Ticket #7458 (closed bug: invalid)

Opened 6 months ago

Last modified 4 months ago

ghc panic

Reported by: timsears Owned by:
Priority: normal Milestone:
Component: Compiler Version: 7.4.1
Keywords: Cc:
Operating System: Linux Architecture: x86
Type of failure: Compile-time crash Difficulty: Unknown
Test Case: Blocked By:
Blocking: Related Tickets:

Description (last modified by igloo) (diff)

As ghc requested I am reporting this... All I can say right now is that I am tracking down a bug involving overlapping instances. 

ghc: panic! (the 'impossible' happened)
  (GHC version 7.4.1 for i386-unknown-linu
	tcTyVarDetails
    ( t{tv acw0} [tv] :: ghc-prim:GHC.Prim.*{(w) tc 34d} )

Please report this as a GHC bug:  http://www.haskell.org/ghc/reportabug

Change History

Changed 6 months ago by timsears

I should be clear. This happened while I was tracking down a bug involving overlapping instances in MY code.

Changed 6 months ago by guest

Can you paste the code causing the crash?

Changed 6 months ago by simonpj

  • status changed from new to infoneeded
  • difficulty set to Unknown

Hard to do anything without more info. There are various tickets involving "tcTyVarDetails" (as you can see with a quick search), some of them fixed, so I'm guessing it's one of those.

Changed 4 months ago by igloo

  • description modified (diff)

Changed 4 months ago by igloo

  • status changed from infoneeded to closed
  • resolution set to invalid

No testcase, so closing.

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