#14170: 8.2.1 regression: GHC fails to simplify `natVal` -------------------------------------+------------------------------------- Reporter: vagarenko | Owner: (none) Type: bug | Status: new Priority: high | Milestone: 8.2.2 Component: Compiler | Version: 8.2.1 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 bgamari): I'm not really sure representing `Integer` and `Natural` is a great idea. Afterall, we then need to painstakingly evaluate all of the constant folding rules to ensure we don't, for instance, rewrite `(5 - 9) :: Natural` to `-4`. Moreover, distinguishing `Integer` `LitIntegers` from `Natural` `LitIntegers` on the basis of type alone would mean that `CorePrep` will need to do a type comparison in `cpeRhsE` instead of just deciding on the basis of which `Literal` constructor was used. In sum, I suspect `Integer` and `Natural` are just different enough to warrant separate constructors. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14170#comment:3 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler