#9160: Panic: Template variable unbound in rewrite rule -------------------------------------+------------------------------------- Reporter: mietek | Owner: Type: bug | Status: new Priority: normal | Milestone: 7.8.3 Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: | Architecture: x86_64 (amd64) Unknown/Multiple | Difficulty: Unknown Type of failure: Compile- | Blocked By: time crash | Related Tickets: #4524 Test Case: | indexed_types/should_fail/T9160 | Blocking: | Differential Revisions: | -------------------------------------+------------------------------------- Changes (by mjo): * status: closed => new * resolution: fixed => Comment: I'm seeing the same symptoms with 7.8.3: {{{ $ ghc --version The Glorious Glasgow Haskell Compilation System, version 7.8.3 }}} Only with -O2 set, again. {{{ $ cd singletons-1.0/ $ runghc Setup.hs configure --user -O2 Configuring singletons-1.0... $ runghc Setup.hs build ... [39 of 45] Compiling Data.Singletons.Prelude.List ( src/Data/Singletons/Prelude/List.hs, dist/build/Data/Singletons/Prelude/List.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.8.3 for x86_64-unknown-linux): Template variable unbound in rewrite rule }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9160#comment:10 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler