#13600: surprising error message with bang pattern -------------------------------------+------------------------------------- Reporter: andrewufrank | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Poor/confusing | (amd64) error message | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): You need to turn on the `BangPatterns` extension, otherwise you are defining an infix operator `!`. The error message is then accurate as you have given a type signature for `f4` but then defined `!`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13600#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler