⍝ Apply operand function to native file tie:

    fid←'Dfns Test Temp File'

    {22:: ⋄ {}⍵ ⎕nerase ⍵ ⎕ntie 0} fid        ⍝ ensure file doesn't exist.

    _←⎕nuntie fid ⎕ncreate 0

    ⎕nsize file fid
0
    _←fid ⎕nerase fid ⎕ntie 0

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