Impossible happened
ghc-6.7.20070702: panic! (the 'impossible' happened)
(GHC version 6.7.20070702 for i386-unknown-linux):
nameModule $dMonad{v a1BV5}
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabug
Unfortunately, I have no test case, but it happened during the evaluation of something of type IO ([(Int, Int)]) which uses undecidable instances, functional dependencies and the no monomorphism restriction.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.7 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | highest |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | Unknown |
| Architecture | Unknown |