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Editorial Team
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Asked: 2026-06-15T15:08:53+00:00

As shown in the title: let (+) x y z = x + y

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As shown in the title:

let (+) x y z = x + y + z in 5+6 7

Why is this expression wrong?

The error says Error: This expression is not a function; it cannot be applied. But what I see is a function, it just redefine the operator of +.

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1 Answer

  1. Editorial Team

    Because you’re trying to call 6 with the argument 7 and 6 is not a function. Try

    let (+) x y z = x + y + z in (5 + 6) 7
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