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# Using scoped function fibI inside fib
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proc fib(x: int): int =
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proc fibI(n: int): int =
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if n < 2: n else: fibI(n-2) + fibI(n-1)
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if x < 0:
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raise newException(ValueError, "Invalid argument")
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return fibI(x)
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for i in 0..4:
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echo fib(i)
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# fibI(10) # undeclared identifier 'fibI'
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