#9160: Panic: Template variable unbound in rewrite rule ---------------------------------------+---------------------------------- Reporter: mietek | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.8.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: x86_64 (amd64) Type of failure: Compile-time crash | Difficulty: Unknown Test Case: | Blocked By: Blocking: | Related Tickets: #4524 ---------------------------------------+---------------------------------- Description changed by mietek: Old description:
Installing `singletons-1.0` with GHC 7.8.2 on OS X 10.9.2 fails:
{{{ ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-apple-darwin): Template variable unbound in rewrite rule }}}
See also [https://github.com/goldfirere/singletons/issues/83 goldfirere/singletons#83]
New description: Installing `singletons-1.0` with GHC 7.8.2 on both OS X 10.9.2 and Ubuntu 2014.04 fails: {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.8.2 for x86_64-apple-darwin): Template variable unbound in rewrite rule }}} This seems to be an issue with the optimizer, as the bug only appears with optimization level 2, using the following line in `~/.cabal/config`: {{{ optimization: 2 }}} See also [https://github.com/goldfirere/singletons/issues/83 goldfirere/singletons#83] -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9160#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler