#9291: Don't reconstruct sum types if the type subtly changes ----------------------------+---------------------------------------------- Reporter: schyler | Owner: Type: feature | Status: new request | Milestone: Priority: normal | Version: 7.8.2 Component: | Keywords: Compiler | Architecture: Unknown/Multiple Resolution: | Difficulty: Moderate (less than a day) Operating System: | Blocked By: Unknown/Multiple | Related Tickets: Type of failure: | None/Unknown | Test Case: | Blocking: | ----------------------------+---------------------------------------------- Comment (by goldfire): That's an interesting idea, perhaps somewhat saner than dependently-typed coercions. But, proving such a thing type-safe would be quite a bear, I think. It seems to hinge on parametricity, which is not yet proven for Haskell or Core. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9291#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler