#13612: ghc.exe: panic! (the 'impossible' happened) -------------------------------------+------------------------------------- Reporter: hmemcpy | 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: -------------------------------------+------------------------------------- Full output: {{{ ghc.exe: panic! (the 'impossible' happened) (GHC version 8.0.2 for x86_64-unknown-mingw32): initTc: unsolved constraints WC {wc_insol = [W] n_a1qA :: t_a1qz[tau:1] (CHoleCan: n)} Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} This failed on a trivial (albeit incorrect) "Hello world" code, while trying to execute it with stack: **stack Main.hs** The code file is attached. Note that this error happens when it incorrectly specifies the non- existing value **n** (instead of **name**) in the last expression. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13612 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler