TcTyFuns.flattenType: unexpected PredType
type family Garbage y
type instance Garbage y = [Num y => y]yields
*Main> undefined :: Garbage Int
ghc: panic! (the 'impossible' happened)
(GHC version 6.10.1 for x86_64-unknown-linux):
TcTyFuns.flattenType: unexpected PredType
Please report this as a GHC bug: http://www.haskell.org/ghc/reportabugWhile its perfectly reasonable to die out on garbage like this, a less apocalyptic error message might be nice.
Trac metadata
| Trac field | Value |
|---|---|
| Version | 6.10.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | ekmett@gmail.com |
| Operating system | |
| Architecture |