allFlags |= tracePtr->flags;
    }

    /*
     * The code below makes it possible to delete traces while traces are
     * active: it makes sure that the deleted trace won't be processed by
     * TclCallVarTraces.
     *
     * Caveat (Bug 3062331): When an unset trace handler on a variable
     * tries to delete a different unset trace handler on the same variable,
     * the results may be surprising.  When variable unset traces fire, the
     * traced variable is already gone.  So the TclLookupVar() call above
     * will not find that variable, and not finding it will never reach here
     * to perform the deletion.  This means callers of Tcl_UntraceVar*()
     * attempting to delete unset traces from within the handler of another
     * unset trace have to account for the possibility that their call to
     * Tcl_UntraceVar*() is a no-op.
     */

    for (activePtr = iPtr->activeVarTracePtr;  activePtr != NULL;
	    activePtr = activePtr->nextPtr) {
	if (activePtr->nextTracePtr == tracePtr) {
	    activePtr->nextTracePtr = tracePtr->nextPtr;
	}