From 3ad35f766e6869087c97a5c8129ab06ddf1856d4 Mon Sep 17 00:00:00 2001
From: Ben Gamari <ben@smart-cactus.org>
Date: Tue, 22 Oct 2019 13:12:10 -0400
Subject: base: Add @since on GHC.IO.Handle.Lock.hUnlock

Unfortunately this was introduced in base-4.11.0 (GHC 8.4.1)
whereas the other locking primitives were added in base-4.10.0 (GHC
8.2.1).

diff --git a/libraries/base/GHC/IO/Handle/Lock.hsc b/libraries/base/GHC/IO/Handle/Lock.hsc
index ec85ffd..0b700f8 100644
--- a/libraries/base/GHC/IO/Handle/Lock.hsc
+++ b/libraries/base/GHC/IO/Handle/Lock.hsc
@@ -100,6 +100,8 @@ hTryLock :: Handle -> LockMode -> IO Bool
 hTryLock h mode = lockImpl h "hTryLock" mode False
 
 -- | Release a lock taken with 'hLock' or 'hTryLock'.
+--
+-- @since 4.11.0.0
 hUnlock :: Handle -> IO ()
 hUnlock = unlockImpl
 
-- 
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