From 3db60b162a1e8482bb60f7638347de4cd7dc36f2 Mon Sep 17 00:00:00 2001
From: Adrien Duclos <adrien.duclos@fretlink.com>
Date: Fri, 30 Nov 2018 11:36:53 +0100
Subject: Bump to LTS 12.20

---
 Setup.hs                    |  3 +--
 src/Text/BlazeT/Internal.hs | 12 ++++++++----
 stack.yaml                  |  4 ++--
 3 files changed, 11 insertions(+), 8 deletions(-)

diff --git a/Setup.hs b/Setup.hs
index 7b0e237..f09d443 100644
--- a/Setup.hs
+++ b/Setup.hs
@@ -7,8 +7,7 @@ main = do
         haddockHoogle       = Flag True,
         haddockHtml         = Flag True,
         haddockProgramArgs  = [("-q",["aliased"])], -- does not seam to do anything
-        haddockExecutables  = Flag True,
-        haddockHscolour     = Flag True
+        haddockExecutables  = Flag True
         }
     }
 
diff --git a/src/Text/BlazeT/Internal.hs b/src/Text/BlazeT/Internal.hs
index f6f642a..feaf68f 100644
--- a/src/Text/BlazeT/Internal.hs
+++ b/src/Text/BlazeT/Internal.hs
@@ -188,13 +188,17 @@ wrapMarkup2 :: (Text.Blaze.Markup -> Text.Blaze.Markup) -> Markup2
 wrapMarkup2 = wrapMarkupT2
 {-# INLINE wrapMarkup2 #-}
 
+#if MIN_VERSION_base(4,11,0)
+instance (Monad m,Monoid a) => Semigroup (MarkupT m a) where
+  a <> b = do {a' <- a; b >>= return . (mappend a')}
+  {-# INLINE (<>) #-}
+#endif
 
-instance (Monad m,Monoid a) => Monoid (MarkupT m a) where
+instance (Functor m, Monad m,Monoid a) => Monoid (MarkupT m a) where
   mempty = return mempty
-  {-# INLINE mempty #-}
-  a `mappend` b = do {a' <- a; b >>= return . (mappend a')}
+  a `mappend` b = do {a' <- a; fmap (mappend a') b}
   {-# INLINE mappend #-}
-
+  {-# INLINE mempty #-}
 
 instance Monad m => Text.Blaze.Attributable (MarkupT m a) where
   h ! a = wrapMarkupT2 (Text.Blaze.! a) h
diff --git a/stack.yaml b/stack.yaml
index 397b67a..ddbf53b 100644
--- a/stack.yaml
+++ b/stack.yaml
@@ -15,7 +15,7 @@
 # resolver:
 #  name: custom-snapshot
 #  location: "./custom-snapshot.yaml"
-resolver: lts-7.15
+resolver: lts-12.20
 
 # User packages to be built.
 # Various formats can be used as shown in the example below.
@@ -63,4 +63,4 @@ extra-package-dbs: []
 # extra-lib-dirs: [/path/to/dir]
 #
 # Allow a newer minor version of GHC than the snapshot specifies
-# compiler-check: newer-minor
\ No newline at end of file
+# compiler-check: newer-minor
-- 
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