#14434: GHC 8.2.1 picks wrong instances with -O in a presence of an OVERLAPPABLE instance -------------------------------------+------------------------------------- Reporter: dredozubov | Owner: (none) Type: bug | Status: merge Priority: high | Milestone: 8.2.3 Component: Compiler | Version: 8.2.1 Resolution: | Keywords: Operating System: Linux | Architecture: x86_64 | (amd64) Type of failure: Incorrect result | Test Case: at runtime | typecheck/should_compile/T14434 Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by dredozubov): Thanks for the fix! Unfortunately I was unable to build our application with ghc HEAD due to broken dependencies. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14434#comment:7 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler