#8631: Need ImpredicativeTypes for GeneralizedNewtypeDeriving? -------------------------------------+------------------------------------ Reporter: goldfire | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.7 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Unknown/Multiple Type of failure: None/Unknown | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: -------------------------------------+------------------------------------ Comment (by Richard Eisenberg <eir@…>): In [changeset:"674c969c240632da70ed2928fa30c20a9a52e5dc/ghc"]: {{{ #!CommitTicketReference repository="ghc" revision="674c969c240632da70ed2928fa30c20a9a52e5dc" Fix #8631. This patch allows turning on ImpredicativeTypes while type-checking the code generated by GeneralizedNewtypeDeriving. It does this by adding a field ib_extensions to InstBindings, informing the type-checker what extensions should be enabled while type-checking the instance. }}} -- Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/8631#comment:10> GHC <http://www.haskell.org/ghc/> The Glasgow Haskell Compiler