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, 161 insertions, 11 deletions

diff --git a/nexgb/xprint/xprint.go b/nexgb/xprint/xprint.go
index 9f4bd6b..8e6f470 100644
--- a/nexgb/xprint/xprint.go
+++ b/nexgb/xprint/xprint.go
@@ -2,7 +2,7 @@
 package xprint
 
 /*
-	This file was generated by xprint.xml on May 11 2012 1:58:37am EDT.
+	This file was generated by xprint.xml on May 11 2012 11:57:20pm EDT.
 	This file is automatically generated. Edit at your peril!
 */
 
@@ -40,6 +40,16 @@ func init() {
 	xgb.NewExtErrorFuncs["XpExtension"] = make(map[int]xgb.NewErrorFun)
 }
 
+// Skipping definition for base type 'Char'
+
+// Skipping definition for base type 'Card32'
+
+// Skipping definition for base type 'Double'
+
+// Skipping definition for base type 'Bool'
+
+// Skipping definition for base type 'Float'
+
 // Skipping definition for base type 'Card8'
 
 // Skipping definition for base type 'Int16'
@@ -54,16 +64,6 @@ func init() {
 
 // Skipping definition for base type 'Card16'
 
-// Skipping definition for base type 'Char'
-
-// Skipping definition for base type 'Card32'
-
-// Skipping definition for base type 'Double'
-
-// Skipping definition for base type 'Bool'
-
-// Skipping definition for base type 'Float'
-
 const (
 	GetDocFinished       = 0
 	GetDocSecondConsumer = 1
@@ -445,6 +445,9 @@ type PrintQueryVersionCookie struct {
 // PrintQueryVersion sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintQueryVersionCookie.Reply()
 func PrintQueryVersion(c *xgb.Conn) PrintQueryVersionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintQueryVersion' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printQueryVersionRequest(c), cookie)
 	return PrintQueryVersionCookie{cookie}
@@ -453,6 +456,9 @@ func PrintQueryVersion(c *xgb.Conn) PrintQueryVersionCookie {
 // PrintQueryVersionUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintQueryVersionUnchecked(c *xgb.Conn) PrintQueryVersionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintQueryVersion' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printQueryVersionRequest(c), cookie)
 	return PrintQueryVersionCookie{cookie}
@@ -528,6 +534,9 @@ type PrintGetPrinterListCookie struct {
 // PrintGetPrinterList sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetPrinterListCookie.Reply()
 func PrintGetPrinterList(c *xgb.Conn, PrinterNameLen uint32, LocaleLen uint32, PrinterName []String8, Locale []String8) PrintGetPrinterListCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetPrinterList' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetPrinterListRequest(c, PrinterNameLen, LocaleLen, PrinterName, Locale), cookie)
 	return PrintGetPrinterListCookie{cookie}
@@ -536,6 +545,9 @@ func PrintGetPrinterList(c *xgb.Conn, PrinterNameLen uint32, LocaleLen uint32, P
 // PrintGetPrinterListUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetPrinterListUnchecked(c *xgb.Conn, PrinterNameLen uint32, LocaleLen uint32, PrinterName []String8, Locale []String8) PrintGetPrinterListCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetPrinterList' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetPrinterListRequest(c, PrinterNameLen, LocaleLen, PrinterName, Locale), cookie)
 	return PrintGetPrinterListCookie{cookie}
@@ -632,6 +644,9 @@ type PrintRehashPrinterListCookie struct {
 // PrintRehashPrinterList sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintRehashPrinterList(c *xgb.Conn) PrintRehashPrinterListCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintRehashPrinterList' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printRehashPrinterListRequest(c), cookie)
 	return PrintRehashPrinterListCookie{cookie}
@@ -640,6 +655,9 @@ func PrintRehashPrinterList(c *xgb.Conn) PrintRehashPrinterListCookie {
 // PrintRehashPrinterListChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintRehashPrinterListCookie.Check()
 func PrintRehashPrinterListChecked(c *xgb.Conn) PrintRehashPrinterListCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintRehashPrinterList' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printRehashPrinterListRequest(c), cookie)
 	return PrintRehashPrinterListCookie{cookie}
@@ -678,6 +696,9 @@ type CreateContextCookie struct {
 // CreateContext sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func CreateContext(c *xgb.Conn, ContextId uint32, PrinterNameLen uint32, LocaleLen uint32, PrinterName []String8, Locale []String8) CreateContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'CreateContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(createContextRequest(c, ContextId, PrinterNameLen, LocaleLen, PrinterName, Locale), cookie)
 	return CreateContextCookie{cookie}
@@ -686,6 +707,9 @@ func CreateContext(c *xgb.Conn, ContextId uint32, PrinterNameLen uint32, LocaleL
 // CreateContextChecked sends a checked request.
 // If an error occurs, it can be retrieved using CreateContextCookie.Check()
 func CreateContextChecked(c *xgb.Conn, ContextId uint32, PrinterNameLen uint32, LocaleLen uint32, PrinterName []String8, Locale []String8) CreateContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'CreateContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(createContextRequest(c, ContextId, PrinterNameLen, LocaleLen, PrinterName, Locale), cookie)
 	return CreateContextCookie{cookie}
@@ -745,6 +769,9 @@ type PrintSetContextCookie struct {
 // PrintSetContext sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintSetContext(c *xgb.Conn, Context uint32) PrintSetContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printSetContextRequest(c, Context), cookie)
 	return PrintSetContextCookie{cookie}
@@ -753,6 +780,9 @@ func PrintSetContext(c *xgb.Conn, Context uint32) PrintSetContextCookie {
 // PrintSetContextChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintSetContextCookie.Check()
 func PrintSetContextChecked(c *xgb.Conn, Context uint32) PrintSetContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printSetContextRequest(c, Context), cookie)
 	return PrintSetContextCookie{cookie}
@@ -794,6 +824,9 @@ type PrintGetContextCookie struct {
 // PrintGetContext sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetContextCookie.Reply()
 func PrintGetContext(c *xgb.Conn) PrintGetContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetContextRequest(c), cookie)
 	return PrintGetContextCookie{cookie}
@@ -802,6 +835,9 @@ func PrintGetContext(c *xgb.Conn) PrintGetContextCookie {
 // PrintGetContextUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetContextUnchecked(c *xgb.Conn) PrintGetContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetContextRequest(c), cookie)
 	return PrintGetContextCookie{cookie}
@@ -873,6 +909,9 @@ type PrintDestroyContextCookie struct {
 // PrintDestroyContext sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintDestroyContext(c *xgb.Conn, Context uint32) PrintDestroyContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintDestroyContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printDestroyContextRequest(c, Context), cookie)
 	return PrintDestroyContextCookie{cookie}
@@ -881,6 +920,9 @@ func PrintDestroyContext(c *xgb.Conn, Context uint32) PrintDestroyContextCookie
 // PrintDestroyContextChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintDestroyContextCookie.Check()
 func PrintDestroyContextChecked(c *xgb.Conn, Context uint32) PrintDestroyContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintDestroyContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printDestroyContextRequest(c, Context), cookie)
 	return PrintDestroyContextCookie{cookie}
@@ -922,6 +964,9 @@ type PrintGetScreenOfContextCookie struct {
 // PrintGetScreenOfContext sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetScreenOfContextCookie.Reply()
 func PrintGetScreenOfContext(c *xgb.Conn) PrintGetScreenOfContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetScreenOfContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetScreenOfContextRequest(c), cookie)
 	return PrintGetScreenOfContextCookie{cookie}
@@ -930,6 +975,9 @@ func PrintGetScreenOfContext(c *xgb.Conn) PrintGetScreenOfContextCookie {
 // PrintGetScreenOfContextUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetScreenOfContextUnchecked(c *xgb.Conn) PrintGetScreenOfContextCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetScreenOfContext' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetScreenOfContextRequest(c), cookie)
 	return PrintGetScreenOfContextCookie{cookie}
@@ -1001,6 +1049,9 @@ type PrintStartJobCookie struct {
 // PrintStartJob sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintStartJob(c *xgb.Conn, OutputMode byte) PrintStartJobCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartJob' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printStartJobRequest(c, OutputMode), cookie)
 	return PrintStartJobCookie{cookie}
@@ -1009,6 +1060,9 @@ func PrintStartJob(c *xgb.Conn, OutputMode byte) PrintStartJobCookie {
 // PrintStartJobChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintStartJobCookie.Check()
 func PrintStartJobChecked(c *xgb.Conn, OutputMode byte) PrintStartJobCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartJob' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printStartJobRequest(c, OutputMode), cookie)
 	return PrintStartJobCookie{cookie}
@@ -1050,6 +1104,9 @@ type PrintEndJobCookie struct {
 // PrintEndJob sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintEndJob(c *xgb.Conn, Cancel bool) PrintEndJobCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndJob' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printEndJobRequest(c, Cancel), cookie)
 	return PrintEndJobCookie{cookie}
@@ -1058,6 +1115,9 @@ func PrintEndJob(c *xgb.Conn, Cancel bool) PrintEndJobCookie {
 // PrintEndJobChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintEndJobCookie.Check()
 func PrintEndJobChecked(c *xgb.Conn, Cancel bool) PrintEndJobCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndJob' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printEndJobRequest(c, Cancel), cookie)
 	return PrintEndJobCookie{cookie}
@@ -1103,6 +1163,9 @@ type PrintStartDocCookie struct {
 // PrintStartDoc sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintStartDoc(c *xgb.Conn, DriverMode byte) PrintStartDocCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartDoc' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printStartDocRequest(c, DriverMode), cookie)
 	return PrintStartDocCookie{cookie}
@@ -1111,6 +1174,9 @@ func PrintStartDoc(c *xgb.Conn, DriverMode byte) PrintStartDocCookie {
 // PrintStartDocChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintStartDocCookie.Check()
 func PrintStartDocChecked(c *xgb.Conn, DriverMode byte) PrintStartDocCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartDoc' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printStartDocRequest(c, DriverMode), cookie)
 	return PrintStartDocCookie{cookie}
@@ -1152,6 +1218,9 @@ type PrintEndDocCookie struct {
 // PrintEndDoc sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintEndDoc(c *xgb.Conn, Cancel bool) PrintEndDocCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndDoc' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printEndDocRequest(c, Cancel), cookie)
 	return PrintEndDocCookie{cookie}
@@ -1160,6 +1229,9 @@ func PrintEndDoc(c *xgb.Conn, Cancel bool) PrintEndDocCookie {
 // PrintEndDocChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintEndDocCookie.Check()
 func PrintEndDocChecked(c *xgb.Conn, Cancel bool) PrintEndDocCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndDoc' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printEndDocRequest(c, Cancel), cookie)
 	return PrintEndDocCookie{cookie}
@@ -1205,6 +1277,9 @@ type PrintPutDocumentDataCookie struct {
 // PrintPutDocumentData sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintPutDocumentData(c *xgb.Conn, Drawable xproto.Drawable, LenData uint32, LenFmt uint16, LenOptions uint16, Data []byte, DocFormat []String8, Options []String8) PrintPutDocumentDataCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintPutDocumentData' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printPutDocumentDataRequest(c, Drawable, LenData, LenFmt, LenOptions, Data, DocFormat, Options), cookie)
 	return PrintPutDocumentDataCookie{cookie}
@@ -1213,6 +1288,9 @@ func PrintPutDocumentData(c *xgb.Conn, Drawable xproto.Drawable, LenData uint32,
 // PrintPutDocumentDataChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintPutDocumentDataCookie.Check()
 func PrintPutDocumentDataChecked(c *xgb.Conn, Drawable xproto.Drawable, LenData uint32, LenFmt uint16, LenOptions uint16, Data []byte, DocFormat []String8, Options []String8) PrintPutDocumentDataCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintPutDocumentData' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printPutDocumentDataRequest(c, Drawable, LenData, LenFmt, LenOptions, Data, DocFormat, Options), cookie)
 	return PrintPutDocumentDataCookie{cookie}
@@ -1278,6 +1356,9 @@ type PrintGetDocumentDataCookie struct {
 // PrintGetDocumentData sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetDocumentDataCookie.Reply()
 func PrintGetDocumentData(c *xgb.Conn, Context Pcontext, MaxBytes uint32) PrintGetDocumentDataCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetDocumentData' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetDocumentDataRequest(c, Context, MaxBytes), cookie)
 	return PrintGetDocumentDataCookie{cookie}
@@ -1286,6 +1367,9 @@ func PrintGetDocumentData(c *xgb.Conn, Context Pcontext, MaxBytes uint32) PrintG
 // PrintGetDocumentDataUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetDocumentDataUnchecked(c *xgb.Conn, Context Pcontext, MaxBytes uint32) PrintGetDocumentDataCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetDocumentData' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetDocumentDataRequest(c, Context, MaxBytes), cookie)
 	return PrintGetDocumentDataCookie{cookie}
@@ -1379,6 +1463,9 @@ type PrintStartPageCookie struct {
 // PrintStartPage sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintStartPage(c *xgb.Conn, Window xproto.Window) PrintStartPageCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartPage' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printStartPageRequest(c, Window), cookie)
 	return PrintStartPageCookie{cookie}
@@ -1387,6 +1474,9 @@ func PrintStartPage(c *xgb.Conn, Window xproto.Window) PrintStartPageCookie {
 // PrintStartPageChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintStartPageCookie.Check()
 func PrintStartPageChecked(c *xgb.Conn, Window xproto.Window) PrintStartPageCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintStartPage' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printStartPageRequest(c, Window), cookie)
 	return PrintStartPageCookie{cookie}
@@ -1428,6 +1518,9 @@ type PrintEndPageCookie struct {
