Add llvm-hs-pretty package

Fix prettyprinter version conflict

cabal.project

@@ -0,0 +1,7 @@
+-- Needed to get a working version of llvm-hs-pretty
+-- The one on hackage is broken with this version of GHC
+source-repository-package
+    type: git
+    location: https://github.com/rumkeller/llvm-hs-pretty.git
+
+packages: ./windows12.cabal

src/Main.hs

@@ -3,7 +3,7 @@
 module Main where
 
 import qualified Data.Text.IO as T
-import Prettyprinter
+import Data.Text.Prettyprint.Doc (pretty)
 import Text.Megaparsec (parse)
 import Windows12.Parser (programP)
 

src/Windows12/Ast.hs

@@ -3,7 +3,7 @@
 module Windows12.Ast where
 
 import Data.Text (Text)
-import Prettyprinter
+import Data.Text.Prettyprint.Doc
 
 data BinOp
   = Add

windows12.cabal

@@ -76,10 +76,11 @@ executable windows12
     build-depends:
         base >= 4.15.1 && < 4.16,
         llvm-hs-pure >= 9.0.0 && < 9.1,
+        llvm-hs-pretty >= 0.9.0 && < 0.10,
         megaparsec >= 9.6.1 && < 9.7,
         text >= 1.2.5 && < 1.3,
         parser-combinators >= 1.3.0 && < 1.4,
-        prettyprinter >= 1.7.1 && < 1.8,
+        prettyprinter >= 1.5.1 && < 1.6,
 
     -- Directories containing source files.
     hs-source-dirs:   src