#13750: GHC produces incorrect coercions in hairy code -------------------------------------+------------------------------------- Reporter: dfeuer | Owner: (none) Type: bug | Status: new Priority: highest | Milestone: 8.2.2 Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: #13429 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by RyanGlScott): * cc: simonpj (added) * related: => #13429 Comment: Commit a920404fb12fb52a59e4f728cce4d662a418c5f8 (Fix TcSimplify.decideQuantification for kind variables) caused this regression. On a related note, that same commit also caused another class of program to loop at runtime in https://ghc.haskell.org/trac/ghc/ticket/13429#comment:16, so there's definitely something fishy with this commit. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13750#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler