Non-exhaustive patterns in function zip_ty_env
The following code:
data T a where
P :: L1 -> L2
data L1 = L1
data L2 = L2Produces this panic:
bug.hs:1:0:
Data constructor `P' returns type `L2' instead of its parent type
When checking the data constructor:ghc-6.4.1: panic! (the `impossible' happened, GHC version 6.4.1):
types/Type.lhs:(1107,0)-(1108,77): Non-exhaustive patterns in function zip_ty_envTrac metadata
| Trac field | Value |
|---|---|
| Version | 6.4.1 |
| Type | Bug |
| TypeOfFailure | OtherFailure |
| Priority | normal |
| Resolution | Unresolved |
| Component | Compiler (Type checker) |
| Test case | |
| Differential revisions | |
| BlockedBy | |
| Related | |
| Blocking | |
| CC | |
| Operating system | Unknown |
| Architecture | Unknown |