#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 nomeata): Are Core’s coercions expressible enough for this? I don’t think so. So one would have to resort to `unsafeCoerce` here, which wouldn’t be nice. Or this can be done at the STG stage, but then we might miss further optimizations. Tricky. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9291#comment:2 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler