deal with mtl/monads-tf conflict

I had been using -ignore-package monads-tf to deal with this, but
the XMPP library uses monads-tf, so that also ignores it. Instead,
use PackageImports to force use of mtl in my own code.

1 files changed, 3 insertions, 1 deletions

diff --git a/Utility/State.hs b/Utility/State.hs
index c27f3c261..7f8919082 100644
--- a/Utility/State.hs
+++ b/Utility/State.hs
@@ -5,9 +5,11 @@
  - Licensed under the GNU GPL version 3 or higher.
  -}
 
+{-# LANGUAGE PackageImports #-}
+
 module Utility.State where
 
-import Control.Monad.State.Strict
+import "mtl" Control.Monad.State.Strict
 
 {- Modifies Control.Monad.State's state, forcing a strict update.
  - This avoids building thunks in the state and leaking.