#16322: "deriving newtype instance" generates an infinite loop -------------------------------------+------------------------------------- Reporter: paf31 | Owner: (none) Type: bug | Status: infoneeded Priority: normal | Milestone: Component: Compiler | Version: 8.6.3 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by paf31): To be clear, I now understand why this code should fail to compile, because the instance precondition should be `C (X String a) b`, and not `C a b`. But I still think it shouldn't loop at runtime. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/16322#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler