base: Export GHC.Event(.Internal).Lifetime

This was an unfortunate oversight in the original event manager rework
patch. Fixes #10308

Differential Revision: https://phabricator.haskell.org/D845

libraries/base/GHC/Event.hs

@@ -25,6 +25,7 @@ module GHC.Event
     , evtWrite
     , IOCallback
     , FdKey(keyFd)
+    , Lifetime(..)
     , registerFd
     , unregisterFd
     , unregisterFd_

libraries/base/GHC/Event/Internal.hs

@@ -84,6 +84,8 @@ evtConcat = foldl' evtCombine evtNothing
 {-# INLINE evtConcat #-}
 
 -- | The lifetime of a registration.
+--
+-- @since 4.8.1.0
 data Lifetime = OneShot | MultiShot
               deriving (Show, Eq)
 

libraries/base/changelog.md

@@ -39,6 +39,8 @@
 
   * Bundled with GHC 7.10.2
 
+  * `Lifetime` is now exported from `GHC.Event`
+
 ## 4.8.0.0  *Mar 2015*
 
   * Bundled with GHC 7.10.1