#16179: Mention DerivingStrategies in the warning when DeriveAnyClass and GeneralizedNewtypeDeriving are both enabled -------------------------------------+------------------------------------- Reporter: ckoparkar | Owner: (none) Type: feature | Status: new request | Priority: normal | Milestone: 8.10.1 Component: Compiler | Version: Keywords: deriving | Operating System: Unknown/Multiple Architecture: | Type of failure: None/Unknown Unknown/Multiple | Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- When {{{DeriveAnyClass}}} and {{{GeneralizedNewtypeDeriving}}} are both enabled, GHC prints out the following warning for every {{{deriving C}}}: {{{ #!haskell warning: • Both DeriveAnyClass and GeneralizedNewtypeDeriving are enabled Defaulting to the DeriveAnyClass strategy for instantiating C }}} Would it be useful to point the users to {{{DerivingStrategies}}} ? {{{Use DerivingStrategies to pick a different strategy}}}, or something similar? I'm not sure if this was already discussed before, I couldn't find any related tickets. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16179 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler