
#13708: Panic! (the "impossible" happened) bug in GHC 8.2.1 rc2 -------------------------------------+------------------------------------- Reporter: deech | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: Component: Compiler | Version: 8.2.1-rc2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by mpickering): I can reproduce this now with {{{ /usr/local/bin/ghc-8.2.0.20170507 -O src/821rc2-panic-bug.hs '-fmax- simplifier-iterations=0' -fforce-recomp }}} The `-O` and `-fmax-simplifier-iterations` are both necessary. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/13708#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler