Tcl_Obj *objPtr = Tcl_GetObjResult(interp);

    if (Tcl_IsShared(objPtr)) {
	objPtr = Tcl_DuplicateObj(objPtr);
    }
    Tcl_AppendStringsToObjVA(objPtr, argList);
    Tcl_SetObjResult(interp, objPtr);

    /*
     * Strictly we should call Tcl_GetStringResult(interp) here to make sure
     * that interp->result is correct according to the old contract, but that
     * makes the performance of much code (e.g. in Tk) absolutely awful. So we
     * leave it out; code that really wants interp->result can just insert the
     * calls to Tcl_GetStringResult() itself. [Patch 1041072 discussion]
     */

#ifdef USE_INTERP_RESULT
    /*
     * Ensure that the interp->result is legal so old Tcl 7.* code still
     * works. There's still embarrasingly much of it about...
     */

    (void) Tcl_GetStringResult(interp);
#endif /* USE_INTERP_RESULT */
}

/*
 *----------------------------------------------------------------------
 *
 * Tcl_AppendResult --
 *