// RUN: %dafny /compile:0 "%s" > "%t"
// RUN: %diff "%s.expect" "%t"

datatype Maybe<T> = Some(v:T) | None
datatype B = B(b:Maybe<B>)

datatype List<T> = Nil | Cons(T, List<T>)
datatype Tree<T> = Nodes(children: List<Tree<T>>)