempting to unmarshal
// a JSON value as one of the supported policy setting value types (bool, string, uint64, or []string),
// based on the JSON value type. It fails if the JSON value is an object, if it's a JSON number that
// cannot be represented as a uint64, or if a JSON array contains anything other than strings.
func (v *RawValue) UnmarshalJSONV2(in *jsontext.Decoder, opts jsonv2.Options) error {
var valPtr any
switch k := in.PeekKind(); k {
case 't', 'f':
valPtr = new(bool)
case '"':
valPtr = new(string)
case '0':
valPtr = new(uint64) // unmarshal JSON numbers as uint64
case '[', 'n':
valPtr = new([]string) // unmarshal arrays as string slices
case '{':
return fmt.Errorf("unexpected token: %v", k)
default:
panic("unreachable")
}
if err := jsonv2.UnmarshalDecode(in, valPtr, opts); err != nil {
v.Value.Clear()
return err
}
value := reflect.ValueOf(valPtr).Elem().Interface()
v.Value = opt.ValueOf(value)
return nil
}
// MarshalJSON implements [json.Marshaler].
func (v RawValue) MarshalJSON() ([]byte, error) {
return jsonv2.Marshal(v) // uses MarshalJSONV2
}
// UnmarshalJSON implements [json.Unmarshaler].
func (v *RawValue) UnmarshalJSON(b []byte) error {
return jsonv2.Unmarshal(b, v) // uses UnmarshalJSONV2
}
// RawValues is a map of keyed setting values that can be read from a JSON.
type RawValues map[Key]RawValue

101
util/syspolicy/setting/raw_item_test.go Normal file
View File

@ -0,0 +1,101 @@
// Copyright (c) Tailscale Inc & AUTHORS
// SPDX-License-Identifier: BSD-3-Clause
package setting
import (
"math"
"reflect"
"strconv"
"testing"
jsonv2 "github.com/go-json-experiment/json"
)
func TestMarshalUnmarshalRawValue(t *testing.T) {
tests := []struct {
name string
json string
want RawValue
wantErr bool
}{
{
name: "Bool/True",
json: `true`,
want: RawValueOf(true),
},
{
name: "Bool/False",
json: `false`,
want: RawValueOf(false),
},
{
name: "String/Empty",
json: `""`,
want: RawValueOf(""),
},
{
name: "String/NonEmpty",
json: `"Test"`,
want: RawValueOf("Test"),
},
{
name: "StringSlice/Null",
json: `null`,
want: RawValueOf([]string(nil)),
},
{
name: "StringSlice/Empty",
json: `[]`,
want: RawValueOf([]string{}),
},
{
name: "StringSlice/NonEmpty",
json: `["A", "B", "C"]`,
want: RawValueOf([]string{"A", "B", "C"}),
},
{
name: "StringSlice/NonStrings",
json: `[1, 2, 3]`,
wantErr: true,
},
{
name: "Number/Integer/0",
json: `0`,
want: RawValueOf(uint64(0)),
},
{
name: "Number/Integer/1",
json: `1`,
want: RawValueOf(uint64(1)),
},
{
name: "Number/Integer/MaxUInt64",
json: strconv.FormatUint(math.MaxUint64, 10),
want: RawValueOf(uint64(math.MaxUint64)),
},
{
name: "Number/Integer/Negative",
json: `-1`,
wantErr: true,
},
{
name: "Object",
json: `{}`,
wantErr: true,
},
}
for _, tt := range tests {
t.Run(tt.name, func(t *testing.T) {
var got RawValue
gotErr := jsonv2.Unmarshal([]byte(tt.json), &got)
if (gotErr != nil) != tt.wantErr {
t.Fatalf("Error: got %v; want %v", gotErr, tt.wantErr)
}
if !tt.wantErr && !reflect.DeepEqual(got, tt.want) {
t.Fatalf("Value: got %v; want %v", got, tt.want)
}
})
}
}

251
util/syspolicy/setting/snapshot_test.go
View File

@ -30,134 +30,134 @@ func TestMergeSnapshots(t *testing.T) {
name: "first-nil",
s1: nil,
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
},
{
name: "first-empty",
s1: NewSnapshot(map[Key]RawItem{}),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
},
{
name: "second-nil",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
s2: nil,
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
},
{
name: "second-empty",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
s2: NewSnapshot(map[Key]RawItem{}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
},
{
name: "no-conflicts",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
s2: NewSnapshot(map[Key]RawItem{
"Setting4": {value: 2 * time.Hour},
"Setting5": {value: VisibleByPolicy},
"Setting6": {value: ShowChoiceByPolicy},
"Setting4": RawItemOf(2 * time.Hour),
"Setting5": RawItemOf(VisibleByPolicy),
"Setting6": RawItemOf(ShowChoiceByPolicy),
}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting5": {value: VisibleByPolicy},
"Setting6": {value: ShowChoiceByPolicy},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
"Setting5": RawItemOf(VisibleByPolicy),
"Setting6": RawItemOf(ShowChoiceByPolicy),
}),
},
{
name: "with-conflicts",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 456},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(456),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 456},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(456),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
}),
},
{
name: "with-scope-first-wins",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}, DeviceScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 456},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(456),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
}, CurrentUserScope),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
"Setting4": RawItemOf(2 * time.Hour),
}, CurrentUserScope),
},
{
name: "with-scope-second-wins",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}, CurrentUserScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 456},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(456),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
}, DeviceScope),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 456},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting4": {value: 2 * time.Hour},
"Setting1": RawItemOf(456),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
"Setting4": RawItemOf(2 * time.Hour),
}, CurrentUserScope),
},
{
@ -170,28 +170,27 @@ func TestMergeSnapshots(t *testing.T) {
name: "with-scope-first-empty",
s1: NewSnapshot(map[Key]RawItem{}, CurrentUserScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true}},
DeviceScope, NewNamedOrigin("TestPolicy", DeviceScope)),
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true)}, DeviceScope, NewNamedOrigin("TestPolicy", DeviceScope)),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}, CurrentUserScope, NewNamedOrigin("TestPolicy", DeviceScope)),
},
{
name: "with-scope-second-empty",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}, CurrentUserScope),
s2: NewSnapshot(map[Key]RawItem{}),
want: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}, CurrentUserScope),
},
}
@ -244,9 +243,9 @@ func TestSnapshotEqual(t *testing.T) {
name: "first-nil",
s1: nil,
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
wantEqual: false,
wantEqualItems: false,
@ -255,9 +254,9 @@ func TestSnapshotEqual(t *testing.T) {
name: "first-empty",
s1: NewSnapshot(map[Key]RawItem{}),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
wantEqual: false,
wantEqualItems: false,
@ -265,9 +264,9 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "second-nil",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: true},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(true),
}),
s2: nil,
wantEqual: false,
@ -276,9 +275,9 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "second-empty",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
s2: NewSnapshot(map[Key]RawItem{}),
wantEqual: false,
@ -287,14 +286,14 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "same-items-same-order-no-scope",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}),
wantEqual: true,
wantEqualItems: true,
@ -302,14 +301,14 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "same-items-same-order-same-scope",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, DeviceScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, DeviceScope),
wantEqual: true,
wantEqualItems: true,
@ -317,14 +316,14 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "same-items-different-order-same-scope",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, DeviceScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting3": {value: false},
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": RawItemOf(false),
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
}, DeviceScope),
wantEqual: true,
wantEqualItems: true,
@ -332,14 +331,14 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "same-items-same-order-different-scope",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, DeviceScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, CurrentUserScope),
wantEqual: false,
wantEqualItems: true,
@ -347,14 +346,14 @@ func TestSnapshotEqual(t *testing.T) {
{
name: "different-items-same-scope",
s1: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 123},
"Setting2": {value: "String"},
"Setting3": {value: false},
"Setting1": RawItemOf(123),
"Setting2": RawItemOf("String"),
"Setting3": RawItemOf(false),
}, DeviceScope),
s2: NewSnapshot(map[Key]RawItem{
"Setting4": {value: 2 * time.Hour},
"Setting5": {value: VisibleByPolicy},
"Setting6": {value: ShowChoiceByPolicy},
"Setting4": RawItemOf(2 * time.Hour),
"Setting5": RawItemOf(VisibleByPolicy),
"Setting6": RawItemOf(ShowChoiceByPolicy),
}, DeviceScope),
wantEqual: false,
wantEqualItems: false,
@ -401,9 +400,9 @@ func TestSnapshotString(t *testing.T) {
{
name: "non-empty",
snapshot: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 2 * time.Hour},
"Setting2": {value: VisibleByPolicy},
"Setting3": {value: ShowChoiceByPolicy},
"Setting1": RawItemOf(2 * time.Hour),
"Setting2": RawItemOf(VisibleByPolicy),
"Setting3": RawItemOf(ShowChoiceByPolicy),
}, NewNamedOrigin("Test Policy", DeviceScope)),
wantString: `{Test Policy (Device)}
Setting1 = 2h0m0s
@ -413,14 +412,14 @@ func TestSnapshotString(t *testing.T) {
{
name: "non-empty-with-item-origin",
snapshot: NewSnapshot(map[Key]RawItem{
"Setting1": {value: 42, origin: NewNamedOrigin("Test Policy", DeviceScope)},
"Setting1": RawItemWith(42, nil, NewNamedOrigin("Test Policy", DeviceScope)),
}),
wantString: `Setting1 = 42 - {Test Policy (Device)}`,
},
{
name: "non-empty-with-item-error",
snapshot: NewSnapshot(map[Key]RawItem{
"Setting1": {err: NewErrorText("bang!")},
"Setting1": RawItemWith(nil, NewErrorText("bang!"), nil),
}),
wantString: `Setting1 = Error{"bang!"}`,
},