#9035: ghci sometimes displays Word32 as Word64 ------------------------------------------------+-------------------------- Reporter: MikeIzbicki | Owner: Type: bug | Status: closed Priority: normal | Milestone: Component: GHCi | Version: 7.8.2 Resolution: invalid | Keywords: Operating System: Linux | Architecture: x86_64 Type of failure: Incorrect result at runtime | (amd64) Test Case: | Difficulty: Blocking: | Unknown | Blocked By: | Related Tickets: ------------------------------------------------+-------------------------- Comment (by simonpj): I think it would be a great idea for Core Lint to check for uses of `unsafeCoerce` that don't obey the rules. It won't catch all cases, of course, but it would have caught this one. Specficially, look for: * Coercions between lifted and unboxed types * Coercion between unboxed types of different sizes * Coercion between unboxed ints and floats. Would anyone like to make a patch for this? Anything that can be checked by Core Lint, should be checked! I'm afraid I don't know where to look for the reason for the int/float difficulty. I'd write a tiny function that exhibits the unsafe conversion and look the code it generates. Simon -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9035#comment:6 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler