panic when an extension request is issued before an extension has been initialized. but give a nice error message for the happy people.

1 files changed, 123 insertions, 3 deletions

diff --git a/nexgb/sync/sync.go b/nexgb/sync/sync.go
index 1904963..5aa019e 100644
--- a/nexgb/sync/sync.go
+++ b/nexgb/sync/sync.go
@@ -2,7 +2,7 @@
 package sync
 
 /*
-	This file was generated by sync.xml on May 11 2012 1:58:36am EDT.
+	This file was generated by sync.xml on May 11 2012 11:57:19pm EDT.
 	This file is automatically generated. Edit at your peril!
 */
 
@@ -40,6 +40,8 @@ func init() {
 	xgb.NewExtErrorFuncs["SYNC"] = make(map[int]xgb.NewErrorFun)
 }
 
+// Skipping definition for base type 'Float'
+
 // Skipping definition for base type 'Card8'
 
 // Skipping definition for base type 'Int16'
@@ -62,8 +64,6 @@ func init() {
 
 // Skipping definition for base type 'Bool'
 
-// Skipping definition for base type 'Float'
-
 const (
 	AlarmstateActive    = 0
 	AlarmstateInactive  = 1
@@ -750,6 +750,9 @@ type InitializeCookie struct {
 // Initialize sends a checked request.
 // If an error occurs, it will be returned with the reply by calling InitializeCookie.Reply()
 func Initialize(c *xgb.Conn, DesiredMajorVersion byte, DesiredMinorVersion byte) InitializeCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'Initialize' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(initializeRequest(c, DesiredMajorVersion, DesiredMinorVersion), cookie)
 	return InitializeCookie{cookie}
@@ -758,6 +761,9 @@ func Initialize(c *xgb.Conn, DesiredMajorVersion byte, DesiredMinorVersion byte)
 // InitializeUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func InitializeUnchecked(c *xgb.Conn, DesiredMajorVersion byte, DesiredMinorVersion byte) InitializeCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'Initialize' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(initializeRequest(c, DesiredMajorVersion, DesiredMinorVersion), cookie)
 	return InitializeCookie{cookie}
@@ -842,6 +848,9 @@ type ListSystemCountersCookie struct {
 // ListSystemCounters sends a checked request.
 // If an error occurs, it will be returned with the reply by calling ListSystemCountersCookie.Reply()
 func ListSystemCounters(c *xgb.Conn) ListSystemCountersCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ListSystemCounters' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(listSystemCountersRequest(c), cookie)
 	return ListSystemCountersCookie{cookie}
@@ -850,6 +859,9 @@ func ListSystemCounters(c *xgb.Conn) ListSystemCountersCookie {
 // ListSystemCountersUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ListSystemCountersUnchecked(c *xgb.Conn) ListSystemCountersCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ListSystemCounters' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(listSystemCountersRequest(c), cookie)
 	return ListSystemCountersCookie{cookie}
@@ -928,6 +940,9 @@ type CreateCounterCookie struct {
 // CreateCounter sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateCounter(c *xgb.Conn, Id Counter, InitialValue Int64) CreateCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createCounterRequest(c, Id, InitialValue), cookie)
 	return CreateCounterCookie{cookie}
@@ -936,6 +951,9 @@ func CreateCounter(c *xgb.Conn, Id Counter, InitialValue Int64) CreateCounterCoo
 // CreateCounterChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateCounterCookie.Check()
 func CreateCounterChecked(c *xgb.Conn, Id Counter, InitialValue Int64) CreateCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createCounterRequest(c, Id, InitialValue), cookie)
 	return CreateCounterCookie{cookie}
@@ -983,6 +1001,9 @@ type DestroyCounterCookie struct {
 // DestroyCounter sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func DestroyCounter(c *xgb.Conn, Counter Counter) DestroyCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(destroyCounterRequest(c, Counter), cookie)
 	return DestroyCounterCookie{cookie}
@@ -991,6 +1012,9 @@ func DestroyCounter(c *xgb.Conn, Counter Counter) DestroyCounterCookie {
 // DestroyCounterChecked sends a checked request.
 // If an error occurs, it can be retrieved using DestroyCounterCookie.Check()
 func DestroyCounterChecked(c *xgb.Conn, Counter Counter) DestroyCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(destroyCounterRequest(c, Counter), cookie)
 	return DestroyCounterCookie{cookie}
@@ -1032,6 +1056,9 @@ type QueryCounterCookie struct {
 // QueryCounter sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryCounterCookie.Reply()
 func QueryCounter(c *xgb.Conn, Counter Counter) QueryCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryCounterRequest(c, Counter), cookie)
 	return QueryCounterCookie{cookie}
@@ -1040,6 +1067,9 @@ func QueryCounter(c *xgb.Conn, Counter Counter) QueryCounterCookie {
 // QueryCounterUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryCounterUnchecked(c *xgb.Conn, Counter Counter) QueryCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryCounterRequest(c, Counter), cookie)
 	return QueryCounterCookie{cookie}
@@ -1114,6 +1144,9 @@ type AwaitCookie struct {
 // Await sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func Await(c *xgb.Conn, WaitList []Waitcondition) AwaitCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'Await' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(awaitRequest(c, WaitList), cookie)
 	return AwaitCookie{cookie}
@@ -1122,6 +1155,9 @@ func Await(c *xgb.Conn, WaitList []Waitcondition) AwaitCookie {
 // AwaitChecked sends a checked request.
 // If an error occurs, it can be retrieved using AwaitCookie.Check()
 func AwaitChecked(c *xgb.Conn, WaitList []Waitcondition) AwaitCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'Await' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(awaitRequest(c, WaitList), cookie)
 	return AwaitCookie{cookie}
@@ -1162,6 +1198,9 @@ type ChangeCounterCookie struct {
 // ChangeCounter sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ChangeCounter(c *xgb.Conn, Counter Counter, Amount Int64) ChangeCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ChangeCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(changeCounterRequest(c, Counter, Amount), cookie)
 	return ChangeCounterCookie{cookie}
@@ -1170,6 +1209,9 @@ func ChangeCounter(c *xgb.Conn, Counter Counter, Amount Int64) ChangeCounterCook
 // ChangeCounterChecked sends a checked request.
 // If an error occurs, it can be retrieved using ChangeCounterCookie.Check()
 func ChangeCounterChecked(c *xgb.Conn, Counter Counter, Amount Int64) ChangeCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ChangeCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(changeCounterRequest(c, Counter, Amount), cookie)
 	return ChangeCounterCookie{cookie}
@@ -1217,6 +1259,9 @@ type SetCounterCookie struct {
 // SetCounter sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func SetCounter(c *xgb.Conn, Counter Counter, Value Int64) SetCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'SetCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(setCounterRequest(c, Counter, Value), cookie)
 	return SetCounterCookie{cookie}
@@ -1225,6 +1270,9 @@ func SetCounter(c *xgb.Conn, Counter Counter, Value Int64) SetCounterCookie {
 // SetCounterChecked sends a checked request.
 // If an error occurs, it can be retrieved using SetCounterCookie.Check()
 func SetCounterChecked(c *xgb.Conn, Counter Counter, Value Int64) SetCounterCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'SetCounter' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(setCounterRequest(c, Counter, Value), cookie)
 	return SetCounterCookie{cookie}
@@ -1272,6 +1320,9 @@ type CreateAlarmCookie struct {
 // CreateAlarm sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateAlarm(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) CreateAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createAlarmRequest(c, Id, ValueMask, ValueList), cookie)
 	return CreateAlarmCookie{cookie}
@@ -1280,6 +1331,9 @@ func CreateAlarm(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) Cr
 // CreateAlarmChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateAlarmCookie.Check()
 func CreateAlarmChecked(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) CreateAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createAlarmRequest(c, Id, ValueMask, ValueList), cookie)
 	return CreateAlarmCookie{cookie}
@@ -1329,6 +1383,9 @@ type ChangeAlarmCookie struct {
 // ChangeAlarm sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ChangeAlarm(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) ChangeAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ChangeAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(changeAlarmRequest(c, Id, ValueMask, ValueList), cookie)
 	return ChangeAlarmCookie{cookie}
@@ -1337,6 +1394,9 @@ func ChangeAlarm(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) Ch
 // ChangeAlarmChecked sends a checked request.
 // If an error occurs, it can be retrieved using ChangeAlarmCookie.Check()
 func ChangeAlarmChecked(c *xgb.Conn, Id Alarm, ValueMask uint32, ValueList []uint32) ChangeAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ChangeAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(changeAlarmRequest(c, Id, ValueMask, ValueList), cookie)
 	return ChangeAlarmCookie{cookie}
@@ -1386,6 +1446,9 @@ type DestroyAlarmCookie struct {
 // DestroyAlarm sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func DestroyAlarm(c *xgb.Conn, Alarm Alarm) DestroyAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(destroyAlarmRequest(c, Alarm), cookie)
 	return DestroyAlarmCookie{cookie}
@@ -1394,6 +1457,9 @@ func DestroyAlarm(c *xgb.Conn, Alarm Alarm) DestroyAlarmCookie {
 // DestroyAlarmChecked sends a checked request.
 // If an error occurs, it can be retrieved using DestroyAlarmCookie.Check()
 func DestroyAlarmChecked(c *xgb.Conn, Alarm Alarm) DestroyAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(destroyAlarmRequest(c, Alarm), cookie)
 	return DestroyAlarmCookie{cookie}
@@ -1435,6 +1501,9 @@ type QueryAlarmCookie struct {
 // QueryAlarm sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryAlarmCookie.Reply()
 func QueryAlarm(c *xgb.Conn, Alarm Alarm) QueryAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryAlarmRequest(c, Alarm), cookie)
 	return QueryAlarmCookie{cookie}
@@ -1443,6 +1512,9 @@ func QueryAlarm(c *xgb.Conn, Alarm Alarm) QueryAlarmCookie {
 // QueryAlarmUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryAlarmUnchecked(c *xgb.Conn, Alarm Alarm) QueryAlarmCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryAlarm' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryAlarmRequest(c, Alarm), cookie)
 	return QueryAlarmCookie{cookie}
@@ -1536,6 +1608,9 @@ type SetPriorityCookie struct {
 // SetPriority sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func SetPriority(c *xgb.Conn, Id uint32, Priority int32) SetPriorityCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'SetPriority' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(setPriorityRequest(c, Id, Priority), cookie)
 	return SetPriorityCookie{cookie}
@@ -1544,6 +1619,9 @@ func SetPriority(c *xgb.Conn, Id uint32, Priority int32) SetPriorityCookie {
 // SetPriorityChecked sends a checked request.
 // If an error occurs, it can be retrieved using SetPriorityCookie.Check()
 func SetPriorityChecked(c *xgb.Conn, Id uint32, Priority int32) SetPriorityCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'SetPriority' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(setPriorityRequest(c, Id, Priority), cookie)
 	return SetPriorityCookie{cookie}
@@ -1588,6 +1666,9 @@ type GetPriorityCookie struct {
 // GetPriority sends a checked request.
 // If an error occurs, it will be returned with the reply by calling GetPriorityCookie.Reply()
 func GetPriority(c *xgb.Conn, Id uint32) GetPriorityCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'GetPriority' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(getPriorityRequest(c, Id), cookie)
 	return GetPriorityCookie{cookie}
@@ -1596,6 +1677,9 @@ func GetPriority(c *xgb.Conn, Id uint32) GetPriorityCookie {
 // GetPriorityUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func GetPriorityUnchecked(c *xgb.Conn, Id uint32) GetPriorityCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'GetPriority' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(getPriorityRequest(c, Id), cookie)
 	return GetPriorityCookie{cookie}
@@ -1670,6 +1754,9 @@ type CreateFenceCookie struct {
 // CreateFence sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateFence(c *xgb.Conn, Drawable xproto.Drawable, Fence Fence, InitiallyTriggered bool) CreateFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createFenceRequest(c, Drawable, Fence, InitiallyTriggered), cookie)
 	return CreateFenceCookie{cookie}
@@ -1678,6 +1765,9 @@ func CreateFence(c *xgb.Conn, Drawable xproto.Drawable, Fence Fence, InitiallyTr
 // CreateFenceChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateFenceCookie.Check()
 func CreateFenceChecked(c *xgb.Conn, Drawable xproto.Drawable, Fence Fence, InitiallyTriggered bool) CreateFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'CreateFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createFenceRequest(c, Drawable, Fence, InitiallyTriggered), cookie)
 	return CreateFenceCookie{cookie}
@@ -1729,6 +1819,9 @@ type TriggerFenceCookie struct {
 // TriggerFence sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func TriggerFence(c *xgb.Conn, Fence Fence) TriggerFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'TriggerFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(triggerFenceRequest(c, Fence), cookie)
 	return TriggerFenceCookie{cookie}
@@ -1737,6 +1830,9 @@ func TriggerFence(c *xgb.Conn, Fence Fence) TriggerFenceCookie {
 // TriggerFenceChecked sends a checked request.
 // If an error occurs, it can be retrieved using TriggerFenceCookie.Check()
 func TriggerFenceChecked(c *xgb.Conn, Fence Fence) TriggerFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'TriggerFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(triggerFenceRequest(c, Fence), cookie)
 	return TriggerFenceCookie{cookie}
@@ -1778,6 +1874,9 @@ type ResetFenceCookie struct {
 // ResetFence sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func ResetFence(c *xgb.Conn, Fence Fence) ResetFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ResetFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(resetFenceRequest(c, Fence), cookie)
 	return ResetFenceCookie{cookie}
@@ -1786,6 +1885,9 @@ func ResetFence(c *xgb.Conn, Fence Fence) ResetFenceCookie {
 // ResetFenceChecked sends a checked request.
 // If an error occurs, it can be retrieved using ResetFenceCookie.Check()
 func ResetFenceChecked(c *xgb.Conn, Fence Fence) ResetFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'ResetFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(resetFenceRequest(c, Fence), cookie)
 	return ResetFenceCookie{cookie}
@@ -1827,6 +1929,9 @@ type DestroyFenceCookie struct {
 // DestroyFence sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func DestroyFence(c *xgb.Conn, Fence Fence) DestroyFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(destroyFenceRequest(c, Fence), cookie)
 	return DestroyFenceCookie{cookie}
@@ -1835,6 +1940,9 @@ func DestroyFence(c *xgb.Conn, Fence Fence) DestroyFenceCookie {
 // DestroyFenceChecked sends a checked request.
 // If an error occurs, it can be retrieved using DestroyFenceCookie.Check()
 func DestroyFenceChecked(c *xgb.Conn, Fence Fence) DestroyFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'DestroyFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(destroyFenceRequest(c, Fence), cookie)
 	return DestroyFenceCookie{cookie}
@@ -1876,6 +1984,9 @@ type QueryFenceCookie struct {
 // QueryFence sends a checked request.
 // If an error occurs, it will be returned with the reply by calling QueryFenceCookie.Reply()
 func QueryFence(c *xgb.Conn, Fence Fence) QueryFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(queryFenceRequest(c, Fence), cookie)
 	return QueryFenceCookie{cookie}
@@ -1884,6 +1995,9 @@ func QueryFence(c *xgb.Conn, Fence Fence) QueryFenceCookie {
 // QueryFenceUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func QueryFenceUnchecked(c *xgb.Conn, Fence Fence) QueryFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'QueryFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(queryFenceRequest(c, Fence), cookie)
 	return QueryFenceCookie{cookie}
@@ -1965,6 +2079,9 @@ type AwaitFenceCookie struct {
 // AwaitFence sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func AwaitFence(c *xgb.Conn, FenceList []Fence) AwaitFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'AwaitFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(awaitFenceRequest(c, FenceList), cookie)
 	return AwaitFenceCookie{cookie}
@@ -1973,6 +2090,9 @@ func AwaitFence(c *xgb.Conn, FenceList []Fence) AwaitFenceCookie {
 // AwaitFenceChecked sends a checked request.
 // If an error occurs, it can be retrieved using AwaitFenceCookie.Check()
 func AwaitFenceChecked(c *xgb.Conn, FenceList []Fence) AwaitFenceCookie {
+	if _, ok := c.Extensions["SYNC"]; !ok {
+		panic("Cannot issue request 'AwaitFence' using the uninitialized extension 'SYNC'. sync.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(awaitFenceRequest(c, FenceList), cookie)
 	return AwaitFenceCookie{cookie}