Support for GHC 9.12.1

src/Weeder/Main.hs

@@ -240,7 +240,10 @@ mainWithConfig hieExt hieDirectories requireHsFiles weederConfig = handleWeederE
 getHieFiles :: String -> [FilePath] -> Bool -> IO [HieFile]
 getHieFiles hieExt hieDirectories requireHsFiles = do
   let hiePat = "**/*." <> hieExtNoSep
-      hieExtNoSep = if isExtSeparator (head hieExt) then tail hieExt else hieExt
+      hieExtNoSep = case uncons hieExt of
+        Just (c0, hieExtNoSep')
+          | isExtSeparator c0 -> hieExtNoSep'
+        _ -> hieExt
 
   hieFilePaths :: [FilePath] <-
     concat <$>

src/Weeder/Run.hs

@@ -81,7 +81,7 @@ runWeeder weederConfig@Config{ rootPatterns, typeClassRoots, rootInstances, root
         else analyseEvidenceUses rf
 
     analysis1 =
-      foldl' mappend mempty analyses
+      Data.Foldable.foldl' mappend mempty analyses
 
     -- Evaluating 'analysis1' first allows us to begin analysis
     -- while hieFiles is still being read (since rf depends on all hie files)
@@ -129,7 +129,7 @@ runWeeder weederConfig@Config{ rootPatterns, typeClassRoots, rootInstances, root
               starts <- Map.lookup d ( declarationSites analysis )
               let locs = (,) packageName <$> Set.toList starts
               guard $ not $ null starts
-              return [ Map.singleton moduleFilePath ( liftA2 (,) locs (pure d) ) ]
+              return [ Map.singleton moduleFilePath ( Control.Applicative.liftA2 (,) locs (pure d) ) ]
         )
         dead
 

weeder.cabal

@@ -24,13 +24,13 @@ library
   build-depends:
     , algebraic-graphs     ^>= 0.7
     , async                ^>= 2.2.0
-    , base                 ^>= 4.17.0.0 || ^>= 4.18.0.0 || ^>= 4.19.0.0 || ^>= 4.20.0.0
+    , base                 ^>= 4.17.0.0 || ^>= 4.18.0.0 || ^>= 4.19.0.0 || ^>= 4.20.0.0 || ^>= 4.21.0.0
     , bytestring           ^>= 0.10.9.0 || ^>= 0.11.0.0 || ^>= 0.12.0.2
     , containers           ^>= 0.6.2.1 || ^>= 0.7
     , directory            ^>= 1.3.3.2
     , filepath             ^>= 1.4.2.1 || ^>= 1.5
     , generic-lens         ^>= 2.2.0.0
-    , ghc                  ^>= 9.4 || ^>= 9.6 || ^>= 9.8 || ^>= 9.10
+    , ghc                  ^>= 9.4 || ^>= 9.6 || ^>= 9.8 || ^>= 9.10 || ^>=9.12
     , Glob                 ^>= 0.9 || ^>= 0.10
     , lens                 ^>= 5.1 || ^>= 5.2 || ^>= 5.3
     , mtl                  ^>= 2.2.2 || ^>= 2.3