Remove reference to mtl.

package.yaml

@@ -22,9 +22,8 @@ description:         Please see the README on Github at
 dependencies:
   - base >=4.7 && <5
   - bytestring >=0.10.8.1 && <0.11
-  - exceptions >=0.6 && <0.9
-  - free >=4.12 && <=5.0.1
-  - mtl >=2.2.1 && <2.3
+  - exceptions >=0.6 && <0.11
+  - free >=5.0.1 && <6
   - text >=1.2.2.2 && <1.3
   - transformers >=0.4 && <0.6
 

postlude.cabal

@@ -4,7 +4,7 @@ cabal-version: 1.12
 --
 -- see: https://github.com/sol/hpack
 --
--- hash: 279baf8a9c78e19c42e376ae268fa1e0869c2f0f3a7cf2c091f4d286fcaadcb6
+-- hash: dfac36d217ad061f0c553491a9c1b6f14008ae9d0955634102e91bd883e19642
 
 name:           postlude
 version:        0.1.1.0
@@ -36,9 +36,8 @@ library
   build-depends:
       base >=4.7 && <5
     , bytestring >=0.10.8.1 && <0.11
-    , exceptions >=0.6 && <0.9
-    , free >=4.12 && <=5.0.1
-    , mtl >=2.2.1 && <2.3
+    , exceptions >=0.6 && <0.11
+    , free >=5.0.1 && <6
     , text >=1.2.2.2 && <1.3
     , transformers >=0.4 && <0.6
   default-language: Haskell2010

src/Postlude.hs

@@ -83,30 +83,18 @@ import Control.Monad.Catch as X
   , try
   )
 
-import Control.Monad.Except as X
-  ( MonadError, catchError, throwError
-  )
-
-import Control.Monad.Reader as X
-  ( MonadReader, ask, local, reader
-  )
-
-import Control.Monad.State as X
-  ( MonadState, get, put, state
-  )
-
-import Control.Monad.Trans as X
+import Control.Monad.IO.Class as X
   ( MonadIO, liftIO
-  , MonadTrans, lift
   )
 
-import Control.Monad.Writer as X
-  ( MonadWriter, listen, pass, tell, writer
+import Control.Monad.Trans.Class as X
+  ( MonadTrans, lift
   )
 
 import Control.Monad.Trans.Except as X
   ( Except
   , ExceptT, ExceptT(ExceptT), runExceptT
+  , catchE, throwE
   )
 
 import Control.Monad.Trans.Free as X
@@ -119,6 +107,7 @@ import Control.Monad.Trans.Free as X
 import Control.Monad.Trans.Reader as X
   ( Reader
   , ReaderT, ReaderT(ReaderT), runReaderT
+  , ask, local, reader
   )
 
 import Data.Bits as X

src/Postlude/Lazy.hs

@@ -5,13 +5,15 @@ module Postlude.Lazy
 ) where
 
 import Control.Monad.Trans.State as L
-  ( State
+  ( State, runState
   , StateT, StateT(StateT), runStateT
+  , get, put, state
   )
 
 import Control.Monad.Trans.Writer as L
-  ( Writer
+  ( Writer, runWriter
   , WriterT, WriterT(WriterT), runWriterT
+  , listen, pass, tell, writer
   )
 
 import Data.ByteString.Lazy as L

src/Postlude/Strict.hs

@@ -5,13 +5,15 @@ module Postlude.Strict
 ) where
 
 import Control.Monad.Trans.State.Strict as S
-  ( State
+  ( State, runState
   , StateT, StateT(StateT), runStateT
+  , get, put, state
   )
 
 import Control.Monad.Trans.Writer.Strict as S
-  ( Writer
+  ( Writer, runWriter
   , WriterT, WriterT(WriterT), runWriterT
+  , listen, pass, tell, writer
   )
 
 import Data.ByteString as S

stack.yaml

@@ -8,8 +8,7 @@
 # A snapshot resolver dictates the compiler version and the set of packages
 # to be used for project dependencies. For example:
 #
-# resolver: lts-3.5
-resolver: nightly-2018-03-14
+resolver: lts-14.17
 # resolver: ghc-7.10.2
 # resolver: ghcjs-0.1.0_ghc-7.10.2
 # resolver:

stack.yaml.lock

@@ -6,7 +6,7 @@
 packages: []
 snapshots:
 - completed:
-    size: 188042
-    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/nightly/2018/3/14.yaml
-    sha256: 2f1331f747e54e58abbc85754bacaf8dbd5a54444ee87d5757a2bafc0a4afa2f
-  original: nightly-2018-03-14
+    size: 524799
+    url: https://raw.githubusercontent.com/commercialhaskell/stackage-snapshots/master/lts/14/17.yaml
+    sha256: 1d72b33c0fc048e23f4f18fd76a6ad79dd1d8a3c054644098a71a09855e40c7c
+  original: lts-14.17