converting to using Tcl_Obj API for error message generation; part done

27 files changed, 739 insertions, 592 deletions

diff --git a/generic/tclBasic.c b/generic/tclBasic.c
index 537750e..db365e3 100644
--- a/generic/tclBasic.c
+++ b/generic/tclBasic.c
@@ -1708,9 +1708,9 @@ Tcl_HideCommand(
      */
 
     if (strstr(hiddenCmdToken, "::") != NULL) {
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"cannot use namespace qualifiers in hidden command"
-		" token (rename)", NULL);
+		" token (rename)", -1));
         Tcl_SetErrorCode(interp, "TCL", "VALUE", "HIDDENTOKEN", NULL);
 	return TCL_ERROR;
     }
@@ -1733,8 +1733,9 @@ Tcl_HideCommand(
      */
 
     if (cmdPtr->nsPtr != iPtr->globalNsPtr) {
-	Tcl_AppendResult(interp, "can only hide global namespace commands"
-		" (use rename then hide)", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "can only hide global namespace commands (use rename then hide)",
+                -1));
         Tcl_SetErrorCode(interp, "TCL", "HIDE", "NON_GLOBAL", NULL);
 	return TCL_ERROR;
     }
@@ -1758,8 +1759,9 @@ Tcl_HideCommand(
 
     hPtr = Tcl_CreateHashEntry(hiddenCmdTablePtr, hiddenCmdToken, &isNew);
     if (!isNew) {
-	Tcl_AppendResult(interp, "hidden command named \"", hiddenCmdToken,
-		"\" already exists", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "hidden command named \"%s\" already exists",
+                hiddenCmdToken));
         Tcl_SetErrorCode(interp, "TCL", "HIDE", "ALREADY_HIDDEN", NULL);
 	return TCL_ERROR;
     }
@@ -1861,8 +1863,9 @@ Tcl_ExposeCommand(
      */
 
     if (strstr(cmdName, "::") != NULL) {
-	Tcl_AppendResult(interp, "cannot expose to a namespace "
-		"(use expose to toplevel, then rename)", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "cannot expose to a namespace (use expose to toplevel, then rename)",
+                -1));
         Tcl_SetErrorCode(interp, "TCL", "EXPOSE", "NON_GLOBAL", NULL);
 	return TCL_ERROR;
     }
@@ -1877,8 +1880,8 @@ Tcl_ExposeCommand(
 	hPtr = Tcl_FindHashEntry(hiddenCmdTablePtr, hiddenCmdToken);
     }
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "unknown hidden command \"", hiddenCmdToken,
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "unknown hidden command \"%s\"", hiddenCmdToken));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "HIDDENTOKEN",
                 hiddenCmdToken, NULL);
 	return TCL_ERROR;
@@ -1897,9 +1900,9 @@ Tcl_ExposeCommand(
 	 * than 'nicely' erroring out ?
 	 */
 
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"trying to expose a non-global command namespace command",
-		NULL);
+		-1));
 	return TCL_ERROR;
     }
 
@@ -1916,8 +1919,8 @@ Tcl_ExposeCommand(
 
     hPtr = Tcl_CreateHashEntry(&nsPtr->cmdTable, cmdName, &isNew);
     if (!isNew) {
-	Tcl_AppendResult(interp, "exposed command \"", cmdName,
-		"\" already exists", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "exposed command \"%s\" already exists", cmdName));
         Tcl_SetErrorCode(interp, "TCL", "EXPOSE", "COMMAND_EXISTS", NULL);
 	return TCL_ERROR;
     }
@@ -2497,9 +2500,10 @@ TclRenameCommand(
     cmd = Tcl_FindCommand(interp, oldName, NULL, /*flags*/ 0);
     cmdPtr = (Command *) cmd;
     if (cmdPtr == NULL) {
-	Tcl_AppendResult(interp, "can't ",
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't %s \"%s\": command doesn't exist",
 		((newName == NULL)||(*newName == '\0'))? "delete":"rename",
-		" \"", oldName, "\": command doesn't exist", NULL);
+		oldName));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND", oldName, NULL);
 	return TCL_ERROR;
     }
@@ -2529,15 +2533,15 @@ TclRenameCommand(
 	    TCL_CREATE_NS_IF_UNKNOWN, &newNsPtr, &dummy1, &dummy2, &newTail);
 
     if ((newNsPtr == NULL) || (newTail == NULL)) {
-	Tcl_AppendResult(interp, "can't rename to \"", newName,
-		"\": bad command name", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't rename to \"%s\": bad command name", newName));
         Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMMAND", NULL);
 	result = TCL_ERROR;
 	goto done;
     }
     if (Tcl_FindHashEntry(&newNsPtr->cmdTable, newTail) != NULL) {
-	Tcl_AppendResult(interp, "can't rename to \"", newName,
-		 "\": command already exists", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't rename to \"%s\": command already exists", newName));
         Tcl_SetErrorCode(interp, "TCL", "OPERATION", "RENAME",
                 "TARGET_EXISTS", NULL);
 	result = TCL_ERROR;
@@ -3538,9 +3542,9 @@ OldMathFuncProc(
 	     * We have a non-numeric argument.
 	     */
 
-	    Tcl_SetResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "argument to math function didn't have numeric value",
-		    TCL_STATIC);
+		    -1));
 	    TclCheckBadOctal(interp, Tcl_GetString(valuePtr));
 	    ckfree(args);
 	    return TCL_ERROR;
@@ -3827,9 +3831,8 @@ TclInterpReady(
      */
 
     if (iPtr->flags & DELETED) {
-	/* JJM - Superfluous Tcl_ResetResult call removed. */
-	Tcl_AppendResult(interp,
-		"attempt to call eval in deleted interpreter", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to call eval in deleted interpreter", -1));
 	Tcl_SetErrorCode(interp, "TCL", "IDELETE",
 		"attempt to call eval in deleted interpreter", NULL);
 	return TCL_ERROR;
@@ -3857,8 +3860,8 @@ TclInterpReady(
 	return TCL_OK;
     }
 
-    Tcl_AppendResult(interp,
-	    "too many nested evaluations (infinite loop?)", NULL);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    "too many nested evaluations (infinite loop?)", -1));
     Tcl_SetErrorCode(interp, "TCL", "LIMIT", "STACK", NULL);
     return TCL_ERROR;
 }
@@ -3992,8 +3995,7 @@ Tcl_Canceled(
             }
         }
 
-        Tcl_ResetResult(interp);
-        Tcl_AppendResult(interp, message, NULL);
+        Tcl_SetObjResult(interp, Tcl_NewStringObj(message, -1));
         Tcl_SetErrorCode(interp, "TCL", "CANCEL", id, message, NULL);
     }
 
@@ -4616,8 +4618,8 @@ TEOV_NotFound(
 
     cmdPtr = TEOV_LookupCmdFromObj(interp, newObjv[0], lookupNsPtr);
     if (cmdPtr == NULL) {
-	Tcl_AppendResult(interp, "invalid command name \"",
-		TclGetString(objv[0]), "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "invalid command name \"%s\"", TclGetString(objv[0])));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND",
                 TclGetString(objv[0]), NULL);
 
@@ -6285,11 +6287,11 @@ ProcessUnexpectedResult(
 
     Tcl_ResetResult(interp);
     if (returnCode == TCL_BREAK) {
-	Tcl_AppendResult(interp,
-		"invoked \"break\" outside of a loop", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"invoked \"break\" outside of a loop", -1));
     } else if (returnCode == TCL_CONTINUE) {
-	Tcl_AppendResult(interp,
-		"invoked \"continue\" outside of a loop", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"invoked \"continue\" outside of a loop", -1));
     } else {
 	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
 		"command returned bad code: %d", returnCode));
@@ -6624,7 +6626,8 @@ TclObjInvoke(
     }
 
     if ((objc < 1) || (objv == NULL)) {
-	Tcl_AppendResult(interp, "illegal argument vector", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "illegal argument vector", -1));
 	return TCL_ERROR;
     }
 
@@ -6642,8 +6645,8 @@ TclObjInvoke(
 	hPtr = Tcl_FindHashEntry(hTblPtr, cmdName);
     }
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "invalid hidden command name \"",
-		cmdName, "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "invalid hidden command name \"%s\"", cmdName));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "HIDDENTOKEN", cmdName,
                 NULL);
 	return TCL_ERROR;
@@ -7269,7 +7272,8 @@ ExprIsqrtFunc(
     return TCL_OK;
 
   negarg:
-    Tcl_SetResult(interp, "square root of negative argument", TCL_STATIC);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+            "square root of negative argument", -1));
     Tcl_SetErrorCode(interp, "ARITH", "DOMAIN",
 	    "domain error: argument not in valid range", NULL);
     return TCL_ERROR;
@@ -8319,9 +8323,8 @@ TclNRTailcallObjCmd(
     }
 
     if (!iPtr->varFramePtr->isProcCallFrame) {	/* or is upleveled */
-        Tcl_SetResult(interp,
-                "tailcall can only be called from a proc or lambda",
-                TCL_STATIC);
+        Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "tailcall can only be called from a proc or lambda", -1));
         Tcl_SetErrorCode(interp, "TCL", "TAILCALL", "ILLEGAL", NULL);
 	return TCL_ERROR;
     }
@@ -8480,8 +8483,8 @@ TclNRYieldObjCmd(
     }
 
     if (!corPtr) {
-	Tcl_SetResult(interp, "yield can only be called in a coroutine",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "yield can only be called in a coroutine", -1));
 	Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "ILLEGAL_YIELD", NULL);
 	return TCL_ERROR;
     }
@@ -8514,8 +8517,8 @@ TclNRYieldToObjCmd(
     }
 
     if (!corPtr) {
-	Tcl_SetResult(interp, "yieldto can only be called in a coroutine",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "yieldto can only be called in a coroutine", -1));
 	Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "ILLEGAL_YIELD", NULL);
 	return TCL_ERROR;
     }
@@ -8763,8 +8766,8 @@ NRCoroutineActivateCallback(
          */
 
         if (corPtr->stackLevel != stackLevel) {
-            Tcl_SetResult(interp, "cannot yield: C stack busy",
-                    TCL_STATIC);
+            Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                    "cannot yield: C stack busy", -1));
             Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "CANT_YIELD",
                     NULL);
             return TCL_ERROR;
@@ -8823,8 +8826,8 @@ NRCoroInjectObjCmd(
 
     cmdPtr = (Command *) Tcl_GetCommandFromObj(interp, objv[1]);
     if ((!cmdPtr) || (cmdPtr->nreProc != TclNRInterpCoroutine)) {
-        Tcl_AppendResult(interp, "can only inject a command into a coroutine",
-                NULL);
+        Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "can only inject a command into a coroutine", -1));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COROUTINE",
                 TclGetString(objv[1]), NULL);
         return TCL_ERROR;
@@ -8832,8 +8835,8 @@ NRCoroInjectObjCmd(
 
     corPtr = cmdPtr->objClientData;
     if (!COR_IS_SUSPENDED(corPtr)) {
-        Tcl_AppendResult(interp,
-                "can only inject a command into a suspended coroutine", NULL);
+        Tcl_SetObjResult(interp, Tcl_NewStringObj(
+                "can only inject a command into a suspended coroutine", -1));
         Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "ACTIVE", NULL);
         return TCL_ERROR;
     }
@@ -8860,9 +8863,9 @@ TclNRInterpCoroutine(
     CoroutineData *corPtr = clientData;
 
     if (!COR_IS_SUSPENDED(corPtr)) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "coroutine \"", Tcl_GetString(objv[0]),
-		"\" is already running", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "coroutine \"%s\" is already running",
+                Tcl_GetString(objv[0])));
 	Tcl_SetErrorCode(interp, "TCL", "COROUTINE", "BUSY", NULL);
 	return TCL_ERROR;
     }
@@ -8943,22 +8946,24 @@ TclNRCoroutineObjCmd(
 	    &nsPtr, &altNsPtr, &cxtNsPtr, &procName);
 
     if (nsPtr == NULL) {
-	Tcl_AppendResult(interp, "can't create procedure \"", fullName,
-		"\": unknown namespace", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't create procedure \"%s\": unknown namespace",
+                fullName));
         Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "NAMESPACE", NULL);
 	return TCL_ERROR;
     }
     if (procName == NULL) {
-	Tcl_AppendResult(interp, "can't create procedure \"", fullName,
-		"\": bad procedure name", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't create procedure \"%s\": bad procedure name",
+                fullName));
         Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMMAND", fullName, NULL);
 	return TCL_ERROR;
     }
     if ((nsPtr != iPtr->globalNsPtr)
 	    && (procName != NULL) && (procName[0] == ':')) {
-	Tcl_AppendResult(interp, "can't create procedure \"", procName,
-		"\" in non-global namespace with name starting with \":\"",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+                "can't create procedure \"%s\" in non-global namespace with"
+                " name starting with \":\"", procName));
         Tcl_SetErrorCode(interp, "TCL", "VALUE", "COMMAND", procName, NULL);
 	return TCL_ERROR;
     }
diff --git a/generic/tclClock.c b/generic/tclClock.c
index 7fa4017..e46ac69 100644
--- a/generic/tclClock.c
+++ b/generic/tclClock.c
@@ -878,8 +878,8 @@ ConvertLocalToUTCUsingC(
 
     if (localErrno != 0
 	    || (fields->seconds == -1 && timeVal.tm_yday == -1)) {
-	Tcl_SetResult(interp, "time value too large/small to represent",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"time value too large/small to represent", -1));
 	return TCL_ERROR;
     }
     return TCL_OK;
diff --git a/generic/tclCmdAH.c b/generic/tclCmdAH.c
index f09ee70..4bb993e 100644
--- a/generic/tclCmdAH.c
+++ b/generic/tclCmdAH.c
@@ -1842,7 +1842,7 @@ PathFilesystemCmd(
     }
     fsInfo = Tcl_FSFileSystemInfo(objv[1]);
     if (fsInfo == NULL) {
-	Tcl_SetResult(interp, "unrecognised path", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj("unrecognised path", -1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "FILESYSTEM",
 		Tcl_GetString(objv[1]), NULL);
 	return TCL_ERROR;
@@ -2092,7 +2092,8 @@ FilesystemSeparatorCmd(
 	Tcl_Obj *separatorObj = Tcl_FSPathSeparator(objv[1]);
 
 	if (separatorObj == NULL) {
-	    Tcl_SetResult(interp, "unrecognised path", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unrecognised path", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "FILESYSTEM",
 		    Tcl_GetString(objv[1]), NULL);
 	    return TCL_ERROR;
diff --git a/generic/tclCmdIL.c b/generic/tclCmdIL.c
index b312026..14e0092 100644
--- a/generic/tclCmdIL.c
+++ b/generic/tclCmdIL.c
@@ -27,15 +27,15 @@
  */
 
 typedef struct SortElement {
-    union {                     /* The value that we sorting by. */
+    union {			/* The value that we sorting by. */
 	const char *strValuePtr;
 	long intValue;
 	double doubleValue;
 	Tcl_Obj *objValuePtr;
     } collationKey;
-    union {             	/* Object being sorted, or its index. */
-        Tcl_Obj *objPtr;
-        int index;
+    union {			/* Object being sorted, or its index. */
+	Tcl_Obj *objPtr;
+	int index;
     } payload;
     struct SortElement *nextPtr;/* Next element in the list, or NULL for end
 				 * of list. */
@@ -229,8 +229,9 @@ TclNRIfObjCmd(
     Tcl_Obj *boolObj;
 
     if (objc <= 1) {
-	Tcl_AppendResult(interp, "wrong # args: no expression after \"",
-		TclGetString(objv[0]), "\" argument", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"wrong # args: no expression after \"%s\" argument",
+		TclGetString(objv[0])));
 	Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
 	return TCL_ERROR;
     }
@@ -319,8 +320,9 @@ IfConditionCallback(
 	 */
 
 	if (i >= objc) {
-	    Tcl_AppendResult(interp, "wrong # args: ",
-		    "no expression after \"", clause, "\" argument", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "wrong # args: no expression after \"%s\" argument",
+		    clause));
 	    Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
 	    return TCL_ERROR;
 	}
@@ -345,8 +347,9 @@ IfConditionCallback(
 	}
     }
     if (i < objc - 1) {
-	Tcl_AppendResult(interp, "wrong # args: ",
-		"extra words after \"else\" clause in \"if\" command", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"wrong # args: extra words after \"else\" clause in \"if\" command",
+		-1));
 	Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
 	return TCL_ERROR;
     }
@@ -361,9 +364,9 @@ IfConditionCallback(
     return TclNREvalObjEx(interp, objv[i], 0, iPtr->cmdFramePtr, i);
 
   missingScript:
-    clause = TclGetString(objv[i-1]);
-    Tcl_AppendResult(interp, "wrong # args: no script following \"", clause,
-	    "\" argument", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "wrong # args: no script following \"%s\" argument",
+	    TclGetString(objv[i-1])));
     Tcl_SetErrorCode(interp, "TCL", "WRONGARGS", NULL);
     return TCL_ERROR;
 }
@@ -491,7 +494,8 @@ InfoArgsCmd(
     name = TclGetString(objv[1]);
     procPtr = TclFindProc(iPtr, name);
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp, "\"", name, "\" isn't a procedure", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't a procedure", name));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", name, NULL);
 	return TCL_ERROR;
     }
@@ -552,7 +556,8 @@ InfoBodyCmd(
     name = TclGetString(objv[1]);
     procPtr = TclFindProc(iPtr, name);
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp, "\"", name, "\" isn't a procedure", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't a procedure", name));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", name, NULL);
 	return TCL_ERROR;
     }
@@ -981,7 +986,8 @@ InfoDefaultCmd(
 
     procPtr = TclFindProc(iPtr, procName);
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp, "\"", procName, "\" isn't a procedure",NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't a procedure", procName));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "PROCEDURE", procName,
 		NULL);
 	return TCL_ERROR;
@@ -1012,8 +1018,9 @@ InfoDefaultCmd(
 	}
     }
 
-    Tcl_AppendResult(interp, "procedure \"", procName,
-	    "\" doesn't have an argument \"", argName, "\"", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "procedure \"%s\" doesn't have an argument \"%s\"",
+	    procName, argName));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARGUMENT", argName, NULL);
     return TCL_ERROR;
 }
@@ -1055,10 +1062,10 @@ InfoErrorStackCmd(
 
     target = interp;
     if (objc == 2) {
-        target = Tcl_GetSlave(interp, Tcl_GetString(objv[1]));
-        if (target == NULL) {
-            return TCL_ERROR;
-        }
+	target = Tcl_GetSlave(interp, Tcl_GetString(objv[1]));
+	if (target == NULL) {
+	    return TCL_ERROR;
+	}
     }
 
     iPtr = (Interp *) target;
@@ -1158,12 +1165,13 @@ InfoFrameCmd(
 	 * A coroutine: must fix the level computations AND the cmdFrame chain,
 	 * which is interrupted at the base.
 	 */
+
 	CmdFrame *lastPtr = NULL;
 
-        runPtr = iPtr->cmdFramePtr;
+	runPtr = iPtr->cmdFramePtr;
 
 	/* TODO - deal with overflow */
-        topLevel += corPtr->caller.cmdFramePtr->level;
+	topLevel += corPtr->caller.cmdFramePtr->level;
 	while (runPtr) {
 	    runPtr->level += corPtr->caller.cmdFramePtr->level;
 	    lastPtr = runPtr;
@@ -1196,8 +1204,8 @@ InfoFrameCmd(
 
     if ((level > topLevel) || (level <= - topLevel)) {
     levelError:
-	Tcl_AppendResult(interp, "bad level \"", TclGetString(objv[1]), "\"",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad level \"%s\"", TclGetString(objv[1])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "STACK_FRAME",
 		TclGetString(objv[1]), NULL);
 	code = TCL_ERROR;
@@ -1401,15 +1409,15 @@ TclInfoFrame(
 	Tcl_HashEntry *namePtr = procPtr->cmdPtr->hPtr;
 
 	if (namePtr) {
-            Tcl_Obj *procNameObj;
+	    Tcl_Obj *procNameObj;
 
 	    /*
 	     * This is a regular command.
 	     */
 
-            TclNewObj(procNameObj);
-            Tcl_GetCommandFullName(interp, (Tcl_Command) procPtr->cmdPtr,
-                    procNameObj);
+	    TclNewObj(procNameObj);
+	    Tcl_GetCommandFullName(interp, (Tcl_Command) procPtr->cmdPtr,
+		    procNameObj);
 	    ADD_PAIR("proc", procNameObj);
 	} else if (procPtr->cmdPtr->clientData) {
 	    ExtraFrameInfo *efiPtr = procPtr->cmdPtr->clientData;
@@ -1538,7 +1546,9 @@ InfoHostnameCmd(
 	Tcl_SetObjResult(interp, Tcl_NewStringObj(name, -1));
 	return TCL_OK;
     }
-    Tcl_SetResult(interp, "unable to determine name of host", TCL_STATIC);
+
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    "unable to determine name of host", -1));
     Tcl_SetErrorCode(interp, "TCL", "OPERATION", "HOSTNAME", "UNKNOWN", NULL);
     return TCL_ERROR;
 }
@@ -1609,8 +1619,8 @@ InfoLevelCmd(
     return TCL_ERROR;
 
   levelError:
-    Tcl_AppendResult(interp, "bad level \"", TclGetString(objv[1]), "\"",
-	    NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "bad level \"%s\"", TclGetString(objv[1])));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "STACK_LEVEL",
 	    TclGetString(objv[1]), NULL);
     return TCL_ERROR;
@@ -1656,7 +1666,9 @@ InfoLibraryCmd(
 	Tcl_SetObjResult(interp, Tcl_NewStringObj(libDirName, -1));
 	return TCL_OK;
     }
-    Tcl_SetResult(interp, "no library has been specified for Tcl",TCL_STATIC);
+
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+	    "no library has been specified for Tcl", -1));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", "tcl_library",NULL);
     return TCL_ERROR;
 }
@@ -2590,9 +2602,10 @@ Tcl_LrepeatObjCmd(
 	return TCL_ERROR;
     }
     if (elementCount < 0) {
-	Tcl_SetObjResult(interp, Tcl_Format(NULL,
-		"bad count \"%d\": must be integer >= 0", 1, objv+1));
-        Tcl_SetErrorCode(interp, "TCL","OPERATION","LREPEAT","NEGARG", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad count \"%d\": must be integer >= 0", elementCount));
+	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LREPEAT", "NEGARG",
+		NULL);
 	return TCL_ERROR;
     }
 
@@ -2608,7 +2621,7 @@ Tcl_LrepeatObjCmd(
     if (elementCount && objc > LIST_MAX/elementCount) {
 	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
 		"max length of a Tcl list (%d elements) exceeded", LIST_MAX));
-        Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL);
+	Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL);
 	return TCL_ERROR;
     }
     totalElems = objc * elementCount;
@@ -2723,9 +2736,10 @@ Tcl_LreplaceObjCmd(
      */
 
     if ((first >= listLen) && (listLen > 0)) {
-	Tcl_AppendResult(interp, "list doesn't contain element ",
-		TclGetString(objv[2]), NULL);
-        Tcl_SetErrorCode(interp, "TCL","OPERATION","LREPLACE","BADIDX", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"list doesn't contain element %s", TclGetString(objv[2])));
+	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LREPLACE", "BADIDX",
+		NULL);
 	return TCL_ERROR;
     }
     if (last >= listLen) {
@@ -2996,8 +3010,9 @@ Tcl_LsearchObjCmd(
 		Tcl_DecrRefCount(startPtr);
 	    }
 	    if (i > objc-4) {
-		Tcl_AppendResult(interp, "missing starting index", NULL);
-                Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"missing starting index", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
 		result = TCL_ERROR;
 		goto done;
 	    }
@@ -3027,10 +3042,10 @@ Tcl_LsearchObjCmd(
 		if (startPtr != NULL) {
 		    Tcl_DecrRefCount(startPtr);
 		}
-		Tcl_AppendResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"\"-index\" option must be followed by list index",
-			NULL);
-                Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
+			-1));
+		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
 		return TCL_ERROR;
 	    }
 
@@ -3088,18 +3103,18 @@ Tcl_LsearchObjCmd(
 	if (startPtr != NULL) {
 	    Tcl_DecrRefCount(startPtr);
 	}
-	Tcl_AppendResult(interp,
-		"-subindices cannot be used without -index option", NULL);
-        Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
-                "BAD_OPTION_MIX", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"-subindices cannot be used without -index option", -1));
+	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
+		"BAD_OPTION_MIX", NULL);
 	return TCL_ERROR;
     }
 
     if (bisect && (allMatches || negatedMatch)) {
-	Tcl_AppendResult(interp,
-		"-bisect is not compatible with -all or -not", NULL);
-        Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
-                "BAD_OPTION_MIX", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"-bisect is not compatible with -all or -not", -1));
+	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSEARCH",
+		"BAD_OPTION_MIX", NULL);
 	return TCL_ERROR;
     }
 
@@ -3531,7 +3546,7 @@ Tcl_LsetObjCmd(
 
     if (objc < 3) {
 	Tcl_WrongNumArgs(interp, 1, objv,
-                "listVar ?index? ?index ...? value");
+		"listVar ?index? ?index ...? value");
 	return TCL_ERROR;
     }
 
@@ -3664,10 +3679,10 @@ Tcl_LsortObjCmd(
 	    break;
 	case LSORT_COMMAND:
 	    if (i == objc-2) {
-		Tcl_AppendResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"\"-command\" option must be followed "
-			"by comparison command", NULL);
-                Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
+			"by comparison command", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
 		sortInfo.resultCode = TCL_ERROR;
 		goto done2;
 	    }
@@ -3685,29 +3700,30 @@ Tcl_LsortObjCmd(
 	    sortInfo.isIncreasing = 1;
 	    break;
 	case LSORT_INDEX: {
-            int indexc, dummy;
+	    int indexc, dummy;
 	    Tcl_Obj **indexv;
 
 	    if (i == objc-2) {
-		Tcl_AppendResult(interp, "\"-index\" option must be "
-			"followed by list index", NULL);
-                Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
-                sortInfo.resultCode = TCL_ERROR;
-                goto done2;
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"\"-index\" option must be followed by list index",
+			-1));
+		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
+		sortInfo.resultCode = TCL_ERROR;
+		goto done2;
 	    }
 	    if (TclListObjGetElements(interp, objv[i+1], &indexc,
 		    &indexv) != TCL_OK) {
-                sortInfo.resultCode = TCL_ERROR;
-                goto done2;
+		sortInfo.resultCode = TCL_ERROR;
+		goto done2;
 	    }
 
-            /*
-             * Check each of the indices for syntactic correctness. Note that
-             * we do not store the converted values here because we do not
-             * know if this is the only -index option yet and so we can't
-             * allocate any space; that happens after the scan through all the
-             * options is done.
-             */
+	    /*
+	     * Check each of the indices for syntactic correctness. Note that
+	     * we do not store the converted values here because we do not
+	     * know if this is the only -index option yet and so we can't
+	     * allocate any space; that happens after the scan through all the
+	     * options is done.
+	     */
 
 	    for (j=0 ; j<indexc ; j++) {
 		if (TclGetIntForIndexM(interp, indexv[j], SORTIDX_END,
@@ -3719,7 +3735,7 @@ Tcl_LsortObjCmd(
 		}
 	    }
 	    indexPtr = objv[i+1];
-            i++;
+	    i++;
 	    break;
 	}
 	case LSORT_INTEGER:
@@ -3739,9 +3755,10 @@ Tcl_LsortObjCmd(
 	    break;
 	case LSORT_STRIDE:
 	    if (i == objc-2) {
-		Tcl_AppendResult(interp, "\"-stride\" option must be ",
-			"followed by stride length", NULL);
-                Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"\"-stride\" option must be "
+			"followed by stride length", -1));
+		Tcl_SetErrorCode(interp, "TCL", "ARGUMENT", "MISSING", NULL);
 		sortInfo.resultCode = TCL_ERROR;
 		goto done2;
 	    }
@@ -3750,10 +3767,10 @@ Tcl_LsortObjCmd(
 		goto done2;
 	    }
 	    if (groupSize < 2) {
-		Tcl_AppendResult(interp, "stride length must be at least 2",
-			NULL);
-                Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
-                        "BADSTRIDE", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"stride length must be at least 2", -1));
+		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
+			"BADSTRIDE", NULL);
 		sortInfo.resultCode = TCL_ERROR;
 		goto done2;
 	    }
@@ -3773,26 +3790,26 @@ Tcl_LsortObjCmd(
      */
 
     if (indexPtr) {
-        Tcl_Obj **indexv;
-
-        TclListObjGetElements(interp, indexPtr, &sortInfo.indexc, &indexv);
-        switch (sortInfo.indexc) {
-        case 0:
-            sortInfo.indexv = NULL;
-            break;
-        case 1:
-            sortInfo.indexv = &sortInfo.singleIndex;
-            break;
-        default:
-            sortInfo.indexv =
+	Tcl_Obj **indexv;
+
+	TclListObjGetElements(interp, indexPtr, &sortInfo.indexc, &indexv);
+	switch (sortInfo.indexc) {
+	case 0:
+	    sortInfo.indexv = NULL;
+	    break;
+	case 1:
+	    sortInfo.indexv = &sortInfo.singleIndex;
+	    break;
+	default:
+	    sortInfo.indexv =
 		    TclStackAlloc(interp, sizeof(int) * sortInfo.indexc);
-            allocatedIndexVector = 1;	/* Cannot use indexc field, as it
-                                         * might be decreased by 1 later. */
-        }
-        for (j=0 ; j<sortInfo.indexc ; j++) {
-            TclGetIntForIndexM(interp, indexv[j], SORTIDX_END,
+	    allocatedIndexVector = 1;	/* Cannot use indexc field, as it
+					 * might be decreased by 1 later. */
+	}
+	for (j=0 ; j<sortInfo.indexc ; j++) {
+	    TclGetIntForIndexM(interp, indexv[j], SORTIDX_END,
 		    &sortInfo.indexv[j]);
-        }
+	}
     }
 
     listObj = objv[objc-1];
@@ -3847,11 +3864,11 @@ Tcl_LsortObjCmd(
 
     if (group) {
 	if (length % groupSize) {
-	    Tcl_AppendResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "list size must be a multiple of the stride length",
+		    -1));
+	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT", "BADSTRIDE",
 		    NULL);
-            Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT", "BADSTRIDE",
-                    NULL);
 	    sortInfo.resultCode = TCL_ERROR;
 	    goto done;
 	}
@@ -3867,11 +3884,11 @@ Tcl_LsortObjCmd(
 		groupOffset = (groupOffset - SORTIDX_END) + groupSize - 1;
 	    }
 	    if (groupOffset < 0 || groupOffset >= groupSize) {
-		Tcl_AppendResult(interp, "when used with \"-stride\", the "
-			"leading \"-index\" value must be within the group",
-			NULL);
-                Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
-                        "BADINDEX", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"when used with \"-stride\", the leading \"-index\""
+			" value must be within the group", -1));
+		Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LSORT",
+			"BADINDEX", NULL);
 		sortInfo.resultCode = TCL_ERROR;
 		goto done;
 	    }
@@ -4255,11 +4272,10 @@ SortCompare(
 
 	if (TclGetIntFromObj(infoPtr->interp,
 		Tcl_GetObjResult(infoPtr->interp), &order) != TCL_OK) {
-	    Tcl_ResetResult(infoPtr->interp);
-	    Tcl_AppendResult(infoPtr->interp,
-		    "-compare command returned non-integer result", NULL);
-            Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
-                    "COMPARISONFAILED", NULL);
+	    Tcl_SetObjResult(infoPtr->interp, Tcl_NewStringObj(
+		    "-compare command returned non-integer result", -1));
+	    Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
+		    "COMPARISONFAILED", NULL);
 	    infoPtr->resultCode = TCL_ERROR;
 	    return 0;
 	}
@@ -4470,11 +4486,11 @@ SelectObjFromSublist(
 	    return NULL;
 	}
 	if (currentObj == NULL) {
-            Tcl_SetObjResult(infoPtr->interp, Tcl_ObjPrintf(
-                    "element %d missing from sublist \"%s\"",
-                    index, TclGetString(objPtr)));
-            Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
-                    "INDEXFAILED", NULL);
+	    Tcl_SetObjResult(infoPtr->interp, Tcl_ObjPrintf(
+		    "element %d missing from sublist \"%s\"",
+		    index, TclGetString(objPtr)));
+	    Tcl_SetErrorCode(infoPtr->interp, "TCL", "OPERATION", "LSORT",
+		    "INDEXFAILED", NULL);
 	    infoPtr->resultCode = TCL_ERROR;
 	    return NULL;
 	}
@@ -4489,6 +4505,5 @@ SelectObjFromSublist(
  * c-basic-offset: 4
  * fill-column: 78
  * tab-width: 8
- * indent-tabs-mode: nil
  * End:
  */
diff --git a/generic/tclConfig.c b/generic/tclConfig.c
index dea487a..a4ba71a 100644
--- a/generic/tclConfig.c
+++ b/generic/tclConfig.c
@@ -236,7 +236,7 @@ QueryConfigObjCmd(
 	 * present.
 	 */
 
-	Tcl_SetResult(interp, "package not known", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj("package not known", -1));
 	Tcl_SetErrorCode(interp, "TCL", "FATAL", "PKGCFG_BASE",
 		Tcl_GetString(pkgName), NULL);
 	return TCL_ERROR;
@@ -251,7 +251,7 @@ QueryConfigObjCmd(
 
 	if (Tcl_DictObjGet(interp, pkgDict, objv[2], &val) != TCL_OK
 		|| val == NULL) {
-	    Tcl_SetResult(interp, "key not known", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj("key not known", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CONFIG",
 		    Tcl_GetString(objv[2]), NULL);
 	    return TCL_ERROR;
@@ -270,8 +270,8 @@ QueryConfigObjCmd(
 	listPtr = Tcl_NewListObj(n, NULL);
 
 	if (!listPtr) {
-	    Tcl_SetResult(interp, "insufficient memory to create list",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "insufficient memory to create list", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "MEMORY", NULL);
 	    return TCL_ERROR;
 	}
diff --git a/generic/tclDictObj.c b/generic/tclDictObj.c
index ac2cb62..691fab9 100644
--- a/generic/tclDictObj.c
+++ b/generic/tclDictObj.c
@@ -700,7 +700,8 @@ SetDictFromAny(
 
   missingValue:
     if (interp != NULL) {
-	Tcl_SetResult(interp, "missing value to go with key", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"missing value to go with key", -1));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "DICTIONARY", NULL);
     }
     result = TCL_ERROR;
@@ -779,9 +780,9 @@ TclTraceDictPath(
 	    }
 	    if ((flags & DICT_PATH_CREATE) != DICT_PATH_CREATE) {
 		if (interp != NULL) {
-		    Tcl_ResetResult(interp);
-		    Tcl_AppendResult(interp, "key \"", TclGetString(keyv[i]),
-			    "\" not known in dictionary", NULL);
+		    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			    "key \"%s\" not known in dictionary",
+			    TclGetString(keyv[i])));
 		    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "DICT",
 			    TclGetString(keyv[i]), NULL);
 		}
@@ -1571,9 +1572,9 @@ DictGetCmd(
 	return result;
     }
     if (valuePtr == NULL) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "key \"", TclGetString(objv[objc-1]),
-		"\" not known in dictionary", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"key \"%s\" not known in dictionary",
+		TclGetString(objv[objc-1])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "DICT",
 		TclGetString(objv[objc-1]), NULL);
 	return TCL_ERROR;
@@ -2027,6 +2028,7 @@ DictInfoCmd(
 {
     Tcl_Obj *dictPtr;
     Dict *dict;
+    char *statsStr;
 
     if (objc != 2) {
 	Tcl_WrongNumArgs(interp, 1, objv, "dictionary");
@@ -2042,7 +2044,9 @@ DictInfoCmd(
     }
     dict = dictPtr->internalRep.otherValuePtr;
 
-    Tcl_SetResult(interp, Tcl_HashStats(&dict->table), TCL_DYNAMIC);
+    statsStr = Tcl_HashStats(&dict->table);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(statsStr, -1));
+    ckfree(statsStr);
     return TCL_OK;
 }
 
@@ -2371,8 +2375,8 @@ DictForNRCmd(
 	return TCL_ERROR;
     }
     if (varc != 2) {
-	Tcl_SetResult(interp, "must have exactly two variable names",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"must have exactly two variable names", -1));
 	return TCL_ERROR;
     }
     searchPtr = TclStackAlloc(interp, sizeof(Tcl_DictSearch));
@@ -2787,8 +2791,8 @@ DictFilterCmd(
 	    return TCL_ERROR;
 	}
 	if (varc != 2) {
-	    Tcl_SetResult(interp, "must have exactly two variable names",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "must have exactly two variable names", -1));
 	    return TCL_ERROR;
 	}
 	keyVarObj = varv[0];
@@ -2828,16 +2832,19 @@ DictFilterCmd(
 	    if (Tcl_ObjSetVar2(interp, keyVarObj, NULL, keyObj,
 		    TCL_LEAVE_ERR_MSG) == NULL) {
 		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't set key variable: \"",
-			TclGetString(keyVarObj), "\"", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set key variable: \"%s\"",
+			TclGetString(keyVarObj)));
 		result = TCL_ERROR;
 		goto abnormalResult;
 	    }
 	    if (Tcl_ObjSetVar2(interp, valueVarObj, NULL, valueObj,
 		    TCL_LEAVE_ERR_MSG) == NULL) {
 		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't set value variable: \"",
-			TclGetString(valueVarObj), "\"", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"couldn't set value variable: \"%s\"",
+			TclGetString(valueVarObj)));
+		result = TCL_ERROR;
 		goto abnormalResult;
 	    }
 
diff --git a/generic/tclEnsemble.c b/generic/tclEnsemble.c
index 754e480..b76c603 100644
--- a/generic/tclEnsemble.c
+++ b/generic/tclEnsemble.c
@@ -17,6 +17,7 @@
  * Declarations for functions local to this file:
  */
 
+static inline Tcl_Obj *	NewNsObj(Tcl_Namespace *namespacePtr);
 static inline int	EnsembleUnknownCallback(Tcl_Interp *interp,
 			    EnsembleConfig *ensemblePtr, int objc,
 			    Tcl_Obj *const objv[], Tcl_Obj **prefixObjPtr);
@@ -78,6 +79,19 @@ const Tcl_ObjType tclEnsembleCmdType = {
     NULL			/* setFromAnyProc */
 };
 
+static inline Tcl_Obj *
+NewNsObj(
+    Tcl_Namespace *namespacePtr)
+{
+    register Namespace *nsPtr = (Namespace *) namespacePtr;
+
+    if (namespacePtr == TclGetGlobalNamespace(nsPtr->interp)) {
+	return Tcl_NewStringObj("::", 2);
+    } else {
+	return Tcl_NewStringObj(nsPtr->fullName, -1);
+    }
+}
+
 /*
  *----------------------------------------------------------------------
  *
@@ -116,9 +130,10 @@ TclNamespaceEnsembleCmd(
 
     if (nsPtr == NULL || nsPtr->flags & NS_DYING) {
 	if (!Tcl_InterpDeleted(interp)) {
-	    Tcl_AppendResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "tried to manipulate ensemble of deleted namespace",
-		    NULL);
+		    -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "DEAD", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -235,9 +250,11 @@ TclNamespaceEnsembleCmd(
 			return TCL_ERROR;
 		    }
 		    if (len < 1) {
-			Tcl_SetResult(interp,
+			Tcl_SetObjResult(interp, Tcl_NewStringObj(
 				"ensemble subcommand implementations "
-				"must be non-empty lists", TCL_STATIC);
+				"must be non-empty lists", -1));
+			Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
+				"EMPTY_TARGET", NULL);
 			Tcl_DictObjDone(&search);
 			if (patchedDict) {
 			    Tcl_DecrRefCount(patchedDict);
@@ -250,7 +267,7 @@ TclNamespaceEnsembleCmd(
 		    cmd = TclGetString(listv[0]);
 		    if (!(cmd[0] == ':' && cmd[1] == ':')) {
 			Tcl_Obj *newList = Tcl_NewListObj(len, listv);
-			Tcl_Obj *newCmd = Tcl_NewStringObj(nsPtr->fullName,-1);
+			Tcl_Obj *newCmd = NewNsObj((Tcl_Namespace *) nsPtr);
 
 			if (nsPtr->parentPtr) {
 			    Tcl_AppendStringsToObj(newCmd, "::", NULL);
@@ -370,8 +387,7 @@ TclNamespaceEnsembleCmd(
 	    case CONF_NAMESPACE:
 		namespacePtr = NULL;		/* silence gcc 4 warning */
 		Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
-		Tcl_SetResult(interp, ((Namespace *) namespacePtr)->fullName,
-			TCL_VOLATILE);
+		Tcl_SetObjResult(interp, NewNsObj(namespacePtr));
 		break;
 	    case CONF_PREFIX: {
 		int flags = 0;			/* silence gcc 4 warning */
@@ -411,9 +427,7 @@ TclNamespaceEnsembleCmd(
 			    -1));
 	    namespacePtr = NULL;		/* silence gcc 4 warning */
 	    Tcl_GetEnsembleNamespace(NULL, token, &namespacePtr);
-	    Tcl_ListObjAppendElement(NULL, resultObj,
-		    Tcl_NewStringObj(((Namespace *) namespacePtr)->fullName,
-			    -1));
+	    Tcl_ListObjAppendElement(NULL, resultObj, NewNsObj(namespacePtr));
 
 	    /* -parameters option */
 	    Tcl_ListObjAppendElement(NULL, resultObj,
@@ -515,9 +529,11 @@ TclNamespaceEnsembleCmd(
 			    goto freeMapAndError;
 			}
 			if (len < 1) {
-			    Tcl_SetResult(interp,
+			    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 				    "ensemble subcommand implementations "
-				    "must be non-empty lists", TCL_STATIC);
+				    "must be non-empty lists", -1));
+			    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
+				    "EMPTY_TARGET", NULL);
 			    Tcl_DictObjDone(&search);
 			    if (patchedDict) {
 				Tcl_DecrRefCount(patchedDict);
@@ -527,8 +543,7 @@ TclNamespaceEnsembleCmd(
 			cmd = TclGetString(listv[0]);
 			if (!(cmd[0] == ':' && cmd[1] == ':')) {
 			    Tcl_Obj *newList = Tcl_DuplicateObj(listObj);
-			    Tcl_Obj *newCmd =
-				    Tcl_NewStringObj(nsPtr->fullName, -1);
+			    Tcl_Obj *newCmd = NewNsObj((Tcl_Namespace*)nsPtr);
 
 			    if (nsPtr->parentPtr) {
 				Tcl_AppendStringsToObj(newCmd, "::", NULL);
@@ -554,7 +569,9 @@ TclNamespaceEnsembleCmd(
 		    continue;
 		}
 		case CONF_NAMESPACE:
-		    Tcl_AppendResult(interp, "option -namespace is read-only",
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "option -namespace is read-only", -1));
+		    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "READ_ONLY",
 			    NULL);
 		    goto freeMapAndError;
 		case CONF_PREFIX:
@@ -629,7 +646,7 @@ Tcl_CreateEnsemble(
      */
 
     if (!(name[0] == ':' && name[1] == ':')) {
-	nameObj = Tcl_NewStringObj(nsPtr->fullName, -1);
+	nameObj = NewNsObj((Tcl_Namespace *) nsPtr);
 	if (nsPtr->parentPtr == NULL) {
 	    Tcl_AppendStringsToObj(nameObj, name, NULL);
 	} else {
@@ -702,7 +719,9 @@ Tcl_SetEnsembleSubcommandList(
     Tcl_Obj *oldList;
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"command is not an ensemble", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	return TCL_ERROR;
     }
     if (subcmdList != NULL) {
@@ -776,7 +795,9 @@ Tcl_SetEnsembleParameterList(
     int length;
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"command is not an ensemble", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	return TCL_ERROR;
     }
     if (paramList == NULL) {
@@ -850,7 +871,9 @@ Tcl_SetEnsembleMappingDict(
     Tcl_Obj *oldDict;
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"command is not an ensemble", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	return TCL_ERROR;
     }
     if (mapDict != NULL) {
@@ -873,9 +896,11 @@ Tcl_SetEnsembleMappingDict(
 	    }
 	    bytes = TclGetString(cmdObjPtr);
 	    if (bytes[0] != ':' || bytes[1] != ':') {
-		Tcl_AppendResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"ensemble target is not a fully-qualified command",
-			NULL);
+			-1));
+		Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE",
+			"UNQUALIFIED_TARGET", NULL);
 		Tcl_DictObjDone(&search);
 		return TCL_ERROR;
 	    }
@@ -945,7 +970,9 @@ Tcl_SetEnsembleUnknownHandler(
     Tcl_Obj *oldList;
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"command is not an ensemble", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	return TCL_ERROR;
     }
     if (unknownList != NULL) {
@@ -1009,7 +1036,9 @@ Tcl_SetEnsembleFlags(
     int wasCompiled;
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
-	Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"command is not an ensemble", -1));
+	Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	return TCL_ERROR;
     }
 
@@ -1084,7 +1113,9 @@ Tcl_GetEnsembleSubcommandList(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1124,7 +1155,9 @@ Tcl_GetEnsembleParameterList(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1164,7 +1197,9 @@ Tcl_GetEnsembleMappingDict(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1203,7 +1238,9 @@ Tcl_GetEnsembleUnknownHandler(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1242,7 +1279,9 @@ Tcl_GetEnsembleFlags(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1281,7 +1320,9 @@ Tcl_GetEnsembleNamespace(
 
     if (cmdPtr->objProc != NsEnsembleImplementationCmd) {
 	if (interp != NULL) {
-	    Tcl_AppendResult(interp, "command is not an ensemble", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "command is not an ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "NOT_ENSEMBLE", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1337,8 +1378,9 @@ Tcl_FindEnsemble(
 
 	if (cmdPtr == NULL || cmdPtr->objProc != NsEnsembleImplementationCmd){
 	    if (flags & TCL_LEAVE_ERR_MSG) {
-		Tcl_AppendResult(interp, "\"", TclGetString(cmdNameObj),
-			"\" is not an ensemble command", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"\"%s\" is not an ensemble command",
+			TclGetString(cmdNameObj)));
 		Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
 			TclGetString(cmdNameObj), NULL);
 	    }
@@ -1591,6 +1633,7 @@ NsEnsembleImplementationCmdNR(
 				 * specified but not yet cached command
 				 * names. */
     int reparseCount = 0;	/* Number of reparses. */
+    Tcl_Obj *errorObj;		/* Used for building error messages. */
 
     /*
      * Must recheck objc, since numParameters might have changed. Cf. test
@@ -1631,8 +1674,9 @@ NsEnsembleImplementationCmdNR(
 	 */
 
 	if (!Tcl_InterpDeleted(interp)) {
-	    Tcl_AppendResult(interp,
-		    "ensemble activated for deleted namespace", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "ensemble activated for deleted namespace", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "DEAD", NULL);
 	}
 	return TCL_ERROR;
     }
@@ -1880,35 +1924,34 @@ NsEnsembleImplementationCmdNR(
      */
 
     Tcl_ResetResult(interp);
-    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ENSEMBLE",
+    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
 	    TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
     if (ensemblePtr->subcommandTable.numEntries == 0) {
-	Tcl_AppendResult(interp, "unknown subcommand \"",
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown subcommand \"%s\": namespace %s does not"
+		" export any commands",
 		TclGetString(objv[1+ensemblePtr->numParameters]),
-		"\": namespace ", ensemblePtr->nsPtr->fullName,
-		" does not export any commands", NULL);
+		ensemblePtr->nsPtr->fullName));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
 		TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
 	return TCL_ERROR;
     }
-    Tcl_AppendResult(interp, "unknown ",
-	    (ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? "or ambiguous " : ""),
-	    "subcommand \"", TclGetString(objv[1+ensemblePtr->numParameters]),
-	    "\": must be ", NULL);
+    errorObj = Tcl_ObjPrintf("unknown%s subcommand \"%s\": must be ",
+	    (ensemblePtr->flags & TCL_ENSEMBLE_PREFIX ? " or ambiguous" : ""),
+	    TclGetString(objv[1+ensemblePtr->numParameters]));
     if (ensemblePtr->subcommandTable.numEntries == 1) {
-	Tcl_AppendResult(interp, ensemblePtr->subcommandArrayPtr[0], NULL);
+	Tcl_AppendToObj(errorObj, ensemblePtr->subcommandArrayPtr[0], -1);
     } else {
 	int i;
 
 	for (i=0 ; i<ensemblePtr->subcommandTable.numEntries-1 ; i++) {
-	    Tcl_AppendResult(interp,
-		    ensemblePtr->subcommandArrayPtr[i], ", ", NULL);
+	    Tcl_AppendToObj(errorObj, ensemblePtr->subcommandArrayPtr[i], -1);
+	    Tcl_AppendToObj(errorObj, ", ", 2);
 	}
-	Tcl_AppendResult(interp, "or ",
-		ensemblePtr->subcommandArrayPtr[i], NULL);
+	Tcl_AppendPrintfToObj(errorObj, "or %s",
+		ensemblePtr->subcommandArrayPtr[i]);
     }
-    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "SUBCOMMAND",
-	    TclGetString(objv[1+ensemblePtr->numParameters]), NULL);
+    Tcl_SetObjResult(interp, errorObj);
     return TCL_ERROR;
 }
 
@@ -2034,7 +2077,6 @@ EnsembleUnknownCallback(
 {
     int paramc, i, result, prefixObjc;
     Tcl_Obj **paramv, *unknownCmd, *ensObj;
-    char buf[TCL_INTEGER_SPACE];
 
     /*
      * Create the unknown command callback to determine what to do.
@@ -2061,9 +2103,12 @@ EnsembleUnknownCallback(
     ((Interp *) interp)->evalFlags |= TCL_EVAL_REDIRECT;
     result = Tcl_EvalObjv(interp, paramc, paramv, 0);
     if ((result == TCL_OK) && (ensemblePtr->flags & ENSEMBLE_DEAD)) {
-	Tcl_SetResult(interp,
-		"unknown subcommand handler deleted its ensemble",
-		TCL_STATIC);
+	if (!Tcl_InterpDeleted(interp)) {
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unknown subcommand handler deleted its ensemble", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "UNKNOWN_DELETED",
+		    NULL);
+	}
 	result = TCL_ERROR;
     }
     Tcl_Release(ensemblePtr);
@@ -2112,26 +2157,26 @@ EnsembleUnknownCallback(
     if (!Tcl_InterpDeleted(interp)) {
 	if (result != TCL_ERROR) {
 	    Tcl_ResetResult(interp);
-	    Tcl_SetResult(interp,
-		    "unknown subcommand handler returned bad code: ",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unknown subcommand handler returned bad code: ", -1));
 	    switch (result) {
 	    case TCL_RETURN:
-		Tcl_AppendResult(interp, "return", NULL);
+		Tcl_AppendToObj(Tcl_GetObjResult(interp), "return", -1);
 		break;
 	    case TCL_BREAK:
-		Tcl_AppendResult(interp, "break", NULL);
+		Tcl_AppendToObj(Tcl_GetObjResult(interp), "break", -1);
 		break;
 	    case TCL_CONTINUE:
-		Tcl_AppendResult(interp, "continue", NULL);
+		Tcl_AppendToObj(Tcl_GetObjResult(interp), "continue", -1);
 		break;
 	    default:
-		sprintf(buf, "%d", result);
-		Tcl_AppendResult(interp, buf, NULL);
+		Tcl_AppendPrintfToObj(Tcl_GetObjResult(interp), "%d", result);
 	    }
 	    Tcl_AddErrorInfo(interp, "\n    result of "
 		    "ensemble unknown subcommand handler: ");
 	    Tcl_AddErrorInfo(interp, TclGetString(unknownCmd));
+	    Tcl_SetErrorCode(interp, "TCL", "ENSEMBLE", "UNKNOWN_RESULT",
+		    NULL);
 	} else {
 	    Tcl_AddErrorInfo(interp,
 		    "\n    (ensemble unknown subcommand handler)");
@@ -2392,7 +2437,7 @@ BuildEnsembleConfig(
 	     * the programmer's responsibility (or [::unknown] of course).
 	     */
 
-	    cmdObj = Tcl_NewStringObj(ensemblePtr->nsPtr->fullName, -1);
+	    cmdObj = NewNsObj((Tcl_Namespace *) ensemblePtr->nsPtr);
 	    if (ensemblePtr->nsPtr->parentPtr != NULL) {
 		Tcl_AppendStringsToObj(cmdObj, "::", name, NULL);
 	    } else {
diff --git a/generic/tclExecute.c b/generic/tclExecute.c
index e402634..3c0b472 100644
--- a/generic/tclExecute.c
+++ b/generic/tclExecute.c
@@ -4896,8 +4896,8 @@ TEBCresume(
 
 	    case INST_RSHIFT:
 		if (l2 < 0) {
-		    Tcl_SetResult(interp, "negative shift argument",
-			    TCL_STATIC);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "negative shift argument", -1));
 #if 0
 		    DECACHE_STACK_INFO();
 		    Tcl_SetErrorCode(interp, "ARITH", "DOMAIN",
@@ -4944,8 +4944,8 @@ TEBCresume(
 
 	    case INST_LSHIFT:
 		if (l2 < 0) {
-		    Tcl_SetResult(interp, "negative shift argument",
-			    TCL_STATIC);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "negative shift argument", -1));
 #if 0
 		    DECACHE_STACK_INFO();
 		    Tcl_SetErrorCode(interp, "ARITH", "DOMAIN",
@@ -4967,9 +4967,8 @@ TEBCresume(
 		     * good place to draw the line.
 		     */
 
-		    Tcl_SetResult(interp,
-			    "integer value too large to represent",
-			    TCL_STATIC);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "integer value too large to represent", -1));
 #if 0
 		    DECACHE_STACK_INFO();
 		    Tcl_SetErrorCode(interp, "ARITH", "IOVERFLOW",
@@ -5671,9 +5670,9 @@ TEBCresume(
 		NEXT_INST_V(5, opnd+1, 1);
 	    }
 	    DECACHE_STACK_INFO();
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "key \"", TclGetString(OBJ_AT_TOS),
-		    "\" not known in dictionary", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "key \"%s\" not known in dictionary",
+		    TclGetString(OBJ_AT_TOS)));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "DICT",
 		    TclGetString(OBJ_AT_TOS), NULL);
 	    CACHE_STACK_INFO();
@@ -6304,7 +6303,7 @@ TEBCresume(
 
     divideByZero:
 	DECACHE_STACK_INFO();
-	Tcl_SetResult(interp, "divide by zero", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj("divide by zero", -1));
 	Tcl_SetErrorCode(interp, "ARITH", "DIVZERO", "divide by zero", NULL);
 	CACHE_STACK_INFO();
 	goto gotError;
@@ -6316,8 +6315,8 @@ TEBCresume(
 
     exponOfZero:
 	DECACHE_STACK_INFO();
-	Tcl_SetResult(interp, "exponentiation of zero by negative power",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"exponentiation of zero by negative power", -1));
 	Tcl_SetErrorCode(interp, "ARITH", "DOMAIN",
 		"exponentiation of zero by negative power", NULL);
 	CACHE_STACK_INFO();
@@ -6693,7 +6692,8 @@ ExecuteExtendedBinaryMathOp(
 	    invalid = 0;
 	}
 	if (invalid) {
-	    Tcl_SetResult(interp, "negative shift argument", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "negative shift argument", -1));
 	    return GENERAL_ARITHMETIC_ERROR;
 	}
 
@@ -6723,8 +6723,8 @@ ExecuteExtendedBinaryMathOp(
 		 * place to draw the line.
 		 */
 
-		Tcl_SetResult(interp, "integer value too large to represent",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"integer value too large to represent", -1));
 		return GENERAL_ARITHMETIC_ERROR;
 	    }
 	    shift = (int)(*((const long *)ptr2));
@@ -7125,7 +7125,8 @@ ExecuteExtendedBinaryMathOp(
 	 */
 
 	if (type2 != TCL_NUMBER_LONG) {
-	    Tcl_SetResult(interp, "exponent too large", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "exponent too large", -1));
 	    return GENERAL_ARITHMETIC_ERROR;
 	}
 
@@ -7363,7 +7364,8 @@ ExecuteExtendedBinaryMathOp(
 	Tcl_TakeBignumFromObj(NULL, value2Ptr, &big2);
 	if (big2.used > 1) {
 	    mp_clear(&big2);
-	    Tcl_SetResult(interp, "exponent too large", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "exponent too large", -1));
 	    return GENERAL_ARITHMETIC_ERROR;
 	}
 	Tcl_TakeBignumFromObj(NULL, valuePtr, &big1);
diff --git a/generic/tclFileName.c b/generic/tclFileName.c
index edb6581..5d90351 100644
--- a/generic/tclFileName.c
+++ b/generic/tclFileName.c
@@ -1174,9 +1174,10 @@ DoTildeSubst(
 	dir = TclGetEnv("HOME", &dirString);
 	if (dir == NULL) {
 	    if (interp) {
-		Tcl_ResetResult(interp);
-		Tcl_AppendResult(interp, "couldn't find HOME environment "
-			"variable to expand path", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"couldn't find HOME environment "
+			"variable to expand path", -1));
+		Tcl_SetErrorCode(interp, "TCL", "FILENAME", "NO_HOME", NULL);
 	    }
 	    return NULL;
 	}
@@ -1185,8 +1186,9 @@ DoTildeSubst(
     } else if (TclpGetUserHome(user, resultPtr) == NULL) {
 	if (interp) {
 	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "user \"", user, "\" doesn't exist",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "user \"%s\" doesn't exist", user));
+	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "USER", user, NULL);
 	}
 	return NULL;
     }
@@ -1329,9 +1331,9 @@ Tcl_GlobObjCmd(
 
   endOfForLoop:
     if ((globFlags & TCL_GLOBMODE_TAILS) && (pathOrDir == NULL)) {
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"\"-tails\" must be used with either "
-		"\"-directory\" or \"-path\"", NULL);
+		"\"-directory\" or \"-path\"", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "GLOB",
 		"BADOPTIONCOMBINATION", NULL);
 	return TCL_ERROR;
@@ -1625,20 +1627,23 @@ Tcl_GlobObjCmd(
 	}
 
 	if (length == 0) {
-	    Tcl_AppendResult(interp, "no files matched glob pattern",
-		    (join || (objc == 1)) ? " \"" : "s \"", NULL);
+	    Tcl_Obj *errorMsg =
+		    Tcl_ObjPrintf("no files matched glob pattern%s \"",
+			    (join || (objc == 1)) ? "" : "s");
+
 	    if (join) {
-		Tcl_AppendResult(interp, Tcl_DStringValue(&prefix), NULL);
+		Tcl_AppendToObj(errorMsg, Tcl_DStringValue(&prefix), -1);
 	    } else {
 		const char *sep = "";
 
 		for (i = 0; i < objc; i++) {
-		    string = Tcl_GetString(objv[i]);
-		    Tcl_AppendResult(interp, sep, string, NULL);
+		    Tcl_AppendPrintfToObj(errorMsg, "%s%s",
+			    sep, Tcl_GetString(objv[i]));
 		    sep = " ";
 		}
 	    }
-	    Tcl_AppendResult(interp, "\"", NULL);
+	    Tcl_AppendToObj(errorMsg, "\"", -1);
+	    Tcl_SetObjResult(interp, errorMsg);
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "GLOB", "NOMATCH",
 		    NULL);
 	    result = TCL_ERROR;
@@ -2206,15 +2211,15 @@ DoGlob(
 		closeBrace = p;
 		break;
 	    }
-	    Tcl_SetResult(interp, "unmatched open-brace in file name",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unmatched open-brace in file name", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "GLOB", "BALANCE",
 		    NULL);
 	    return TCL_ERROR;
 
 	} else if (*p == '}') {
-	    Tcl_SetResult(interp, "unmatched close-brace in file name",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unmatched close-brace in file name", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "GLOB", "BALANCE",
 		    NULL);
 	    return TCL_ERROR;
diff --git a/generic/tclIORChan.c b/generic/tclIORChan.c
index 6fec40a..eeb11f9 100644
--- a/generic/tclIORChan.c
+++ b/generic/tclIORChan.c
@@ -739,7 +739,8 @@ TclChanCreateObjCmd(
      * Return handle as result of command.
      */
 
-    Tcl_SetResult(interp, (char *)chanPtr->state->channelName, TCL_VOLATILE);
+    Tcl_SetObjResult(interp,
+            Tcl_NewStringObj(chanPtr->state->channelName, -1));
     return TCL_OK;
 
   error:
diff --git a/generic/tclIOUtil.c b/generic/tclIOUtil.c
index 41a5aac..ebf34dc 100644
--- a/generic/tclIOUtil.c
+++ b/generic/tclIOUtil.c
@@ -1094,8 +1094,9 @@ Tcl_FSMatchInDirectory(
     cwd = Tcl_FSGetCwd(NULL);
     if (cwd == NULL) {
 	if (interp != NULL) {
-	    Tcl_SetResult(interp, "glob couldn't determine "
-		    "the current working directory", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "glob couldn't determine the current working directory",
+		    -1));
 	}
 	return TCL_ERROR;
     }
diff --git a/generic/tclLoad.c b/generic/tclLoad.c
index ce4d6a4..f14cec0 100644
--- a/generic/tclLoad.c
+++ b/generic/tclLoad.c
@@ -157,9 +157,8 @@ Tcl_LoadObjCmd(
 	}
     }
     if ((fullFileName[0] == 0) && (packageName == NULL)) {
-	Tcl_SetResult(interp,
-		"must specify either file name or package name",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"must specify either file name or package name", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "LOAD", "NOLIBRARY",
 		NULL);
 	code = TCL_ERROR;
@@ -581,9 +580,8 @@ Tcl_UnloadObjCmd(
 	}
     }
     if ((fullFileName[0] == 0) && (packageName == NULL)) {
-	Tcl_SetResult(interp,
-		"must specify either file name or package name",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"must specify either file name or package name", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "UNLOAD", "NOLIBRARY",
 		NULL);
 	code = TCL_ERROR;
diff --git a/generic/tclLoadNone.c b/generic/tclLoadNone.c
index ac094e6..6b48aee 100644
--- a/generic/tclLoadNone.c
+++ b/generic/tclLoadNone.c
@@ -44,9 +44,9 @@ TclpDlopen(
 				 * function which should be used for this
 				 * file. */
 {
-    Tcl_SetResult(interp,
+    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 	    "dynamic loading is not currently available on this system",
-	    TCL_STATIC);
+	    -1));
     return TCL_ERROR;
 }
 
diff --git a/generic/tclOO.c b/generic/tclOO.c
index df7d49d..d9f5d60 100644
--- a/generic/tclOO.c
+++ b/generic/tclOO.c
@@ -1582,8 +1582,9 @@ Tcl_NewObjectInstance(
 
     if (nameStr && Tcl_FindCommand(interp, nameStr, NULL,
 	    TCL_NAMESPACE_ONLY)) {
-	Tcl_AppendResult(interp, "can't create object \"", nameStr,
-		"\": command already exists with that name", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't create object \"%s\": command already exists with"
+		" that name", nameStr));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "OVERWRITE_OBJECT", NULL);
 	return NULL;
     }
@@ -1649,8 +1650,8 @@ Tcl_NewObjectInstance(
 	     */
 
 	    if (result != TCL_ERROR && Deleted(oPtr)) {
-		Tcl_SetResult(interp, "object deleted in constructor",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"object deleted in constructor", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OO", "STILLBORN", NULL);
 		result = TCL_ERROR;
 	    }
@@ -1705,8 +1706,9 @@ TclNRNewObjectInstance(
 
     if (nameStr && Tcl_FindCommand(interp, nameStr, NULL,
 	    TCL_NAMESPACE_ONLY)) {
-	Tcl_AppendResult(interp, "can't create object \"", nameStr,
-		"\": command already exists with that name", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"can't create object \"%s\": command already exists with"
+		" that name", nameStr));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "OVERWRITE_OBJECT", NULL);
 	return TCL_ERROR;
     }
@@ -1794,7 +1796,8 @@ FinalizeAlloc(
      */
 
     if (result != TCL_ERROR && Deleted(oPtr)) {
-	Tcl_SetResult(interp, "object deleted in constructor", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"object deleted in constructor", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "STILLBORN", NULL);
 	result = TCL_ERROR;
     }
@@ -1851,7 +1854,8 @@ Tcl_CopyObjectInstance(
      */
 
     if (IsRootClass(oPtr)) {
-	Tcl_AppendResult(interp, "may not clone the class of classes", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"may not clone the class of classes", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "CLONING_CLASS", NULL);
 	return NULL;
     }
@@ -2514,9 +2518,9 @@ TclOOObjectCmdCore(
 		flags | (oPtr->flags & FILTER_HANDLING), methodNamePtr);
 	TclDecrRefCount(mappedMethodName);
 	if (contextPtr == NULL) {
-	    Tcl_AppendResult(interp, "impossible to invoke method \"",
-		    TclGetString(methodNamePtr),
-		    "\": no defined method or unknown method", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "impossible to invoke method \"%s\": no defined method or"
+		    " unknown method", TclGetString(methodNamePtr)));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD_MAPPED",
 		    TclGetString(methodNamePtr), NULL);
 	    return TCL_ERROR;
@@ -2530,9 +2534,9 @@ TclOOObjectCmdCore(
 	contextPtr = TclOOGetCallContext(oPtr, methodNamePtr,
 		flags | (oPtr->flags & FILTER_HANDLING), NULL);
 	if (contextPtr == NULL) {
-	    Tcl_AppendResult(interp, "impossible to invoke method \"",
-		    TclGetString(methodNamePtr),
-		    "\": no defined method or unknown method", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "impossible to invoke method \"%s\": no defined method or"
+		    " unknown method", TclGetString(methodNamePtr)));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		    TclGetString(methodNamePtr), NULL);
 	    return TCL_ERROR;
@@ -2558,8 +2562,8 @@ TclOOObjectCmdCore(
 	    }
 	}
 	if (contextPtr->index >= contextPtr->callPtr->numChain) {
-	    Tcl_SetResult(interp, "no valid method implementation",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "no valid method implementation", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		    TclGetString(methodNamePtr), NULL);
 	    TclOODeleteContext(contextPtr);
@@ -2640,8 +2644,8 @@ Tcl_ObjectContextInvokeNext(
 	    methodType = "method";
 	}
 
-	Tcl_AppendResult(interp, "no next ", methodType, " implementation",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"no next %s implementation", methodType));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "NOTHING_NEXT", NULL);
 	return TCL_ERROR;
     }
@@ -2709,8 +2713,8 @@ TclNRObjectContextInvokeNext(
 	    methodType = "method";
 	}
 
-	Tcl_AppendResult(interp, "no next ", methodType, " implementation",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"no next %s implementation", methodType));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "NOTHING_NEXT", NULL);
 	return TCL_ERROR;
     }
@@ -2787,8 +2791,8 @@ Tcl_GetObjectFromObj(
     return cmdPtr->objClientData;
 
   notAnObject:
-    Tcl_AppendResult(interp, TclGetString(objPtr),
-	    " does not refer to an object", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "%s does not refer to an object", TclGetString(objPtr)));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "OBJECT", TclGetString(objPtr),
 	    NULL);
     return NULL;
diff --git a/generic/tclOOBasic.c b/generic/tclOOBasic.c
index 35ad1eb..3637ede 100644
--- a/generic/tclOOBasic.c
+++ b/generic/tclOOBasic.c
@@ -168,8 +168,8 @@ TclOO_Class_Create(
     if (oPtr->classPtr == NULL) {
 	Tcl_Obj *cmdnameObj = TclOOObjectName(interp, oPtr);
 
-	Tcl_AppendResult(interp, "object \"", TclGetString(cmdnameObj),
-		"\" is not a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"object \"%s\" is not a class", TclGetString(cmdnameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "INSTANTIATE_NONCLASS", NULL);
 	return TCL_ERROR;
     }
@@ -186,7 +186,8 @@ TclOO_Class_Create(
     objName = Tcl_GetStringFromObj(
 	    objv[Tcl_ObjectContextSkippedArgs(context)], &len);
     if (len == 0) {
-	Tcl_AppendResult(interp, "object name must not be empty", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"object name must not be empty", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "EMPTY_NAME", NULL);
 	return TCL_ERROR;
     }
@@ -232,8 +233,8 @@ TclOO_Class_CreateNs(
     if (oPtr->classPtr == NULL) {
 	Tcl_Obj *cmdnameObj = TclOOObjectName(interp, oPtr);
 
-	Tcl_AppendResult(interp, "object \"", TclGetString(cmdnameObj),
-		"\" is not a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"object \"%s\" is not a class", TclGetString(cmdnameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "INSTANTIATE_NONCLASS", NULL);
 	return TCL_ERROR;
     }
@@ -250,14 +251,16 @@ TclOO_Class_CreateNs(
     objName = Tcl_GetStringFromObj(
 	    objv[Tcl_ObjectContextSkippedArgs(context)], &len);
     if (len == 0) {
-	Tcl_AppendResult(interp, "object name must not be empty", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"object name must not be empty", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "EMPTY_NAME", NULL);
 	return TCL_ERROR;
     }
     nsName = Tcl_GetStringFromObj(
 	    objv[Tcl_ObjectContextSkippedArgs(context)+1], &len);
     if (len == 0) {
-	Tcl_AppendResult(interp, "namespace name must not be empty", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"namespace name must not be empty", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "EMPTY_NAME", NULL);
 	return TCL_ERROR;
     }
@@ -301,8 +304,8 @@ TclOO_Class_New(
     if (oPtr->classPtr == NULL) {
 	Tcl_Obj *cmdnameObj = TclOOObjectName(interp, oPtr);
 
-	Tcl_AppendResult(interp, "object \"", TclGetString(cmdnameObj),
-		"\" is not a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"object \"%s\" is not a class", TclGetString(cmdnameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "INSTANTIATE_NONCLASS", NULL);
 	return TCL_ERROR;
     }
@@ -504,6 +507,7 @@ TclOO_Object_Unknown(
     Object *oPtr = contextPtr->oPtr;
     const char **methodNames;
     int numMethodNames, i, skip = Tcl_ObjectContextSkippedArgs(context);
+    Tcl_Obj *errorMsg;
 
     /*
      * If no method name, generate an error asking for a method name. (Only by
@@ -529,31 +533,34 @@ TclOO_Object_Unknown(
 
     if (numMethodNames == 0) {
 	Tcl_Obj *tmpBuf = TclOOObjectName(interp, oPtr);
+	const char *piece;
 
-	Tcl_AppendResult(interp, "object \"", TclGetString(tmpBuf), NULL);
 	if (contextPtr->callPtr->flags & PUBLIC_METHOD) {
-	    Tcl_AppendResult(interp, "\" has no visible methods", NULL);
+	    piece = "visible methods";
 	} else {
-	    Tcl_AppendResult(interp, "\" has no methods", NULL);
+	    piece = "methods";
 	}
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"object \"%s\" has no %s", TclGetString(tmpBuf), piece));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[skip]), NULL);
 	return TCL_ERROR;
     }
 
-    Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[skip]),
-	    "\": must be ", NULL);
+    errorMsg = Tcl_ObjPrintf("unknown method \"%s\": must be ",
+	    TclGetString(objv[skip]));
     for (i=0 ; i<numMethodNames-1 ; i++) {
 	if (i) {
-	    Tcl_AppendResult(interp, ", ", NULL);
+	    Tcl_AppendToObj(errorMsg, ", ", -1);
 	}
-	Tcl_AppendResult(interp, methodNames[i], NULL);
+	Tcl_AppendToObj(errorMsg, methodNames[i], -1);
     }
     if (i) {
-	Tcl_AppendResult(interp, " or ", NULL);
+	Tcl_AppendToObj(errorMsg, " or ", -1);
     }
-    Tcl_AppendResult(interp, methodNames[i], NULL);
+    Tcl_AppendToObj(errorMsg, methodNames[i], -1);
     ckfree(methodNames);
+    Tcl_SetObjResult(interp, errorMsg);
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 	    TclGetString(objv[skip]), NULL);
     return TCL_ERROR;
@@ -609,8 +616,9 @@ TclOO_Object_LinkVar(
 	 */
 
 	if (strstr(varName, "::") != NULL) {
-	    Tcl_AppendResult(interp, "variable name \"", varName,
-		    "\" illegal: must not contain namespace separator", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "variable name \"%s\" illegal: must not contain namespace"
+		    " separator", varName));
 	    Tcl_SetErrorCode(interp, "TCL", "UPVAR", "INVERTED", NULL);
 	    return TCL_ERROR;
 	}
@@ -784,8 +792,9 @@ TclOONextObjCmd(
      */
 
     if (framePtr == NULL || !(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
-	Tcl_AppendResult(interp, TclGetString(objv[0]),
-		" may only be called from inside a method", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"%s may only be called from inside a method",
+		TclGetString(objv[0])));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
 	return TCL_ERROR;
     }
@@ -822,8 +831,9 @@ TclOONextToObjCmd(
      */
 
     if (framePtr == NULL || !(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
-	Tcl_AppendResult(interp, TclGetString(objv[0]),
-		" may only be called from inside a method", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"%s may only be called from inside a method",
+		TclGetString(objv[0])));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
 	return TCL_ERROR;
     }
@@ -843,8 +853,9 @@ TclOONextToObjCmd(
     }
     classPtr = ((Object *)object)->classPtr;
     if (classPtr == NULL) {
-	Tcl_AppendResult(interp, "\"", TclGetString(objv[1]),
-		"\" is not a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" is not a class", TclGetString(objv[1])));
+	Tcl_SetErrorCode(interp, "TCL", "OO", "CLASS_REQUIRED", NULL);
 	return TCL_ERROR;
     }
 
@@ -881,14 +892,15 @@ TclOONextToObjCmd(
 	struct MInvoke *miPtr = contextPtr->callPtr->chain + i;
 
 	if (!miPtr->isFilter && miPtr->mPtr->declaringClassPtr == classPtr) {
-	    Tcl_AppendResult(interp, "method implementation by \"",
-		    TclGetString(objv[1]), "\" not reachable from here",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "method implementation by \"%s\" not reachable from here",
+		    TclGetString(objv[1])));
 	    return TCL_ERROR;
 	}
     }
-    Tcl_AppendResult(interp, "method has no non-filter implementation by \"",
-	    TclGetString(objv[1]), "\"", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "method has no non-filter implementation by \"%s\"",
+	    TclGetString(objv[1])));
     return TCL_ERROR;
 }
 
@@ -948,8 +960,9 @@ TclOOSelfObjCmd(
      */
 
     if (framePtr == NULL || !(framePtr->isProcCallFrame & FRAME_IS_METHOD)) {
-	Tcl_AppendResult(interp, TclGetString(objv[0]),
-		" may only be called from inside a method", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"%s may only be called from inside a method",
+		TclGetString(objv[0])));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
 	return TCL_ERROR;
     }
@@ -983,7 +996,8 @@ TclOOSelfObjCmd(
 	Class *clsPtr = CurrentlyInvoked(contextPtr).mPtr->declaringClassPtr;
 
 	if (clsPtr == NULL) {
-	    Tcl_AppendResult(interp, "method not defined by a class", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "method not defined by a class", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "UNMATCHED_CONTEXT", NULL);
 	    return TCL_ERROR;
 	}
@@ -1003,7 +1017,8 @@ TclOOSelfObjCmd(
 	return TCL_OK;
     case SELF_FILTER:
 	if (!CurrentlyInvoked(contextPtr).isFilter) {
-	    Tcl_AppendResult(interp, "not inside a filtering context", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "not inside a filtering context", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "UNMATCHED_CONTEXT", NULL);
 	    return TCL_ERROR;
 	} else {
@@ -1028,7 +1043,8 @@ TclOOSelfObjCmd(
     case SELF_CALLER:
 	if ((framePtr->callerVarPtr == NULL) ||
 		!(framePtr->callerVarPtr->isProcCallFrame & FRAME_IS_METHOD)){
-	    Tcl_AppendResult(interp, "caller is not an object", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "caller is not an object", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "CONTEXT_REQUIRED", NULL);
 	    return TCL_ERROR;
 	} else {
@@ -1045,7 +1061,8 @@ TclOOSelfObjCmd(
 		 * This should be unreachable code.
 		 */
 
-		Tcl_AppendResult(interp, "method without declarer!", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"method without declarer!", -1));
 		return TCL_ERROR;
 	    }
 
@@ -1076,7 +1093,8 @@ TclOOSelfObjCmd(
 		 * This should be unreachable code.
 		 */
 
-		Tcl_AppendResult(interp, "method without declarer!", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"method without declarer!", -1));
 		return TCL_ERROR;
 	    }
 
@@ -1093,7 +1111,8 @@ TclOOSelfObjCmd(
 	return TCL_OK;
     case SELF_TARGET:
 	if (!CurrentlyInvoked(contextPtr).isFilter) {
-	    Tcl_AppendResult(interp, "not inside a filtering context", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "not inside a filtering context", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "UNMATCHED_CONTEXT", NULL);
 	    return TCL_ERROR;
 	} else {
@@ -1119,7 +1138,8 @@ TclOOSelfObjCmd(
 		 * This should be unreachable code.
 		 */
 
-		Tcl_AppendResult(interp, "method without declarer!", NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"method without declarer!", -1));
 		return TCL_ERROR;
 	    }
 	    result[0] = TclOOObjectName(interp, declarerPtr);
diff --git a/generic/tclOODefineCmds.c b/generic/tclOODefineCmds.c
index 69cffb0..c022e6b 100644
--- a/generic/tclOODefineCmds.c
+++ b/generic/tclOODefineCmds.c
@@ -423,8 +423,8 @@ RenameDeleteMethod(
     if (!useClass) {
 	if (!oPtr->methodsPtr) {
 	noSuchMethod:
-	    Tcl_AppendResult(interp, "method ", TclGetString(fromPtr),
-		    " does not exist", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "method %s does not exist", TclGetString(fromPtr)));
 	    Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		    TclGetString(fromPtr), NULL);
 	    return TCL_ERROR;
@@ -438,14 +438,15 @@ RenameDeleteMethod(
 		    &isNew);
 	    if (hPtr == newHPtr) {
 	    renameToSelf:
-		Tcl_AppendResult(interp, "cannot rename method to itself",
-			NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"cannot rename method to itself", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OO", "RENAME_TO_SELF", NULL);
 		return TCL_ERROR;
 	    } else if (!isNew) {
 	    renameToExisting:
-		Tcl_AppendResult(interp, "method called ",
-			TclGetString(toPtr), " already exists", NULL);
+		Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+			"method called %s already exists",
+			TclGetString(toPtr)));
 		Tcl_SetErrorCode(interp, "TCL", "OO", "RENAME_OVER", NULL);
 		return TCL_ERROR;
 	    }
@@ -513,7 +514,8 @@ TclOOUnknownDefinition(
     const char *soughtStr, *matchedStr = NULL;
 
     if (objc < 2) {
-	Tcl_AppendResult(interp, "bad call of unknown handler", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"bad call of unknown handler", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_UNKNOWN", NULL);
 	return TCL_ERROR;
     }
@@ -558,7 +560,8 @@ TclOOUnknownDefinition(
     }
 
   noMatch:
-    Tcl_AppendResult(interp, "invalid command name \"",soughtStr,"\"", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "invalid command name \"%s\"", soughtStr));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "COMMAND", soughtStr, NULL);
     return TCL_ERROR;
 }
@@ -646,9 +649,9 @@ InitDefineContext(
     int result;
 
     if (namespacePtr == NULL) {
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"cannot process definitions; support namespace deleted",
-		NULL);
+		-1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -686,16 +689,17 @@ TclOOGetDefineCmdContext(
 
     if ((iPtr->varFramePtr == NULL)
 	    || (iPtr->varFramePtr->isProcCallFrame != FRAME_IS_OO_DEFINE)) {
-	Tcl_AppendResult(interp, "this command may only be called from within"
-		" the context of an ::oo::define or ::oo::objdefine command",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"this command may only be called from within the context of"
+		" an ::oo::define or ::oo::objdefine command", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return NULL;
     }
     object = iPtr->varFramePtr->clientData;
     if (Tcl_ObjectDeleted(object)) {
-	Tcl_AppendResult(interp, "this command cannot be called when the "
-		"object has been deleted", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"this command cannot be called when the object has been"
+		" deleted", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return NULL;
     }
@@ -736,7 +740,7 @@ GetClassInOuterContext(
 	return NULL;
     }
     if (oPtr->classPtr == NULL) {
-	Tcl_AppendResult(interp, errMsg, NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(errMsg, -1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CLASS",
 		TclGetString(className), NULL);
 	return NULL;
@@ -816,8 +820,8 @@ TclOODefineObjCmd(
 	return TCL_ERROR;
     }
     if (oPtr->classPtr == NULL) {
-	Tcl_AppendResult(interp, TclGetString(objv[1]),
-		" does not refer to a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"%s does not refer to a class",TclGetString(objv[1])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CLASS",
 		TclGetString(objv[1]), NULL);
 	return TCL_ERROR;
@@ -1161,14 +1165,14 @@ TclOODefineClassObjCmd(
 	return TCL_ERROR;
     }
     if (oPtr->flags & ROOT_OBJECT) {
-	Tcl_AppendResult(interp,
-		"may not modify the class of the root object class", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"may not modify the class of the root object class", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
     if (oPtr->flags & ROOT_CLASS) {
-	Tcl_AppendResult(interp,
-		"may not modify the class of the class of classes", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"may not modify the class of the class of classes", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1194,9 +1198,10 @@ TclOODefineClassObjCmd(
      */
 
     if ((oPtr->classPtr==NULL) == TclOOIsReachable(fPtr->classCls, clsPtr)) {
-	Tcl_AppendResult(interp, "may not change a ",
-		(oPtr->classPtr==NULL ? "non-" : ""), "class object into a ",
-		(oPtr->classPtr==NULL ? "" : "non-"), "class object", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"may not change a %sclass object into a %sclass object",
+		(oPtr->classPtr==NULL ? "non-" : ""),
+		(oPtr->classPtr==NULL ? "" : "non-")));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "TRANSMUTATION", NULL);
 	return TCL_ERROR;
     }
@@ -1317,7 +1322,8 @@ TclOODefineDeleteMethodObjCmd(
 	return TCL_ERROR;
     }
     if (!isInstanceDeleteMethod && !oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1440,7 +1446,8 @@ TclOODefineExportObjCmd(
     }
     clsPtr = oPtr->classPtr;
     if (!isInstanceExport && !clsPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1531,7 +1538,8 @@ TclOODefineForwardObjCmd(
 	return TCL_ERROR;
     }
     if (!isInstanceForward && !oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1588,7 +1596,8 @@ TclOODefineMethodObjCmd(
 	return TCL_ERROR;
     }
     if (!isInstanceMethod && !oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1639,7 +1648,8 @@ TclOODefineMixinObjCmd(
 	return TCL_ERROR;
     }
     if (!isInstanceMixin && !oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1653,7 +1663,8 @@ TclOODefineMixinObjCmd(
 	    goto freeAndError;
 	}
 	if (!isInstanceMixin && TclOOIsReachable(oPtr->classPtr, clsPtr)) {
-	    Tcl_AppendResult(interp, "may not mix a class into itself", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "may not mix a class into itself", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "SELF_MIXIN", NULL);
 	    goto freeAndError;
 	}
@@ -1704,7 +1715,8 @@ TclOODefineRenameMethodObjCmd(
 	return TCL_ERROR;
     }
     if (!isInstanceRenameMethod && !oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1764,7 +1776,8 @@ TclOODefineUnexportObjCmd(
     }
     clsPtr = oPtr->classPtr;
     if (!isInstanceUnexport && !clsPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1949,7 +1962,8 @@ ClassFilterGet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -1984,7 +1998,8 @@ ClassFilterSet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     } else if (Tcl_ListObjGetElements(interp, objv[0], &filterc,
@@ -2027,7 +2042,8 @@ ClassMixinGet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -2065,7 +2081,8 @@ ClassMixinSet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     } else if (Tcl_ListObjGetElements(interp, objv[0], &mixinc,
@@ -2082,7 +2099,8 @@ ClassMixinSet(
 	    goto freeAndError;
 	}
 	if (TclOOIsReachable(oPtr->classPtr, mixins[i])) {
-	    Tcl_AppendResult(interp, "may not mix a class into itself", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "may not mix a class into itself", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "SELF_MIXIN", NULL);
 	    goto freeAndError;
 	}
@@ -2128,7 +2146,8 @@ ClassSuperGet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -2165,12 +2184,13 @@ ClassSuperSet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     } else if (oPtr == oPtr->fPtr->objectCls->thisPtr) {
-	Tcl_AppendResult(interp,
-		"may not modify the superclass of the root object", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"may not modify the superclass of the root object", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     } else if (Tcl_ListObjGetElements(interp, objv[0], &superc,
@@ -2196,15 +2216,15 @@ ClassSuperSet(
 	}
 	for (j=0 ; j<i ; j++) {
 	    if (superclasses[j] == superclasses[i]) {
-		Tcl_AppendResult(interp,
-			"class should only be a direct superclass once",NULL);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"class should only be a direct superclass once", -1));
 		Tcl_SetErrorCode(interp, "TCL", "OO", "REPETITIOUS", NULL);
 		goto failedAfterAlloc;
 	    }
 	}
 	if (TclOOIsReachable(oPtr->classPtr, superclasses[i])) {
-	    Tcl_AppendResult(interp,
-		    "attempt to form circular dependency graph", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "attempt to form circular dependency graph", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "CIRCULARITY", NULL);
 	failedAfterAlloc:
 	    ckfree((char *) superclasses);
@@ -2265,7 +2285,8 @@ ClassVarsGet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     }
@@ -2301,7 +2322,8 @@ ClassVarsSet(
     if (oPtr == NULL) {
 	return TCL_ERROR;
     } else if (!oPtr->classPtr) {
-	Tcl_AppendResult(interp, "attempt to misuse API", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"attempt to misuse API", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "MONKEY_BUSINESS", NULL);
 	return TCL_ERROR;
     } else if (Tcl_ListObjGetElements(interp, objv[0], &varc,
@@ -2313,15 +2335,16 @@ ClassVarsSet(
 	const char *varName = Tcl_GetString(varv[i]);
 
 	if (strstr(varName, "::") != NULL) {
-	    Tcl_AppendResult(interp, "invalid declared variable name \"",
-		    varName, "\": must not contain namespace separators",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "invalid declared variable name \"%s\": must not %s",
+		    varName, "contain namespace separators"));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_DECLVAR", NULL);
 	    return TCL_ERROR;
 	}
 	if (Tcl_StringMatch(varName, "*(*)")) {
-	    Tcl_AppendResult(interp, "invalid declared variable name \"",
-		    varName, "\": must not refer to an array element", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "invalid declared variable name \"%s\": must not %s",
+		    varName, "refer to an array element"));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_DECLVAR", NULL);
 	    return TCL_ERROR;
 	}
@@ -2591,15 +2614,16 @@ ObjVarsSet(
 	const char *varName = Tcl_GetString(varv[i]);
 
 	if (strstr(varName, "::") != NULL) {
-	    Tcl_AppendResult(interp, "invalid declared variable name \"",
-		    varName, "\": must not contain namespace separators",
-		    NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "invalid declared variable name \"%s\": must not %s",
+		    varName, "contain namespace separators"));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_DECLVAR", NULL);
 	    return TCL_ERROR;
 	}
 	if (Tcl_StringMatch(varName, "*(*)")) {
-	    Tcl_AppendResult(interp, "invalid declared variable name \"",
-		    varName, "\": must not refer to an array element", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "invalid declared variable name \"%s\": must not %s",
+		    varName, "refer to an array element"));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_DECLVAR", NULL);
 	    return TCL_ERROR;
 	}
diff --git a/generic/tclOOInfo.c b/generic/tclOOInfo.c
index f298320..796442b 100644
--- a/generic/tclOOInfo.c
+++ b/generic/tclOOInfo.c
@@ -177,8 +177,8 @@ GetClassFromObj(
 	return NULL;
     }
     if (oPtr->classPtr == NULL) {
-	Tcl_AppendResult(interp, "\"", TclGetString(objPtr),
-		"\" is not a class", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" is not a class", TclGetString(objPtr)));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "CLASS",
 		TclGetString(objPtr), NULL);
 	return NULL;
@@ -279,16 +279,16 @@ InfoObjectDefnCmd(
     hPtr = Tcl_FindHashEntry(oPtr->methodsPtr, (char *) objv[2]);
     if (hPtr == NULL) {
     unknownMethod:
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
     }
     procPtr = TclOOGetProcFromMethod(Tcl_GetHashValue(hPtr));
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp,
-		"definition not available for this kind of method", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"definition not available for this kind of method", -1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -390,17 +390,17 @@ InfoObjectForwardCmd(
     hPtr = Tcl_FindHashEntry(oPtr->methodsPtr, (char *) objv[2]);
     if (hPtr == NULL) {
     unknownMethod:
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
     }
     prefixObj = TclOOGetFwdFromMethod(Tcl_GetHashValue(hPtr));
     if (prefixObj == NULL) {
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"prefix argument list not available for this kind of method",
-		NULL);
+		-1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -491,7 +491,8 @@ InfoObjectIsACmd(
 	    return TCL_ERROR;
 	}
 	if (o2Ptr->classPtr == NULL) {
-	    Tcl_AppendResult(interp, "non-classes cannot be mixins", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "non-classes cannot be mixins", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "NONCLASS", NULL);
 	    return TCL_ERROR;
 	} else {
@@ -516,7 +517,8 @@ InfoObjectIsACmd(
 	    return TCL_ERROR;
 	}
 	if (o2Ptr->classPtr == NULL) {
-	    Tcl_AppendResult(interp, "non-classes cannot be types", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "non-classes cannot be types", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OO", "NONCLASS", NULL);
 	    return TCL_ERROR;
 	}
@@ -651,8 +653,8 @@ InfoObjectMethodTypeCmd(
     hPtr = Tcl_FindHashEntry(oPtr->methodsPtr, (char *) objv[2]);
     if (hPtr == NULL) {
     unknownMethod:
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -878,8 +880,8 @@ InfoClassConstrCmd(
     }
     procPtr = TclOOGetProcFromMethod(clsPtr->constructorPtr);
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp,
-		"definition not available for this kind of method", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"definition not available for this kind of method", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "METHOD_TYPE", NULL);
 	return TCL_ERROR;
     }
@@ -937,16 +939,16 @@ InfoClassDefnCmd(
     }
     hPtr = Tcl_FindHashEntry(&clsPtr->classMethods, (char *) objv[2]);
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
     }
     procPtr = TclOOGetProcFromMethod(Tcl_GetHashValue(hPtr));
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp,
-		"definition not available for this kind of method", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"definition not available for this kind of method", -1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -1006,8 +1008,8 @@ InfoClassDestrCmd(
     }
     procPtr = TclOOGetProcFromMethod(clsPtr->destructorPtr);
     if (procPtr == NULL) {
-	Tcl_AppendResult(interp,
-		"definition not available for this kind of method", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"definition not available for this kind of method", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "METHOD_TYPE", NULL);
 	return TCL_ERROR;
     }
@@ -1085,17 +1087,17 @@ InfoClassForwardCmd(
     }
     hPtr = Tcl_FindHashEntry(&clsPtr->classMethods, (char *) objv[2]);
     if (hPtr == NULL) {
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
     }
     prefixObj = TclOOGetFwdFromMethod(Tcl_GetHashValue(hPtr));
     if (prefixObj == NULL) {
-	Tcl_AppendResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"prefix argument list not available for this kind of method",
-		NULL);
+		-1));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -1269,8 +1271,8 @@ InfoClassMethodTypeCmd(
     hPtr = Tcl_FindHashEntry(&clsPtr->classMethods, (char *) objv[2]);
     if (hPtr == NULL) {
     unknownMethod:
-	Tcl_AppendResult(interp, "unknown method \"", TclGetString(objv[2]),
-		"\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown method \"%s\"", TclGetString(objv[2])));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "METHOD",
 		TclGetString(objv[2]), NULL);
 	return TCL_ERROR;
@@ -1494,7 +1496,8 @@ InfoObjectCallCmd(
 
     contextPtr = TclOOGetCallContext(oPtr, objv[2], PUBLIC_METHOD, NULL);
     if (contextPtr == NULL) {
-	Tcl_AppendResult(interp, "cannot construct any call chain", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"cannot construct any call chain", -1));
 	return TCL_ERROR;
     }
     Tcl_SetObjResult(interp,
@@ -1538,7 +1541,8 @@ InfoClassCallCmd(
 
     callPtr = TclOOGetStereotypeCallChain(clsPtr, objv[2], PUBLIC_METHOD);
     if (callPtr == NULL) {
-	Tcl_AppendResult(interp, "cannot construct any call chain", NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"cannot construct any call chain", -1));
 	return TCL_ERROR;
     }
     Tcl_SetObjResult(interp, TclOORenderCallChain(interp, callPtr));
diff --git a/generic/tclOOMethod.c b/generic/tclOOMethod.c
index 877c3db..60eaa6e 100644
--- a/generic/tclOOMethod.c
+++ b/generic/tclOOMethod.c
@@ -1329,8 +1329,8 @@ TclOONewForwardInstanceMethod(
 	return NULL;
     }
     if (prefixLen < 1) {
-	Tcl_AppendResult(interp, "method forward prefix must be non-empty",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"method forward prefix must be non-empty", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_FORWARD", NULL);
 	return NULL;
     }
@@ -1371,8 +1371,8 @@ TclOONewForwardMethod(
 	return NULL;
     }
     if (prefixLen < 1) {
-	Tcl_AppendResult(interp, "method forward prefix must be non-empty",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"method forward prefix must be non-empty", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OO", "BAD_FORWARD", NULL);
 	return NULL;
     }
diff --git a/generic/tclOOStubLib.c b/generic/tclOOStubLib.c
index 3b6ce37..55f2378 100644
--- a/generic/tclOOStubLib.c
+++ b/generic/tclOOStubLib.c
@@ -53,8 +53,9 @@ TclOOInitializeStubs(
 
     if (clientData == NULL) {
 	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "Error loading ", packageName, " package; ",
-		"package not present or incomplete", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"error loading %s package; package not present or incomplete",
+		packageName));
 	return NULL;
     } else {
 	const TclOOStubs * const stubsPtr = clientData;
@@ -76,9 +77,9 @@ TclOOInitializeStubs(
 
     error:
 	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "Error loading ", packageName, " package",
-		" (requested version '", version, "', loaded version '",
-		actualVersion, "'): ", errMsg, NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf("Error loading %s package"
+		" (requested version '%s', loaded version '%s'): %s",
+		packageName, version, actualVersion, errMsg));
 	return NULL;
     }
 }
diff --git a/generic/tclParse.c b/generic/tclParse.c
index f0050c6..aab2fac 100644
--- a/generic/tclParse.c
+++ b/generic/tclParse.c
@@ -258,7 +258,8 @@ Tcl_ParseCommand(
 
     if ((start == NULL) && (numBytes != 0)) {
 	if (interp != NULL) {
-	    Tcl_SetResult(interp, "can't parse a NULL pointer", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "can't parse a NULL pointer", -1));
 	}
 	return TCL_ERROR;
     }
@@ -568,14 +569,14 @@ Tcl_ParseCommand(
 	}
 	if (src[-1] == '"') {
 	    if (interp != NULL) {
-		Tcl_SetResult(interp, "extra characters after close-quote",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"extra characters after close-quote", -1));
 	    }
 	    parsePtr->errorType = TCL_PARSE_QUOTE_EXTRA;
 	} else {
 	    if (interp != NULL) {
-		Tcl_SetResult(interp, "extra characters after close-brace",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"extra characters after close-brace", -1));
 	    }
 	    parsePtr->errorType = TCL_PARSE_BRACE_EXTRA;
 	}
@@ -1175,8 +1176,8 @@ ParseTokens(
 		}
 		if (numBytes == 0) {
 		    if (parsePtr->interp != NULL) {
-			Tcl_SetResult(parsePtr->interp,
-				"missing close-bracket", TCL_STATIC);
+			Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj(
+				"missing close-bracket", -1));
 		    }
 		    parsePtr->errorType = TCL_PARSE_MISSING_BRACKET;
 		    parsePtr->term = tokenPtr->start;
@@ -1411,8 +1412,8 @@ Tcl_ParseVarName(
 	}
 	if (numBytes == 0) {
 	    if (parsePtr->interp != NULL) {
-		Tcl_SetResult(parsePtr->interp,
-			"missing close-brace for variable name", TCL_STATIC);
+		Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj(
+			"missing close-brace for variable name", -1));
 	    }
 	    parsePtr->errorType = TCL_PARSE_MISSING_VAR_BRACE;
 	    parsePtr->term = tokenPtr->start-1;
@@ -1479,8 +1480,8 @@ Tcl_ParseVarName(
 	    }
 	    if ((parsePtr->term == src+numBytes) || (*parsePtr->term != ')')){
 		if (parsePtr->interp != NULL) {
-		    Tcl_SetResult(parsePtr->interp, "missing )",
-			    TCL_STATIC);
+		    Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj(
+			    "missing )", -1));
 		}
 		parsePtr->errorType = TCL_PARSE_MISSING_PAREN;
 		parsePtr->term = src;
@@ -1755,7 +1756,8 @@ Tcl_ParseBraces(
 	goto error;
     }
 
-    Tcl_SetResult(parsePtr->interp, "missing close-brace", TCL_STATIC);
+    Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj(
+	    "missing close-brace", -1));
 
     /*
      * Guess if the problem is due to comments by searching the source string
@@ -1857,7 +1859,8 @@ Tcl_ParseQuotedString(
     }
     if (*parsePtr->term != '"') {
 	if (parsePtr->interp != NULL) {
-	    Tcl_SetResult(parsePtr->interp, "missing \"", TCL_STATIC);
+	    Tcl_SetObjResult(parsePtr->interp, Tcl_NewStringObj(
+		    "missing \"", -1));
 	}
 	parsePtr->errorType = TCL_PARSE_MISSING_QUOTE;
 	parsePtr->term = start;
diff --git a/generic/tclPipe.c b/generic/tclPipe.c
index d0b136d..56a1846 100644
--- a/generic/tclPipe.c
+++ b/generic/tclPipe.c
@@ -542,8 +542,8 @@ TclCreatePipeline(
 	    }
 	    if (*p == '\0') {
 		if ((i == (lastBar + 1)) || (i == (argc - 1))) {
-		    Tcl_SetResult(interp, "illegal use of | or |& in command",
-			    TCL_STATIC);
+		    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			    "illegal use of | or |& in command", -1));
 		    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "EXEC",
 			    "PIPESYNTAX", NULL);
 		    goto error;
@@ -722,8 +722,8 @@ TclCreatePipeline(
 	 * We had a bar followed only by redirections.
 	 */
 
-	Tcl_SetResult(interp, "illegal use of | or |& in command",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"illegal use of | or |& in command", -1));
 	Tcl_SetErrorCode(interp, "TCL", "OPERATION", "EXEC", "PIPESYNTAX",
 		NULL);
 	goto error;
diff --git a/generic/tclPkg.c b/generic/tclPkg.c
index 382ffe3..730efec 100644
--- a/generic/tclPkg.c
+++ b/generic/tclPkg.c
@@ -850,7 +850,8 @@ Tcl_PackageObjCmd(
 	    if (res == 0){
 		if (objc == 4) {
 		    ckfree(argv3i);
-		    Tcl_SetResult(interp, availPtr->script, TCL_VOLATILE);
+		    Tcl_SetObjResult(interp,
+			    Tcl_NewStringObj(availPtr->script, -1));
 		    return TCL_OK;
 		}
 		Tcl_EventuallyFree(availPtr->script, TCL_DYNAMIC);
@@ -955,7 +956,8 @@ Tcl_PackageObjCmd(
 	    if (hPtr != NULL) {
 		pkgPtr = Tcl_GetHashValue(hPtr);
 		if (pkgPtr->version != NULL) {
-		    Tcl_SetResult(interp, pkgPtr->version, TCL_VOLATILE);
+		    Tcl_SetObjResult(interp,
+			    Tcl_NewStringObj(pkgPtr->version, -1));
 		}
 	    }
 	    return TCL_OK;
@@ -1017,7 +1019,8 @@ Tcl_PackageObjCmd(
 
 	if (objc == 2) {
 	    if (iPtr->packageUnknown != NULL) {
-		Tcl_SetResult(interp, iPtr->packageUnknown, TCL_VOLATILE);
+		Tcl_SetObjResult(interp,
+			Tcl_NewStringObj(iPtr->packageUnknown, -1));
 	    }
 	} else if (objc == 3) {
 	    if (iPtr->packageUnknown != NULL) {
diff --git a/generic/tclScan.c b/generic/tclScan.c
index d21bfaf..ef7eedf 100644
--- a/generic/tclScan.c
+++ b/generic/tclScan.c
@@ -261,6 +261,10 @@ ValidateFormat(
     int objIndex, xpgSize, nspace = numVars;
     int *nassign = TclStackAlloc(interp, nspace * sizeof(int));
     char buf[TCL_UTF_MAX+1];
+    Tcl_Obj *errorMsg;		/* Place to build an error messages. Note that
+				 * these are messy operations because we do
+				 * not want to use the formatting engine;
+				 * we're inside there! */
 
     /*
      * Initialize an array that records the number of times a variable is
@@ -328,9 +332,9 @@ ValidateFormat(
 	gotSequential = 1;
 	if (gotXpg) {
 	mixedXPG:
-	    Tcl_SetResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "cannot mix \"%\" and \"%n$\" conversion specifiers",
-		    TCL_STATIC);
+		    -1));
 	    Tcl_SetErrorCode(interp, "TCL", "FORMAT", "MIXEDSPECTYPES", NULL);
 	    goto error;
 	}
@@ -375,9 +379,9 @@ ValidateFormat(
 	switch (ch) {
 	case 'c':
 	    if (flags & SCAN_WIDTH) {
-		Tcl_SetResult(interp,
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
 			"field width may not be specified in %c conversion",
-			TCL_STATIC);
+			-1));
 		Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADWIDTH", NULL);
 		goto error;
 	    }
@@ -389,9 +393,11 @@ ValidateFormat(
 	    if (flags & (SCAN_LONGER|SCAN_BIG)) {
 	    invalidFieldSize:
 		buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
-		Tcl_AppendResult(interp,
-			"field size modifier may not be specified in %", buf,
-			" conversion", NULL);
+		errorMsg = Tcl_NewStringObj(
+			"field size modifier may not be specified in %", -1);
+		Tcl_AppendToObj(errorMsg, buf, -1);
+		Tcl_AppendToObj(errorMsg, " conversion", -1);
+		Tcl_SetObjResult(interp, errorMsg);
 		Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADSIZE", NULL);
 		goto error;
 	    }
@@ -409,8 +415,8 @@ ValidateFormat(
 	    break;
 	case 'u':
 	    if (flags & SCAN_BIG) {
-		Tcl_SetResult(interp,
-			"unsigned bignum scans are invalid", TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"unsigned bignum scans are invalid", -1));
 		Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADUNSIGNED",NULL);
 		goto error;
 	    }
@@ -446,15 +452,18 @@ ValidateFormat(
 	    }
 	    break;
 	badSet:
-	    Tcl_SetResult(interp, "unmatched [ in format string",
-		    TCL_STATIC);
-		Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BRACKET", NULL);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "unmatched [ in format string", -1));
+	    Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BRACKET", NULL);
 	    goto error;
 	default:
 	    buf[Tcl_UniCharToUtf(ch, buf)] = '\0';
-	    Tcl_AppendResult(interp, "bad scan conversion character \"", buf,
-		    "\"", NULL);
-		Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADTYPE", NULL);
+	    errorMsg = Tcl_NewStringObj(
+		    "bad scan conversion character \"", -1);
+	    Tcl_AppendToObj(errorMsg, buf, -1);
+	    Tcl_AppendToObj(errorMsg, "\"", -1);
+	    Tcl_SetObjResult(interp, errorMsg);
+	    Tcl_SetErrorCode(interp, "TCL", "FORMAT", "BADTYPE", NULL);
 	    goto error;
 	}
 	if (!(flags & SCAN_SUPPRESS)) {
@@ -498,9 +507,9 @@ ValidateFormat(
     }
     for (i = 0; i < numVars; i++) {
 	if (nassign[i] > 1) {
-	    Tcl_SetResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "variable is assigned by multiple \"%n$\" conversion specifiers",
-		    TCL_STATIC);
+		    -1));
 	    Tcl_SetErrorCode(interp, "TCL", "FORMAT", "POLYASSIGNED", NULL);
 	    goto error;
 	} else if (!xpgSize && (nassign[i] == 0)) {
@@ -509,9 +518,9 @@ ValidateFormat(
 	     * and/or numVars != 0), then too many vars were given
 	     */
 
-	    Tcl_SetResult(interp,
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		    "variable is not assigned by any conversion specifiers",
-		    TCL_STATIC);
+		    -1));
 	    Tcl_SetErrorCode(interp, "TCL", "FORMAT", "UNASSIGNED", NULL);
 	    goto error;
 	}
@@ -522,13 +531,13 @@ ValidateFormat(
 
   badIndex:
     if (gotXpg) {
-	Tcl_SetResult(interp, "\"%n$\" argument index out of range",
-		TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"\"%n$\" argument index out of range", -1));
 	Tcl_SetErrorCode(interp, "TCL", "FORMAT", "INDEXRANGE", NULL);
     } else {
-	Tcl_SetResult(interp,
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
 		"different numbers of variable names and field specifiers",
-		TCL_STATIC);
+		-1));
 	Tcl_SetErrorCode(interp, "TCL", "FORMAT", "FIELDVARMISMATCH", NULL);
     }
 
diff --git a/generic/tclTrace.c b/generic/tclTrace.c
index 529c38a..3888549 100644
--- a/generic/tclTrace.c
+++ b/generic/tclTrace.c
@@ -434,9 +434,9 @@ TraceExecutionObjCmd(
 	    return result;
 	}
 	if (listLen == 0) {
-	    Tcl_SetResult(interp, "bad operation list \"\": must be "
-		    "one or more of enter, leave, enterstep, or leavestep",
-		    TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "bad operation list \"\": must be one or more of"
+		    " enter, leave, enterstep, or leavestep", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "TRACE", "NOOPS",
 		    NULL);
 	    return TCL_ERROR;
@@ -677,8 +677,9 @@ TraceCommandObjCmd(
 	    return result;
 	}
 	if (listLen == 0) {
-	    Tcl_SetResult(interp, "bad operation list \"\": must be "
-		    "one or more of delete or rename", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "bad operation list \"\": must be one or more of"
+		    " delete or rename", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "TRACE", "NOOPS",
 		    NULL);
 	    return TCL_ERROR;
@@ -875,8 +876,9 @@ TraceVariableObjCmd(
 	    return result;
 	}
 	if (listLen == 0) {
-	    Tcl_SetResult(interp, "bad operation list \"\": must be "
-		    "one or more of array, read, unset, or write", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "bad operation list \"\": must be one or more of"
+		    " array, read, unset, or write", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "OPERATION", "TRACE", "NOOPS",
 		    NULL);
 	    return TCL_ERROR;
@@ -2715,7 +2717,8 @@ TclCallVarTraces(
 	    if (disposeFlags & TCL_TRACE_RESULT_OBJECT) {
 		Tcl_SetObjResult((Tcl_Interp *)iPtr, (Tcl_Obj *) result);
 	    } else {
-		Tcl_SetResult((Tcl_Interp *)iPtr, result, TCL_STATIC);
+		Tcl_SetObjResult((Tcl_Interp *)iPtr,
+			Tcl_NewStringObj(result, -1));
 	    }
 	    Tcl_AddErrorInfo((Tcl_Interp *)iPtr, "");
 
diff --git a/generic/tclUtil.c b/generic/tclUtil.c
index 63c9fb2..6d42080 100644
--- a/generic/tclUtil.c
+++ b/generic/tclUtil.c
@@ -655,16 +655,16 @@ TclFindElement(
     if (p == limit) {
 	if (openBraces != 0) {
 	    if (interp != NULL) {
-		Tcl_SetResult(interp, "unmatched open brace in list",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"unmatched open brace in list", -1));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "LIST", "BRACE",
 			NULL);
 	    }
 	    return TCL_ERROR;
 	} else if (inQuotes) {
 	    if (interp != NULL) {
-		Tcl_SetResult(interp, "unmatched open quote in list",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"unmatched open quote in list", -1));
 		Tcl_SetErrorCode(interp, "TCL", "VALUE", "LIST", "QUOTE",
 			NULL);
 	    }
@@ -810,8 +810,8 @@ Tcl_SplitList(
 	if (i >= size) {
 	    ckfree(argv);
 	    if (interp != NULL) {
-		Tcl_SetResult(interp, "internal error in Tcl_SplitList",
-			TCL_STATIC);
+		Tcl_SetObjResult(interp, Tcl_NewStringObj(
+			"internal error in Tcl_SplitList", -1));
 		Tcl_SetErrorCode(interp, "TCL", "INTERNAL", "Tcl_SplitList",
 			NULL);
 	    }
@@ -3382,16 +3382,10 @@ TclGetIntForIndex(
 
   parseError:
     if (interp != NULL) {
-	/*
-	 * The result might not be empty; this resets it which should be both
-	 * a cheap operation, and of little problem because this is an
-	 * error-generation path anyway.
-	 */
-
 	bytes = Tcl_GetString(objPtr);
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "bad index \"", bytes,
-		"\": must be integer?[+-]integer? or end?[+-]integer?", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad index \"%s\": must be integer?[+-]integer? or"
+		" end?[+-]integer?", bytes));
 	if (!strncmp(bytes, "end-", 4)) {
 	    bytes += 4;
 	}
@@ -3483,9 +3477,8 @@ SetEndOffsetFromAny(
     if ((*bytes != 'e') || (strncmp(bytes, "end",
 	    (size_t)((length > 3) ? 3 : length)) != 0)) {
 	if (interp != NULL) {
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "bad index \"", bytes,
-		    "\": must be end?[+-]integer?", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "bad index \"%s\": must be end?[+-]integer?", bytes));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "INDEX", NULL);
 	}
 	return TCL_ERROR;
@@ -3519,9 +3512,8 @@ SetEndOffsetFromAny(
 
     badIndexFormat:
 	if (interp != NULL) {
-	    Tcl_ResetResult(interp);
-	    Tcl_AppendResult(interp, "bad index \"", bytes,
-		    "\": must be end?[+-]integer?", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "bad index \"%s\": must be end?[+-]integer?", bytes));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "INDEX", NULL);
 	}
 	return TCL_ERROR;
@@ -3597,8 +3589,8 @@ TclCheckBadOctal(
 		 * be added to an existing error message as extra info.
 		 */
 
-		Tcl_AppendResult(interp, " (looks like invalid octal number)",
-			NULL);
+		Tcl_AppendToObj(Tcl_GetObjResult(interp),
+			" (looks like invalid octal number)", -1);
 	    }
 	    return 1;
 	}
@@ -4214,7 +4206,7 @@ TclReToGlob(
 
   invalidGlob:
     if (interp != NULL) {
-	Tcl_AppendResult(interp, msg, NULL);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(msg, -1));
 	Tcl_SetErrorCode(interp, "TCL", "RE2GLOB", code, NULL);
     }
     Tcl_DStringFree(dsPtr);
diff --git a/generic/tclVar.c b/generic/tclVar.c
index e92dc5f..e31e9cf 100644
--- a/generic/tclVar.c
+++ b/generic/tclVar.c
@@ -3065,7 +3065,8 @@ ArrayStartSearchCmd(
 
     if ((varPtr == NULL) || !TclIsVarArray(varPtr)
 	    || TclIsVarUndefined(varPtr)) {
-	Tcl_AppendResult(interp, "\"", varName, "\" isn't an array", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't an array", varName));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY", varName, NULL);
 	return TCL_ERROR;
     }
@@ -3160,8 +3161,8 @@ ArrayAnyMoreCmd(
 
     if ((varPtr == NULL) || !TclIsVarArray(varPtr)
 	    || TclIsVarUndefined(varPtr)) {
-	Tcl_AppendResult(interp, "\"", TclGetString(varNameObj),
-		"\" isn't an array", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't an array", TclGetString(varNameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY",
 		TclGetString(varNameObj), NULL);
 	return TCL_ERROR;
@@ -3266,8 +3267,8 @@ ArrayNextElementCmd(
 
     if ((varPtr == NULL) || !TclIsVarArray(varPtr)
 	    || TclIsVarUndefined(varPtr)) {
-	Tcl_AppendResult(interp, "\"", TclGetString(varNameObj),
-		"\" isn't an array", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't an array", TclGetString(varNameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY",
 		TclGetString(varNameObj), NULL);
 	return TCL_ERROR;
@@ -3376,8 +3377,8 @@ ArrayDoneSearchCmd(
 
     if ((varPtr == NULL) || !TclIsVarArray(varPtr)
 	    || TclIsVarUndefined(varPtr)) {
-	Tcl_AppendResult(interp, "\"", TclGetString(varNameObj),
-		"\" isn't an array", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't an array", TclGetString(varNameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY",
 		TclGetString(varNameObj), NULL);
 	return TCL_ERROR;
@@ -4019,8 +4020,8 @@ ArrayStatsCmd(
 
     if ((varPtr == NULL) || !TclIsVarArray(varPtr)
 	    || TclIsVarUndefined(varPtr)) {
-	Tcl_AppendResult(interp, "\"", TclGetString(varNameObj),
-		"\" isn't an array", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"\"%s\" isn't an array", TclGetString(varNameObj)));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAY",
 		TclGetString(varNameObj), NULL);
 	return TCL_ERROR;
@@ -4028,7 +4029,8 @@ ArrayStatsCmd(
 
     stats = Tcl_HashStats((Tcl_HashTable *) varPtr->value.tablePtr);
     if (stats == NULL) {
-	Tcl_SetResult(interp, "error reading array statistics", TCL_STATIC);
+	Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		"error reading array statistics", -1));
 	return TCL_ERROR;
     }
     Tcl_SetObjResult(interp, Tcl_NewStringObj(stats, -1));
@@ -4317,10 +4319,10 @@ ObjMakeUpvar(
 			|| (varFramePtr == NULL)
 			|| !HasLocalVars(varFramePtr)
 			|| (strstr(TclGetString(myNamePtr), "::") != NULL))) {
-	    Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
-		    TclGetString(myNamePtr), "\": upvar won't create "
+	    Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf(
+		    "bad variable name \"%s\": upvar won't create "
 		    "namespace variable that refers to procedure variable",
-		    NULL);
+		    TclGetString(myNamePtr)));
 	    Tcl_SetErrorCode(interp, "TCL", "UPVAR", "INVERTED", NULL);
 	    return TCL_ERROR;
 	}
@@ -4418,9 +4420,10 @@ TclPtrObjMakeUpvar(
 		 * myName looks like an array reference.
 		 */
 
-		Tcl_AppendResult((Tcl_Interp *) iPtr, "bad variable name \"",
-			myName, "\": upvar won't create a scalar variable "
-			"that looks like an array element", NULL);
+		Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf(
+			"bad variable name \"%s\": upvar won't create a"
+			" scalar variable that looks like an array element",
+			myName));
 		Tcl_SetErrorCode(interp, "TCL", "UPVAR", "LOCAL_ELEMENT",
 			NULL);
 		return TCL_ERROR;
@@ -4447,15 +4450,15 @@ TclPtrObjMakeUpvar(
     }
 
     if (varPtr == otherPtr) {
-	Tcl_SetResult((Tcl_Interp *) iPtr,
-		"can't upvar from variable to itself", TCL_STATIC);
+	Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_NewStringObj(
+		"can't upvar from variable to itself", -1));
 	Tcl_SetErrorCode(interp, "TCL", "UPVAR", "SELF", NULL);
 	return TCL_ERROR;
     }
 
     if (TclIsVarTraced(varPtr)) {
-	Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
-		"\" has traces: can't use for upvar", NULL);
+	Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf(
+		"variable \"%s\" has traces: can't use for upvar", myName));
 	Tcl_SetErrorCode(interp, "TCL", "UPVAR", "TRACED", NULL);
 	return TCL_ERROR;
     } else if (!TclIsVarUndefined(varPtr)) {
@@ -4469,8 +4472,8 @@ TclPtrObjMakeUpvar(
 	 */
 
 	if (!TclIsVarLink(varPtr)) {
-	    Tcl_AppendResult((Tcl_Interp *) iPtr, "variable \"", myName,
-		    "\" already exists", NULL);
+	    Tcl_SetObjResult((Tcl_Interp *) iPtr, Tcl_ObjPrintf(
+		    "variable \"%s\" already exists", myName));
 	    Tcl_SetErrorCode(interp, "TCL", "UPVAR", "EXISTS", NULL);
 	    return TCL_ERROR;
 	}
@@ -4968,8 +4971,8 @@ Tcl_UpvarObjCmd(
 	 * for this particular case.
 	 */
 
-	Tcl_AppendResult(interp, "bad level \"", TclGetString(levelObj), "\"",
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"bad level \"%s\"", TclGetString(levelObj)));
 	Tcl_SetErrorCode(interp, "TCL", "VALUE", "LEVEL", NULL);
 	return TCL_ERROR;
     }
@@ -4978,8 +4981,8 @@ Tcl_UpvarObjCmd(
      * We've now finished with parsing levels; skip to the variable names.
      */
 
-    objc -= hasLevel+1;
-    objv += hasLevel+1;
+    objc -= hasLevel + 1;
+    objv += hasLevel + 1;
 
     /*
      * Iterate over each (other variable, local variable) pair. Divide the
@@ -5060,8 +5063,8 @@ SetArraySearchObj(
     return TCL_OK;
 
   syntax:
-    Tcl_AppendResult(interp, "illegal search identifier \"", string, "\"",
-	    NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "illegal search identifier \"%s\"", string));
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", string, NULL);
     return TCL_ERROR;
 }
@@ -5126,10 +5129,9 @@ ParseSearchId(
      */
 
     if (strcmp(string+offset, varName) != 0) {
-	Tcl_AppendResult(interp, "search identifier \"", string,
-		"\" isn't for variable \"", varName, "\"", NULL);
-	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", string,
-		NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"search identifier \"%s\" isn't for variable \"%s\"",
+		string, varName));
 	goto badLookup;
     }
 
@@ -5153,7 +5155,8 @@ ParseSearchId(
 	    }
 	}
     }
-    Tcl_AppendResult(interp, "couldn't find search \"", string, "\"", NULL);
+    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+	    "couldn't find search \"%s\"", string));
   badLookup:
     Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "ARRAYSEARCH", string, NULL);
     return NULL;
@@ -5894,8 +5897,8 @@ ObjFindNamespaceVar(
 	Tcl_DecrRefCount(simpleNamePtr);
     }
     if ((varPtr == NULL) && (flags & TCL_LEAVE_ERR_MSG)) {
-	Tcl_ResetResult(interp);
-	Tcl_AppendResult(interp, "unknown variable \"", name, "\"", NULL);
+	Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		"unknown variable \"%s\"", name));
 	Tcl_SetErrorCode(interp, "TCL", "LOOKUP", "VARIABLE", name, NULL);
     }
     return (Tcl_Var) varPtr;
diff --git a/generic/tclZlib.c b/generic/tclZlib.c
index a799639..8a57a91 100644
--- a/generic/tclZlib.c
+++ b/generic/tclZlib.c
@@ -577,8 +577,8 @@ Tcl_ZlibStreamInit(
 	TclDStringAppendObj(&cmdname, Tcl_GetObjResult(interp));
 	if (Tcl_GetCommandInfo(interp, Tcl_DStringValue(&cmdname),
 		&cmdinfo) == 1) {
-	    Tcl_SetResult(interp,
-		    "BUG: Stream command name already exists", TCL_STATIC);
+	    Tcl_SetObjResult(interp, Tcl_NewStringObj(
+		    "BUG: Stream command name already exists", -1));
 	    Tcl_SetErrorCode(interp, "TCL", "BUG", "EXISTING_CMD", NULL);
 	    Tcl_DStringFree(&cmdname);
 	    goto error;
@@ -900,8 +900,8 @@ Tcl_ZlibStreamPut(
 
     if (zshPtr->streamEnd) {
 	if (zshPtr->interp) {
-	    Tcl_SetResult(zshPtr->interp,
-		    "already past compressed stream end", TCL_STATIC);
+	    Tcl_SetObjResult(zshPtr->interp, Tcl_NewStringObj(
+		    "already past compressed stream end", -1));
 	    Tcl_SetErrorCode(zshPtr->interp, "TCL", "ZIP", "CLOSED", NULL);
 	}
 	return TCL_ERROR;
@@ -1085,9 +1085,9 @@ Tcl_ZlibStreamGet(
 
 	    if (zshPtr->stream.avail_in > 0) {
 		if (zshPtr->interp) {
-		    Tcl_SetResult(zshPtr->interp,
-			"Unexpected zlib internal state during decompression",
-			TCL_STATIC);
+		    Tcl_SetObjResult(zshPtr->interp, Tcl_NewStringObj(
+			    "unexpected zlib internal state during"
+			    " decompression", -1));
 		    Tcl_SetErrorCode(zshPtr->interp, "TCL", "ZIP", "STATE",
 			    NULL);
 		}
@@ -2581,8 +2581,9 @@ ZlibTransformSetOption(			/* not used */
 	} else if (value[0] == 's' && strcmp(value, "sync") == 0) {
 	    flushType = Z_SYNC_FLUSH;
 	} else {
-	    Tcl_AppendResult(interp, "unknown -flush type \"", value,
-		    "\": must be full or sync", NULL);
+	    Tcl_SetObjResult(interp, Tcl_ObjPrintf(
+		    "unknown -flush type \"%s\": must be full or sync",
+		    value));
 	    Tcl_SetErrorCode(interp, "TCL", "VALUE", "FLUSH", NULL);
 	    return TCL_ERROR;
 	}
@@ -3152,7 +3153,7 @@ Tcl_ZlibStreamInit(
     Tcl_Obj *dictObj,
     Tcl_ZlibStream *zshandle)
 {
-    Tcl_SetResult(interp, "unimplemented", TCL_STATIC);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj("unimplemented", -1));
     Tcl_SetErrorCode(interp, "TCL", "UNIMPLEMENTED", NULL);
     return TCL_ERROR;
 }
@@ -3218,7 +3219,7 @@ Tcl_ZlibDeflate(
     int level,
     Tcl_Obj *gzipHeaderDictObj)
 {
-    Tcl_SetResult(interp, "unimplemented", TCL_STATIC);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj("unimplemented", -1));
     Tcl_SetErrorCode(interp, "TCL", "UNIMPLEMENTED", NULL);
     return TCL_ERROR;
 }
@@ -3231,7 +3232,7 @@ Tcl_ZlibInflate(
     int bufferSize,
     Tcl_Obj *gzipHeaderDictObj)
 {
-    Tcl_SetResult(interp, "unimplemented", TCL_STATIC);
+    Tcl_SetObjResult(interp, Tcl_NewStringObj("unimplemented", -1));
     Tcl_SetErrorCode(interp, "TCL", "UNIMPLEMENTED", NULL);
     return TCL_ERROR;
 }