The experiment deployment of TclDuplicatePureObj() has been reverted from

the trunk.  This branch attempts to prepare a reversion for the
core-8-branch also, via a cherrypick and resolution of conflicts.

Starting an experiment in one new release to reject it
in the next is at best odd.  Also, valgrind test runs of core-8-branch
show memory leaks with TclDuplicatePureObj() on the stack trace.  This
checkin shows a clean valgrind run.

There are three test failures on this checkin, which I hope someone versed
in the ArithSeries work can resolve.  They are the tests:

lseq-3.14
lseq-4.19
lseq-bug-54329e39c7

merge bug-bc7ddc7944 (revert use of TclDuplicatePureObj)

1 files changed, 1 insertions, 5 deletions

diff --git a/generic/tclEvent.c b/generic/tclEvent.c
index 5848728..5501721 100644
--- a/generic/tclEvent.c
+++ b/generic/tclEvent.c
@@ -243,11 +243,7 @@ HandleBgErrors(
 	 * support one handler setting another handler.
 	 */
 
-	Tcl_Obj *copyObj = TclDuplicatePureObj(
-	    interp, assocPtr->cmdPrefix, &tclListType);
-	if (!copyObj) {
-	    return;
-	}
+	Tcl_Obj *copyObj = TclListObjCopy(NULL, assocPtr->cmdPrefix);
 
 	errPtr = assocPtr->firstBgPtr;