diff --git a/tailcfg/tailcfg.go b/tailcfg/tailcfg.go
index 30f5988d1..a1d6a08a2 100644
--- a/tailcfg/tailcfg.go
+++ b/tailcfg/tailcfg.go
@@ -4,7 +4,7 @@
 
 package tailcfg
 
-//go:generate go run tailscale.com/cmd/cloner -type=User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig -output=tailcfg_clone.go
+//go:generate go run tailscale.com/cmd/cloner -type=User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse -output=tailcfg_clone.go
 
 import (
 	"bytes"
diff --git a/tailcfg/tailcfg_clone.go b/tailcfg/tailcfg_clone.go
index c112888ec..8389cab45 100644
--- a/tailcfg/tailcfg_clone.go
+++ b/tailcfg/tailcfg_clone.go
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style
 // license that can be found in the LICENSE file.
 
-// Code generated by tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig; DO NOT EDIT.
+// Code generated by tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse; DO NOT EDIT.
 
 package tailcfg
 
@@ -28,7 +28,7 @@ func (src *User) Clone() *User {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _UserNeedsRegeneration = User(struct {
 	ID            UserID
 	LoginName     string
@@ -60,7 +60,7 @@ func (src *Node) Clone() *Node {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _NodeNeedsRegeneration = Node(struct {
 	ID                NodeID
 	Name              string
@@ -96,7 +96,7 @@ func (src *Hostinfo) Clone() *Hostinfo {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _HostinfoNeedsRegeneration = Hostinfo(struct {
 	IPNVersion    string
 	FrontendLogID string
@@ -130,7 +130,7 @@ func (src *NetInfo) Clone() *NetInfo {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _NetInfoNeedsRegeneration = NetInfo(struct {
 	MappingVariesByDestIP opt.Bool
 	HairPinning           opt.Bool
@@ -157,7 +157,7 @@ func (src *Group) Clone() *Group {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _GroupNeedsRegeneration = Group(struct {
 	ID      GroupID
 	Name    string
@@ -177,7 +177,7 @@ func (src *Role) Clone() *Role {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _RoleNeedsRegeneration = Role(struct {
 	ID           RoleID
 	Name         string
@@ -196,7 +196,7 @@ func (src *Capability) Clone() *Capability {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _CapabilityNeedsRegeneration = Capability(struct {
 	ID   CapabilityID
 	Type CapType
@@ -215,7 +215,7 @@ func (src *Login) Clone() *Login {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _LoginNeedsRegeneration = Login(struct {
 	_             structs.Incomparable
 	ID            LoginID
@@ -240,7 +240,7 @@ func (src *DNSConfig) Clone() *DNSConfig {
 }
 
 // A compilation failure here means this code must be regenerated, with command:
-//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
 var _DNSConfigNeedsRegeneration = DNSConfig(struct {
 	Nameservers []netaddr.IP
 	Domains     []string
@@ -248,9 +248,31 @@ var _DNSConfigNeedsRegeneration = DNSConfig(struct {
 	Proxied     bool
 }{})
 
+// Clone makes a deep copy of RegisterResponse.
+// The result aliases no memory with the original.
+func (src *RegisterResponse) Clone() *RegisterResponse {
+	if src == nil {
+		return nil
+	}
+	dst := new(RegisterResponse)
+	*dst = *src
+	dst.User = *src.User.Clone()
+	return dst
+}
+
+// A compilation failure here means this code must be regenerated, with command:
+//   tailscale.com/cmd/cloner -type User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse
+var _RegisterResponseNeedsRegeneration = RegisterResponse(struct {
+	User              User
+	Login             Login
+	NodeKeyExpired    bool
+	MachineAuthorized bool
+	AuthURL           string
+}{})
+
 // Clone duplicates src into dst and reports whether it succeeded.
 // To succeed, <src, dst> must be of types <*T, *T> or <*T, **T>,
-// where T is one of User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig.
+// where T is one of User,Node,Hostinfo,NetInfo,Group,Role,Capability,Login,DNSConfig,RegisterResponse.
 func Clone(dst, src interface{}) bool {
 	switch src := src.(type) {
 	case *User:
@@ -334,6 +356,15 @@ func Clone(dst, src interface{}) bool {
 			*dst = src.Clone()
 			return true
 		}
+	case *RegisterResponse:
+		switch dst := dst.(type) {
+		case *RegisterResponse:
+			*dst = *src.Clone()
+			return true
+		case **RegisterResponse:
+			*dst = src.Clone()
+			return true
+		}
 	}
 	return false
 }