Opened 2 years ago

Closed 2 years ago

#7458 closed bug (invalid)

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 Test Case:
Blocked By: Blocking:
Related Tickets: Differential Revisions:

Description (last modified by igloo)

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 (5)

comment:1 Changed 2 years ago by timsears

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

comment:2 Changed 2 years ago by guest

Can you paste the code causing the crash?

comment:3 Changed 2 years ago by simonpj

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

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.

comment:4 Changed 2 years ago by igloo

  • Description modified (diff)

comment:5 Changed 2 years ago by igloo

  • Resolution set to invalid
  • Status changed from infoneeded to closed

No testcase, so closing.

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