12 lines
394 B
Text
12 lines
394 B
Text
--| Convert an `Optional` value into the equivalent `List`
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let toList
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: ∀(a : Type) → Optional a → List a
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= λ(a : Type) →
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λ(o : Optional a) →
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merge { Some = λ(x : a) → [ x ] : List a, None = [] : List a } o
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let example0 = assert : toList Natural (Some 1) ≡ [ 1 ]
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let example1 = assert : toList Natural (None Natural) ≡ ([] : List Natural)
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in toList
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