Ticket #644 (closed bug: fixed)
Non-exhaustive patterns in function zip_ty_env
| Reported by: | simonmar | Owned by: | |
|---|---|---|---|
| Priority: | normal | Milestone: | 6.4.2 |
| Component: | Compiler (Type checker) | Version: | 6.4.1 |
| Keywords: | Cc: | ||
| Operating System: | Unknown/Multiple | Architecture: | Unknown/Multiple |
| Type of failure: | Difficulty: | Unknown | |
| Test Case: | Blocked By: | ||
| Blocking: | Related Tickets: |
Description
The following code:
data T a where
P :: L1 -> L2
data L1 = L1
data L2 = L2
Produces 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_env
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