#13544: ghc panic -------------------------------------+------------------------------------- Reporter: shauryab98 | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.0.2 Keywords: | Operating System: Windows Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- I got this error: {{{ ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-mingw32): initTc: unsolved constraints WC {wc_insol = [W] %_a1El :: t_a1Ek[tau:1] (CHoleCan: %)} }}} while compiling the following code {{{#!hs halveEvens :: [Integer] -> [Integer] halveEvens = map . filter (\c -> c%2 == 0) }}} -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13544 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler