# Pastebin rsBXUD6Q
hs-cimple/src/Language/Cimple/Flatten.hs:59:10: error:
    • No instance for (GenConcatsFlatten (Maybe [a]) a)
        arising from a use of ‘Language.Cimple.Flatten.$dmconcats’
    • In the expression:
        Language.Cimple.Flatten.$dmconcats @(NodeF a [a]) @(a)
      In an equation for ‘concats’:
          concats = Language.Cimple.Flatten.$dmconcats @(NodeF a [a]) @(a)
      In the instance declaration for ‘Concats (NodeF a [a]) a’
   |
59 | instance Concats (NodeF a [a]) a
   |          ^^^^^^^^^^^^^^^^^^^^^^^