data A =
  B 

data A =
  B  -- ^ Hello

data A =
  B  -- ^ Hello

data A =
  B  -- ^ Hello

data A
  = B 
  | C 

data A
  = B 
  | C 
  | D 

data A
  = B 
  | C 
  | D 

data A
  = B 
  | C 
  | D 

data A
  = B 
  | C 
  | D 
  deriving (Show)

data A
  = B 
  | C 
  | D 
  deriving (Show,Eq)

data A =
  B Int
  deriving (Show,Eq)

data A
  = B Int
  | C String
  deriving (Show,Eq)