#10549: floatExpr tick break<2> -------------------------------------+------------------------------------- Reporter: NeilMitchell | Owner: Type: bug | Status: new Priority: high | Milestone: 7.10.3 Component: Compiler | Version: 7.10.2 Resolution: | Keywords: Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Revisions: -------------------------------------+------------------------------------- Changes (by thomie): * priority: normal => high * version: 7.11 => 7.10.2 * milestone: => 7.10.3 Comment: Here is a test to reproduce the problem with ghci. {{{ {-# OPTIONS_GHC -O2 #-} module T10549 where import qualified Data.ByteString.Internal as Internal import System.IO.Unsafe (unsafePerformIO) import Data.Word (Word8) import Foreign.Ptr (Ptr) import Foreign.Storable (peek) type S = Ptr Word8 chr :: S -> Char chr x = Internal.w2c $ unsafePerformIO $ peek x }}} Running `ghc-7.10.1 --interactive T10549.hs` results in: {{{ GHCi, version 7.10.1: http://www.haskell.org/ghc/ :? for help T10549.hs:1:16: Warning: -O conflicts with --interactive; -O ignored [1 of 1] Compiling T10549 ( T10549.hs, interpreted ) Ok, modules loaded: T10549. }}} Running `ghc-7.10.2 --interactive T10549.hs` results in: {{{ GHCi, version 7.10.2: http://www.haskell.org/ghc/ :? for help [1 of 1] Compiling T10549 ( T10549.hs, interpreted ) ghc: panic! (the 'impossible' happened) (GHC version 7.10.2 for x86_64-unknown-linux): floatExpr tick break<3>() }}} So somehow the `OPTIONS_GHC -O2` in the file doesn't get ignored (it does when given on the command line). To reproduce the problem with the Shake sources (version 0.15.4), run `ghci src/Development/Ninja/Lexer.hs -isrc`. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/10549#comment:5 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler