#14612: unsolved constraints, panic during compilation -------------------------------------+------------------------------------- Reporter: msk | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.2 Keywords: | Operating System: Linux Architecture: x86_64 | Type of failure: Compile-time (amd64) | crash or panic Test Case: | Blocked By: Blocking: | Related Tickets: Differential Rev(s): | Wiki Page: -------------------------------------+------------------------------------- Code: {{{#!hs import Graphics.X11.Xlib getWindowRect :: Display -> Window -> IO Rectangle getWindowRect dpy w = fmap makeRect (getWindowAttributes dpy w) }}} Error: {{{ # ghc main.hs [1 of 1] Compiling Main ( main.hs, main.o ) ghc: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-linux): initTc: unsolved constraints WC {wc_insol = [W] makeRect_a1LX :: t_a1LW[tau:1] (CHoleCan: makeRect) [W] getWindowAttributes_a1M2 :: t_a1M1[tau:1] (CHoleCan: getWindowAttributes)} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} Compiler: {{{ ghc --version The Glorious Glasgow Haskell Compilation System, version 8.0.2 }}} Graphics.X11.Xlib from the ArchHaskell package: {{{ haskell-x11 1.8.x0-1 }}} Frankly, I'm just following the request made by the compiler output "Please report this as a GHC bug" and have no idea what's going on. Hopefully this isn't spurious. Let me know if I can help at all. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/14612 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler