#4159: move Monad and MonadFix instances for Either from mtl to base
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Reporter: ross | Owner:
Type: proposal | Status: new
Priority: normal | Component: libraries/base
Version: 6.12.3 | Keywords:
Os: Unknown/Multiple | Testcase:
Architecture: Unknown/Multiple | Failure: None/Unknown
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These patches move the Monad and MonadFix instances for Either (currently
in the mtl package) to Control.Monad.Instances and Control.Monad.Fix
respectively (both in the base package). The Monad instance is still an
orphan, to retain Haskell 98 compatibility, but the MonadFix instance is
together with its class. The Error constraint is removed from both
instances, and the default definition of fail is used.
Discussion deadline: 20th July 2010
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Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4159>
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