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  • Glasgow Haskell Compiler
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  • #644
Closed
Open
Created Jan 03, 2006 by Simon Marlow@simonmarDeveloper

Non-exhaustive patterns in function zip_ty_env

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
Trac metadata
Trac field Value
Version 6.4.1
Type Bug
TypeOfFailure OtherFailure
Priority normal
Resolution Unresolved
Component Compiler (Type checker)
Test case
Differential revisions
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Operating system Unknown
Architecture Unknown
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