 // PrintEndPage sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintEndPage(c *xgb.Conn, Cancel bool) PrintEndPageCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndPage' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printEndPageRequest(c, Cancel), cookie)
 	return PrintEndPageCookie{cookie}
@@ -1436,6 +1529,9 @@ func PrintEndPage(c *xgb.Conn, Cancel bool) PrintEndPageCookie {
 // PrintEndPageChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintEndPageCookie.Check()
 func PrintEndPageChecked(c *xgb.Conn, Cancel bool) PrintEndPageCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintEndPage' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printEndPageRequest(c, Cancel), cookie)
 	return PrintEndPageCookie{cookie}
@@ -1483,6 +1579,9 @@ type PrintSelectInputCookie struct {
 // PrintSelectInput sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintSelectInput(c *xgb.Conn, Context Pcontext, EventMask uint32, EventList []uint32) PrintSelectInputCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSelectInput' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printSelectInputRequest(c, Context, EventMask, EventList), cookie)
 	return PrintSelectInputCookie{cookie}
@@ -1491,6 +1590,9 @@ func PrintSelectInput(c *xgb.Conn, Context Pcontext, EventMask uint32, EventList
 // PrintSelectInputChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintSelectInputCookie.Check()
 func PrintSelectInputChecked(c *xgb.Conn, Context Pcontext, EventMask uint32, EventList []uint32) PrintSelectInputCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSelectInput' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printSelectInputRequest(c, Context, EventMask, EventList), cookie)
 	return PrintSelectInputCookie{cookie}
@@ -1540,6 +1642,9 @@ type PrintInputSelectedCookie struct {
 // PrintInputSelected sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintInputSelectedCookie.Reply()
 func PrintInputSelected(c *xgb.Conn, Context Pcontext) PrintInputSelectedCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintInputSelected' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printInputSelectedRequest(c, Context), cookie)
 	return PrintInputSelectedCookie{cookie}
@@ -1548,6 +1653,9 @@ func PrintInputSelected(c *xgb.Conn, Context Pcontext) PrintInputSelectedCookie
 // PrintInputSelectedUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintInputSelectedUnchecked(c *xgb.Conn, Context Pcontext) PrintInputSelectedCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintInputSelected' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printInputSelectedRequest(c, Context), cookie)
 	return PrintInputSelectedCookie{cookie}
@@ -1642,6 +1750,9 @@ type PrintGetAttributesCookie struct {
 // PrintGetAttributes sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetAttributesCookie.Reply()
 func PrintGetAttributes(c *xgb.Conn, Context Pcontext, Pool byte) PrintGetAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetAttributesRequest(c, Context, Pool), cookie)
 	return PrintGetAttributesCookie{cookie}
@@ -1650,6 +1761,9 @@ func PrintGetAttributes(c *xgb.Conn, Context Pcontext, Pool byte) PrintGetAttrib
 // PrintGetAttributesUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetAttributesUnchecked(c *xgb.Conn, Context Pcontext, Pool byte) PrintGetAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetAttributesRequest(c, Context, Pool), cookie)
 	return PrintGetAttributesCookie{cookie}
@@ -1736,6 +1850,9 @@ type PrintGetOneAttributesCookie struct {
 // PrintGetOneAttributes sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetOneAttributesCookie.Reply()
 func PrintGetOneAttributes(c *xgb.Conn, Context Pcontext, NameLen uint32, Pool byte, Name []String8) PrintGetOneAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetOneAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetOneAttributesRequest(c, Context, NameLen, Pool, Name), cookie)
 	return PrintGetOneAttributesCookie{cookie}
@@ -1744,6 +1861,9 @@ func PrintGetOneAttributes(c *xgb.Conn, Context Pcontext, NameLen uint32, Pool b
 // PrintGetOneAttributesUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetOneAttributesUnchecked(c *xgb.Conn, Context Pcontext, NameLen uint32, Pool byte, Name []String8) PrintGetOneAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetOneAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetOneAttributesRequest(c, Context, NameLen, Pool, Name), cookie)
 	return PrintGetOneAttributesCookie{cookie}
@@ -1843,6 +1963,9 @@ type PrintSetAttributesCookie struct {
 // PrintSetAttributes sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintSetAttributes(c *xgb.Conn, Context Pcontext, StringLen uint32, Pool byte, Rule byte, Attributes []String8) PrintSetAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, false)
 	c.NewRequest(printSetAttributesRequest(c, Context, StringLen, Pool, Rule, Attributes), cookie)
 	return PrintSetAttributesCookie{cookie}
@@ -1851,6 +1974,9 @@ func PrintSetAttributes(c *xgb.Conn, Context Pcontext, StringLen uint32, Pool by
 // PrintSetAttributesChecked sends a checked request.
