#9303: O2: (GHC version 7.8.3 for x86_64-unknown-linux): allocateRegsAndSpill: Cannot read from uninitialized register %vI_s1Mp ----------------------------------+--------------------------------------- Reporter: slyfox | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler (NCG) | Version: 7.8.3 Keywords: | Operating System: Unknown/Multiple Architecture: x86_64 (amd64) | Type of failure: Compile-time crash Difficulty: Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | ----------------------------------+--------------------------------------- {{{ ghc --make -O2 M.hs [1 of 1] Compiling M ( M.hs, M.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-linux): allocateRegsAndSpill: Cannot read from uninitialized register %vI_s1Mp Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} As in #9155 bug was caught on '''wx''' package in the same module. I didn't try to trim it down to minimal sample. No external modules required. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9303 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler