==================== Parser ====================
module ShouldCompile where
data A
  = -- | A comment that documents the first constructor
    A |
    -- | comment for B 
    B |
    -- | comment for C  
    C |
    D



haddockA030.hs:7:5: warning: [GHC-05641] [-Winvalid-haddock]
    Multiple Haddock comments for a single entity are not allowed.
    The extraneous comment will be ignored.