Library /sys$common/syshlp/DBG$HELP.HLB  —  DEBUG  Messages  MASKNOTUSED
 mask operations not allowed on record and SCAN tree objects

    Facility: DEBUG, VMS Debugger

    Explanation: A mask operation (as specified by the /TMASK or
    /FMASK qualifiers) cannot be performed on a record or SCAN tree
    object.

    User Action: Specify an array or address range to perform the
    mask operation on.
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