Try -ddump-deriv http://haskell.cs.yale.edu/ghc/docs/latest/html/users_guide/options-debu gging.html#DUMPING-OUTPUT Simon -----Original Message----- From: Jong Keun Na [mailto:jongkn@microsoft.com] Sent: 07 February 2003 06:15 To: haskell-cafe@haskell.org Subject: Auto generated instance codes through 'deriving' Hello folks, Is there any method with which I can see instance's codes generated automatically by using 'deriving' keyword in GHC? I'm curious in how GHC generates 'Read' class's instance code for user-defined data type. Any help will be great appreciated. /JongKeun