#12926: ghc master (8.1.20161202) panics with assertion failure with devel2 flavor and -O2 -------------------------------------+------------------------------------- Reporter: pacak | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler | Version: 8.1 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: Type of failure: Compile-time | Unknown/Multiple crash or panic | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by RyanGlScott): I can't reproduce this with GHC 8.1.20161207. Do I need to do something differently? {{{ $ ghc/inplace/bin/ghc-stage2 -O2 Bug.hs -fforce-recomp [1 of 1] Compiling A ( Bug.hs, Bug.o ) Bug.hs:20:10: warning: [-Wmissing-methods] • No explicit implementation for ‘basicOverlaps’, ‘basicInitialize’, and ‘basicUnsafeRead’ • In the instance declaration for ‘MVector Data.Vector.Unboxed.Base.MVector A’ Bug.hs:28:10: warning: [-Wmissing-methods] • No explicit implementation for ‘Data.Vector.Generic.Base.basicUnsafeFreeze’, ‘Data.Vector.Generic.Base.basicUnsafeThaw’, ‘Data.Vector.Generic.Base.basicLength’, ‘Data.Vector.Generic.Base.basicUnsafeSlice’, and ‘Data.Vector.Generic.Base.basicUnsafeIndexM’ • In the instance declaration for ‘Data.Vector.Generic.Base.Vector Data.Vector.Unboxed.Base.Vector A’ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12926#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler