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13 lines
202 B
Bash
13 lines
202 B
Bash
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Prelude> head []
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*** Exception: Prelude.head: empty list
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Prelude> tail []
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*** Exception: Prelude.tail: empty list
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Prelude> tail [1]
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[]
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Prelude> head [1]
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1
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Prelude> null []
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True
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Prelude> null [[]]
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False
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