#9969: panic in T7562 -------------------------------------+------------------------------------- Reporter: nomeata | Owner: simonpj Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.4 Keywords: | Operating System: Unknown/Multiple Architecture: | Type of failure: Compile-time Unknown/Multiple | crash Test Case: T7562 | Blocked By: Blocking: | Related Tickets: #7562 Differential Revisions: | -------------------------------------+------------------------------------- Various people observe this test failure: {{{ =====> T7562(normal) 869 of 4389 [0, 0, 0] cd ./typecheck/should_compile && '/home/jojo/build/haskell/ghc- validate/inplace/bin/ghc-stage2' -fforce-recomp -dcore-lint -dcmm-lint -dno-debug-output -no-user-package-db -rtsopts -fno-warn-tabs -fno-ghci- history -c T7562.hs -fno-warn-incomplete-patterns >T7562.comp.stderr 2>&1 Compile failed (status 256) errors were: T7562.hs:3:14: Warning: UNPACK pragma lacks '!' on the first argument of ‘Pair2’ In the definition of data constructor ‘Pair2’ In the data declaration for ‘Pair2’ ghc-stage2: panic! (the 'impossible' happened) (GHC version 7.11.20150108 for x86_64-unknown-linux): toIfaceBang Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} According to my logs, this was caused by changeset:9564bb8c84cbc0397a414e946cc8c28801f0fbe7/ghc -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9969 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler