guix/gnu/packages/patches/ghc-clock-realfrag.patch

From 8372e801ef062223756db69818a7b60cfd9bb066 Mon Sep 17 00:00:00 2001
From: amesgen <amesgen@amesgen.de>
Date: Tue, 8 Aug 2023 23:36:45 +0200
Subject: [PATCH] Fix `RealFrac Seconds` instance

---
 System/Clock/Seconds.hs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/System/Clock/Seconds.hs b/System/Clock/Seconds.hs
index a9a1c78..f7457cb 100644
--- a/System/Clock/Seconds.hs
+++ b/System/Clock/Seconds.hs
@@ -50,7 +50,7 @@ instance Fractional Seconds where
 
 instance RealFrac Seconds where
   properFraction (Seconds (TimeSpec s ns))
-    | s >= 0 = (fromIntegral s, Seconds $ TimeSpec 0 ns)
+    | s >= 0 || ns == 0 = (fromIntegral s, Seconds $ TimeSpec 0 ns)
     | otherwise = (fromIntegral (s+1), Seconds $ TimeSpec (-1) ns)
 
 -- | The 'getTime' function shall return the current value for the