T5892a.hs:12:8: error: [-Wmissing-fields (in -Wdefault), -Werror=missing-fields]
    • Fields of ‘Node’ not initialised: subForest
    • In the expression: Node {..}
      In the expression: let rootLabel = [] in Node {..}
      In an equation for ‘foo’:
          foo (Node {..}) = let rootLabel = ... in Node {..}