catclose ?-fail | -nofail? cathandle
          Close the message catalog specified by cathandle.  Nor-
          mally,  errors are ignored.  If -fail is specified, any
          errors closing the message catalog file  are  returned.
          The  option  -nofail  specifies the default behavior of
          not returning an error.  The use of  -fail  only  makes
          sense if it was also specified in the call to catopen.

          This command is provided by Extended Tcl.