#8755: Happy parser file compilation causes panic ---------------------------------------+---------------------------------- Reporter: wting | Owner: Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 7.6.3 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: ---------------------------------------+---------------------------------- Comment (by wting): Sorry, this also fails on 7.4.1: {{{ ╭─ting@sloth ~/code/cs345 ‹python-2.7.3› ‹hw2› ╰─➤ ghc DeclareParse.hs [1 of 4] Compiling Base ( Base.hs, Base.o ) [2 of 4] Compiling Lexer ( Lexer.hs, Lexer.o ) [3 of 4] Compiling Declare ( Declare.hs, Declare.o ) [4 of 4] Compiling DeclareParse ( DeclareParse.hs, DeclareParse.o ) ghc: panic! (the 'impossible' happened) (GHC version 7.4.1 for x86_64-unknown-linux): Prelude.head: empty list Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug }}} I'm going to try and investigate further. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/8755#comment:1 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler