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trace2 added by anonymous on Sat Oct 21 01:51:58 2017

Error: bad argument count - received 0 but expected 1: #<procedure (? value)>

        Call history:

        <eval>    (+ c cv)
        <eval>    (+ a av)
        <eval>    (+ b bv)
        <eval>    (+ c cv)
        <eval>    (+ a av)
        <eval>    (+ b bv)
        <eval>    (+ c cv)
        <eval>    (+ a av)
        <eval>    (+ b bv)
        <eval>    (+ c cv)
        <eval>    (+ a av)
        <eval>    (+ b bv)
        <eval>    (+ c cv)
        <eval>    (+ a av)
        <eval>    (+ b bv)
        <eval>    (+ c cv)      <--
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Which procedure can be used to check whether its argument is a symbol?
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