#8851: Standalone deriving and GND behave differently --------------------------------------------+------------------------------ Reporter: simonpj | Owner: goldfire Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (Type checker) | Version: 7.8.1-rc1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: None/Unknown | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: --------------------------------------------+------------------------------ Changes (by goldfire): * owner: => goldfire Comment: I took a briefish look at this yesterday and am somewhat confused, but I'll take a closer look and submit a fix in the next few days. I actually think acceptance is correct because of Joachim's (nomeata's) reasoning. It is indeed unsafe to convert a ''dictionary'' for `Monad Parser` to a ''dictionary'' for `Monad InnerIdrisParser`. But, the `notFollowedBy` function takes this dictionary as a parameter, and so coherence is somehow not an issue. Even as I'm writing this, I don't fully believe it, but my hunch is still that "accept" is the right answer. I'll elaborate more when I can put some more consecutive cycles into this. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8851#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler