Impossible Happening (deriving problem?)
The (hopefully) attached file does the impossible:
ghc -c P.hs -o P.o
ghc-5.00: panic! (the `impossible' happened, GHC
version 5.00):
<<loop>>
If the types `NoteFun' and `PhraseFun' are replaced by
`()', the bug goes away.Trac metadata
| Trac field | Value |
|---|---|
| Version | None |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | ResolvedFixed |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | |
| Architecture |