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any Natural Natural/even (Some 2) ≡ True
any Natural Natural/even (None Natural) ≡ False
Source
{-
Returns `True` if the supplied function returns `True` for a present element and
`False` otherwise
-}
let any
: ∀(a : Type) → (a → Bool) → Optional a → Bool
= λ(a : Type)
→ λ(f : a → Bool)
→ λ(xs : Optional a)
→ merge { Some = f, None = False } xs
let example0 = assert : any Natural Natural/even (Some 2) ≡ True
let example1 = assert : any Natural Natural/even (None Natural) ≡ False
in any