#8729: Compile crashed with panic! (the 'impossible' happened) ---------------------------------------+----------------------------------- Reporter: zabirauf | Owner: Type: bug | Status: closed Priority: high | Milestone: 7.6.1 Component: Compiler | Version: 7.4.1 Resolution: fixed | Keywords: Operating System: Linux | Architecture: Type of failure: Compile-time crash | Unknown/Multiple Test Case: | Difficulty: Unknown Blocking: | Blocked By: | Related Tickets: ---------------------------------------+----------------------------------- Changes (by hvr): * status: new => closed * architecture: x86_64 (amd64) => Unknown/Multiple * milestone: => 7.6.1 * keywords: panic! impossible compiler crash => * resolution: => fixed Old description:

The following code results in a compiler crash with error ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): nameModule show{tv a9N}

Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug

The code can be found at [http://pastie.org/8692515]

New description: The following code results in a compiler crash with error {{{ ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): nameModule show{tv a9N} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} The code can be found at [http://pastie.org/8692515] -- Comment: Thanks for the report, however this has been fixed in GHC 7.6.1 already, which gives the following compile error: {{{ t8729.hs:1:65: Illegal deriving item `show' In the data declaration for `LinkedList' }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8729#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler