#7178: Panic in coVarsOfTcCo ---------------------------------+------------------------------------------ Reporter: simonpj | Owner: Type: bug | Status: new Priority: highest | Milestone: 7.6.1 Component: Compiler | Version: 7.4.2 Keywords: | Os: Unknown/Multiple Architecture: Unknown/Multiple | Failure: None/Unknown Difficulty: Unknown | Testcase: Blockedby: | Blocking: Related: | ---------------------------------+------------------------------------------ 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.. }}}
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