just read the error message.txt

/Users/ca/projects/datagraph/src/Main.hs:168:3:
    Couldn't match type ‘HashMap k0 v0’
                   with ‘GenHaxl () (HashMap Text ResponseValue)’
    Expected type: (AST.Selection
                    -> GenHaxl () (AST.Name, ResponseValue))
                   -> TheMonad (HashMap Text ResponseValue)
      Actual type: (AST.Selection -> [b0]) -> HashMap k0 v0
    The first argument of ($) takes one argument,
    its type is ‘f0 b1’,
    it is specialized to ‘(AST.Selection -> [b0]) -> HashMap k0 v0’
    In a stmt of a 'do' block:
      HashMap.fromList <$> forM selectionSet
      $ \case {
          AST.SelectionField (AST.Field alias
                                        name
                                        arguments
                                        directives
                                        innerSelectionSet)
            -> do { let ...;
                    let ...;
                    .... }
          _ -> fail "unsupported selection" }
    In the expression:
      do { HashMap.fromList <$> forM selectionSet
           $ \case {
               AST.SelectionField (AST.Field alias
                                             name
                                             arguments
                                             directives
                                             innerSelectionSet)
                 -> do { ... }
               _ -> fail "unsupported selection" } }