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T16512a.hs:41:25: error:
    • Couldn't match type: ListVariadic as (a -> b)
                     with: a -> ListVariadic as b
      Expected: AST (ListVariadic (a : as) b)
        Actual: AST (ListVariadic as (a -> b))
    • In the first argument of ‘AnApplication’, namely ‘g’
      In the expression: AnApplication g (a `ConsAST` as)
      In a case alternative:
          AnApplication g as -> AnApplication g (a `ConsAST` as)
    • Relevant bindings include
        as :: ASTs as (bound at T16512a.hs:40:25)
        g :: AST (ListVariadic as (a -> b)) (bound at T16512a.hs:40:23)
        a :: AST a (bound at T16512a.hs:38:15)
        f :: AST (a -> b) (bound at T16512a.hs:38:10)
        unapply :: AST b -> AnApplication b (bound at T16512a.hs:38:1)