#15431: Coercible and Existential types don't play nicely -------------------------------------+------------------------------------- Reporter: NioBium | Owner: (none) Type: bug | Status: merge Priority: normal | Milestone: 8.6.1 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Roles Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: #14333 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by simonpj): * status: new => merge Comment: There was a palpable bug that meant the constraint was marked as insoluble, when it wasn't. This fixes both the OP and coment:1. The fix in #14333 (comment:10) does the symmetry bit. I agree that incompleteness is still lurking! The fix is a modest one; could be merged. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15431#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler