#15673: ghc: panic! (the 'impossible' happened) -------------------------------------+------------------------------------- Reporter: mcmayer | Owner: (none) Type: bug | Status: new Priority: normal | Milestone: 8.4.4 Component: Compiler | Version: 8.4.3 Resolution: | Keywords: Operating System: MacOS X | Architecture: x86_64 Type of failure: GHC doesn't work | (amd64) at all | Test Case: Blocked By: | Blocking: Related Tickets: 14959 | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Changes (by mcmayer): * related: => 14959 Old description:
The following few lines produce a GHC panic:
{{{#!hs module Main where
import Data.Bits (shift)
badOne :: [Int] -> Integer -- replace Integer by Int and all is good! badOne is = sum $ zipWith (\n _->shift 1 n) [0..] is
main = return () :: IO () }}}
The function is stripped down as much as possible, it doesn't perform anything all to meaningful anymore.
The error message is:
{{{#!bash ghc: panic! (the 'impossible' happened) (GHC version 8.4.3 for x86_64-apple-darwin): heap overflow }}}
All else is off-the-shelf stack lts-12.10 via
{{{#!bash stack new bad-one simple }}}
Tested on Mac OS X and Debian.
New description: The following few lines produce a GHC panic: {{{#!hs module Main where import Data.Bits (shift) badOne :: [Int] -> Integer -- replace Integer by Int and all is good! badOne is = sum $ zipWith (\n _->shift 1 n) [0..] is main = return () :: IO () }}} The function is stripped down as much as possible, it doesn't perform anything all to meaningful anymore. The error message is: {{{#!bash ghc: panic! (the 'impossible' happened) (GHC version 8.4.3 for x86_64-apple-darwin): heap overflow }}} All else is off-the-shelf stack lts-12.10 via {{{#!bash stack new bad-one simple }}} Tested on Mac OS X and Debian. This has some resemblance to[https://ghc.haskell.org/trac/ghc/ticket/14959 #14959]. -- -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/15673#comment:4 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler