wobble typo

Cabal/Distribution/Simple/Utils.hs

@@ -712,7 +712,7 @@ addLibraryPath os paths env = do
   ldEnv <- maybe libPaths (++ (searchPathSeparator:libPaths)) <$>
            lookupEnv ldPath
 
-  return (env ++ (ldPath,ldEnv))
+  return (env ++ [(ldPath,ldEnv)])
 
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 -- File globbing