Created
January 17, 2020 22:10
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| module _ where | |
| open import Data.Nat | |
| open import Data.Bool | |
| open import Relation.Binary.PropositionalEquality | |
| data Tree : Set where | |
| Leaf : Tree | |
| Node : Tree -> Tree -> ℕ -> Tree | |
| nonempty : Tree -> Bool | |
| nonempty Leaf = false | |
| nonempty _ = true | |
| left : (t : Tree) -> {T (nonempty t)} -> Tree | |
| left Leaf {()} | |
| left (Node l _ _) {_} = l | |
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