 // If an error occurs, it can be retrieved using PrintSetAttributesCookie.Check()
 func PrintSetAttributesChecked(c *xgb.Conn, Context Pcontext, StringLen uint32, Pool byte, Rule byte, Attributes []String8) PrintSetAttributesCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetAttributes' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, false)
 	c.NewRequest(printSetAttributesRequest(c, Context, StringLen, Pool, Rule, Attributes), cookie)
 	return PrintSetAttributesCookie{cookie}
@@ -1909,6 +2035,9 @@ type PrintGetPageDimensionsCookie struct {
 // PrintGetPageDimensions sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetPageDimensionsCookie.Reply()
 func PrintGetPageDimensions(c *xgb.Conn, Context Pcontext) PrintGetPageDimensionsCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetPageDimensions' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetPageDimensionsRequest(c, Context), cookie)
 	return PrintGetPageDimensionsCookie{cookie}
@@ -1917,6 +2046,9 @@ func PrintGetPageDimensions(c *xgb.Conn, Context Pcontext) PrintGetPageDimension
 // PrintGetPageDimensionsUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetPageDimensionsUnchecked(c *xgb.Conn, Context Pcontext) PrintGetPageDimensionsCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetPageDimensions' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetPageDimensionsRequest(c, Context), cookie)
 	return PrintGetPageDimensionsCookie{cookie}
@@ -2011,6 +2143,9 @@ type PrintQueryScreensCookie struct {
 // PrintQueryScreens sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintQueryScreensCookie.Reply()
 func PrintQueryScreens(c *xgb.Conn) PrintQueryScreensCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintQueryScreens' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printQueryScreensRequest(c), cookie)
 	return PrintQueryScreensCookie{cookie}
@@ -2019,6 +2154,9 @@ func PrintQueryScreens(c *xgb.Conn) PrintQueryScreensCookie {
 // PrintQueryScreensUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintQueryScreensUnchecked(c *xgb.Conn) PrintQueryScreensCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintQueryScreens' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printQueryScreensRequest(c), cookie)
 	return PrintQueryScreensCookie{cookie}
@@ -2101,6 +2239,9 @@ type PrintSetImageResolutionCookie struct {
 // PrintSetImageResolution sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintSetImageResolutionCookie.Reply()
 func PrintSetImageResolution(c *xgb.Conn, Context Pcontext, ImageResolution uint16) PrintSetImageResolutionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetImageResolution' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printSetImageResolutionRequest(c, Context, ImageResolution), cookie)
 	return PrintSetImageResolutionCookie{cookie}
@@ -2109,6 +2250,9 @@ func PrintSetImageResolution(c *xgb.Conn, Context Pcontext, ImageResolution uint
 // PrintSetImageResolutionUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintSetImageResolutionUnchecked(c *xgb.Conn, Context Pcontext, ImageResolution uint16) PrintSetImageResolutionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintSetImageResolution' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printSetImageResolutionRequest(c, Context, ImageResolution), cookie)
 	return PrintSetImageResolutionCookie{cookie}
@@ -2191,6 +2335,9 @@ type PrintGetImageResolutionCookie struct {
 // PrintGetImageResolution sends a checked request.
 // If an error occurs, it will be returned with the reply by calling PrintGetImageResolutionCookie.Reply()
 func PrintGetImageResolution(c *xgb.Conn, Context Pcontext) PrintGetImageResolutionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetImageResolution' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(true, true)
 	c.NewRequest(printGetImageResolutionRequest(c, Context), cookie)
 	return PrintGetImageResolutionCookie{cookie}
@@ -2199,6 +2346,9 @@ func PrintGetImageResolution(c *xgb.Conn, Context Pcontext) PrintGetImageResolut
 // PrintGetImageResolutionUnchecked sends an unchecked request.
 // If an error occurs, it can only be retrieved using xgb.WaitForEvent or xgb.PollForEvent.
 func PrintGetImageResolutionUnchecked(c *xgb.Conn, Context Pcontext) PrintGetImageResolutionCookie {
+	if _, ok := c.Extensions["XPEXTENSION"]; !ok {
+		panic("Cannot issue request 'PrintGetImageResolution' using the uninitialized extension 'XpExtension'. xprint.Init(connObj) must be called first.")
+	}
 	cookie := c.NewCookie(false, true)
 	c.NewRequest(printGetImageResolutionRequest(c, Context), cookie)
 	return PrintGetImageResolutionCookie{cookie}