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  • #7178

Closed
Open
Opened Aug 22, 2012 by Simon Peyton Jones@simonpjDeveloper

Panic in coVarsOfTcCo

Ganesh says: I'm getting the panic below when building darcs 2.8 with GHC 7.6. It'll take some effort to cut it down or give repro instructions for an uncut-down version (I needed to hack a lot of underlying packages to be able to even get as far as doing this build), so could someone confirm that it's worth it before I do so? I can't spot anything already reporting this in trac.

ghc.exe: panic! (the 'impossible' happened)
  (GHC version 7.6.0.20120810 for i386-unknown-mingw32):
        coVarsOfTcCo:Bind
    cobox{v a6Czs} [lid]
      = cobox{v a6CTr} [lid] `cast`
(<main:Darcs.Test.Patch.WithState.WithState{tc r1LL8}
                                        model{tv tC} [tv]
   ..blah blah..
Trac metadata
Trac field Value
Version 7.4.2
Type Bug
TypeOfFailure OtherFailure
Priority highest
Resolution Unresolved
Component Compiler
Test case
Differential revisions
BlockedBy
Related
Blocking
CC
Operating system
Architecture
Assignee
Assign to
7.6.1
Milestone
7.6.1
Assign milestone
Time tracking
None
Due date
None
Reference: ghc/ghc#7178