⍝ Test for D function:

    var←99
    prim←+
    derv←+/
    trad←⍎⎕fx'trad fn' ''
    dfn←{dfn}
    dop←{dop ⍺⍺}

    isdfn¨'var' 'prim' 'derv' 'trad' 'dfn' 'dop'
0 0 0 0 1 0

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