#11172: Turning on optimisations produces Impossible case alternative -------------------------------------+------------------------------------- Reporter: nh2 | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.0.1 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: Runtime crash | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): I fell at the first fence. I downloaded your custom `aeson`, cd'd into its directory. Then {{{ bash$ cabal install --with-ghc=/home/simonpj/5builds/HEAD-4/inplace/bin /ghc-stage2 Resolving dependencies... cabal: Could not resolve dependencies: trying: aeson-0.10.0.0 (user goal) trying: base-4.9.0.0/installed-4.9... (dependency of aeson-0.10.0.0) next goal: vector (dependency of aeson-0.10.0.0) rejecting: vector-0.11.0.0 (conflict: base==4.9.0.0/installed-4.9..., vector => base>=4.3 && <4.9) trying: vector-0.10.12.3 next goal: primitive (dependency of vector-0.10.12.3) rejecting: primitive-0.6.1.0, 0.5.4.0 (conflict: base==4.9.0.0/installed-4.9..., primitive => base>=4.3 && <4.9) rejecting: primitive-0.5.3.0, 0.5.2.1 (conflict: base==4.9.0.0/installed-4.9..., primitive => base>=4.3 && <4.8) rejecting: primitive-0.5.1.0 (conflict: base==4.9.0.0/installed-4.9..., primitive => base>=4 && <4.8) rejecting: primitive-0.5.0.1 (conflict: base==4.9.0.0/installed-4.9..., primitive => base>=4 && <4.7) rejecting: primitive-0.5, 0.4.1, 0.4.0.1, 0.4, 0.3.1, 0.3, 0.2.1, 0.2, 0.1 (conflict: vector => primitive>=0.5.0.1 && <0.7) rejecting: primitive-0.6 (conflict: base==4.9.0.0/installed-4.9..., primitive => base>=4.3 && <4.9) Dependency tree exhaustively searched. simonpj@cam-05-unx:~/tmp/aeson-ghc-8-head-workaround$ }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/11172#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler