[Git][ghc/ghc][wip/validate-fix-werror] 3 commits: ghc-internal: fix unused imports

21 Mar 2026


      Cheng Shao pushed to branch wip/validate-fix-werror at Glasgow Haskell Compiler / GHC


Commits:
e4b9a189 by Cheng Shao at 2026-03-21T00:31:34+01:00
ghc-internal: fix unused imports

This commit fixes unused imports in `ghc-internal` which should have
been caught by the `validate` flavour but was warnings in CI due to
the recent `+werror` regression. Fixes #26987 #27059.

- - - - -
6d1798de by Cheng Shao at 2026-03-21T00:31:40+01:00
compiler: fix unused imports in GHC.Tc.Types.Origin

This commit fixes unused imports in `GHC.Tc.Types.Origin` which should
have been caught by the `validate` flavour but was warnings in CI due
to the recent `+werror` regression. Fixes #27059.

- - - - -
c2130e19 by Cheng Shao at 2026-03-21T00:31:40+01:00
hadrian: fix missing +werror in validate flavour

This patch fixes missing `+werror` in validate flavour, which was an
oversight in bb3a2ba1eefadf0b2ef4f39b31337a23eec67f29. Fixes #27066.

- - - - -


16 changed files:

- compiler/GHC/Tc/Types/Origin.hs
- hadrian/src/Settings/Flavours/Validate.hs
- libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
- libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
- libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
- libraries/ghc-internal/src/GHC/Internal/Float.hs
- libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
- libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
- libraries/ghc-internal/src/GHC/Internal/Int.hs
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
- libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
- libraries/ghc-internal/src/GHC/Internal/System/Environment.hs
- libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc
- libraries/ghc-internal/src/GHC/Internal/System/IO.hs
- libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
- libraries/ghc-internal/src/GHC/Internal/TopHandler.hs


Changes:

=====================================
compiler/GHC/Tc/Types/Origin.hs
=====================================
@@ -83,7 +83,6 @@ import qualified Data.Kind as Hs
 import Data.List.NonEmpty (NonEmpty (..))
 import Data.Maybe (isNothing)
 import qualified Data.Semigroup as Semi
-import GHC.Generics
 
 {- *********************************************************************
 *                                                                      *


=====================================
hadrian/src/Settings/Flavours/Validate.hs
=====================================
@@ -8,7 +8,7 @@ import {-# SOURCE #-} Settings.Default
 
 -- Please update doc/flavours.md when changing this file.
 validateFlavour :: Flavour
-validateFlavour = enableLinting $ quickValidateFlavour
+validateFlavour = enableLinting $ werror $ quickValidateFlavour
     { name = "validate"
     , extraArgs = validateArgs <> defaultHaddockExtraArgs
     , ghcDebugAssertions = (<= Stage1)


=====================================
libraries/ghc-internal/src/GHC/Internal/Conc/IO.hs
=====================================
@@ -58,7 +58,7 @@ module GHC.Internal.Conc.IO
 #endif
         ) where
 
-import GHC.Internal.Base (otherwise, pure, return, ($))
+import GHC.Internal.Base (otherwise, return, ($))
 import GHC.Internal.Conc.Sync as Sync
 import GHC.Internal.Err (errorWithoutStackTrace)
 import GHC.Internal.STM as STM
@@ -82,6 +82,10 @@ import qualified GHC.Internal.Wasm.Prim.Conc as Wasm
 import qualified GHC.Internal.Wasm.Prim.Flag as Wasm
 #endif
 
+#if defined(javascript_HOST_ARCH)
+import GHC.Internal.Base (pure)
+#endif
+
 ensureIOManagerIsRunning :: IO ()
 #if defined(javascript_HOST_ARCH)
 ensureIOManagerIsRunning = pure ()


=====================================
libraries/ghc-internal/src/GHC/Internal/Event/Control.hs
=====================================
@@ -29,7 +29,7 @@ module GHC.Internal.Event.Control
 #include <ghcplatform.h>
 #include "EventConfig.h"
 
-import GHC.Internal.Base (fmap, otherwise, pure, return, when, ($), (.))
+import GHC.Internal.Base (fmap, otherwise, return, when, ($), (.))
 import GHC.Internal.Classes (Eq(..), (&&))
 import GHC.Internal.IORef
 import GHC.Internal.Conc.Signal (Signal)
@@ -56,6 +56,10 @@ import GHC.Internal.Foreign.C.Types (CULLong(..))
 import GHC.Internal.Foreign.C.Error (eAGAIN, eWOULDBLOCK, eBADF)
 #endif
 
+#if defined(wasm32_HOST_ARCH)
+import GHC.Internal.Base (pure)
+#endif
+
 data ControlMessage = CMsgWakeup
                     | CMsgDie
                     | CMsgSignal {-# UNPACK #-} !(ForeignPtr Word8)


=====================================
libraries/ghc-internal/src/GHC/Internal/Event/KQueue.hsc
=====================================
@@ -33,7 +33,7 @@ import GHC.Internal.Data.Bits (Bits(..), FiniteBits(..))
 import GHC.Internal.Err (errorWithoutStackTrace, undefined)
 import GHC.Internal.Int
 import GHC.Internal.Data.Maybe (Maybe(..), catMaybes)
-import GHC.Internal.Types (Bool(..), Int, IO)
+import GHC.Internal.Types (Bool(..), IO)
 import GHC.Internal.Word (Word16, Word32)
 import GHC.Internal.Foreign.C.Error (throwErrnoIfMinus1, eINTR, eINVAL,
                         eNOTSUP, getErrno, throwErrno)


=====================================
libraries/ghc-internal/src/GHC/Internal/Float.hs
=====================================
@@ -185,12 +185,12 @@ import GHC.Internal.Prim (
     decodeFloat_Int#, divideFloat#, double2Float#, eqWord#, expDouble#,
     expFloat#, expm1Double#, expm1Float#, fabsDouble#, fabsFloat#,
     float2Double#, geFloat#, gtFloat#, gtWord#, int2Float#, int2Double#,
-    int2Word#, int64ToInt#, leFloat#, log1pDouble#, log1pFloat#, logDouble#,
+    int2Word#, leFloat#, log1pDouble#, log1pFloat#, logDouble#,
     logFloat#, ltFloat#, ltWord#, minusFloat#, minusWord#, negateDouble#,
     negateFloat#, negateInt#, plusFloat#, powerFloat#, sinDouble#, sinFloat#,
     sinhDouble#, sinhFloat#, sqrtDouble#, sqrtFloat#, tanDouble#, tanFloat#,
     tanhDouble#, tanhFloat#, timesFloat#, uncheckedIShiftRA#, uncheckedShiftL#,
-    word2Float#, word2Double#, word2Int#, word64ToWord#,
+    word2Float#, word2Double#, word2Int#,
     (+#), (+##), (-#), (-##), (*##), (**##), (/##), (<#), (<##), (<=#), (<=##),
     (>#), (>##), (>=#), (>=##),
   )
@@ -206,6 +206,13 @@ import GHC.Internal.Float.RealFracMethods
 import GHC.Internal.Float.ConversionUtils
 import GHC.Internal.Bignum.BigNat
 
+#if WORD_SIZE_IN_BITS == 64
+import GHC.Internal.Prim (
+    int64ToInt#,
+    word64ToWord#,
+  )
+#endif
+
 infixr 8  **
 
 -- $setup


=====================================
libraries/ghc-internal/src/GHC/Internal/Float/RealFracMethods.hs
=====================================
@@ -66,7 +66,7 @@ import GHC.Internal.Classes (Ord(..))
 import GHC.Internal.Num () -- instance Num Integer
                            -- (We could remove uses with a little effort)
 import GHC.Internal.Prim (
-    Int#, eqFloat#, decodeFloat_Int#, double2Int#, float2Int#, int2Float#,
+    eqFloat#, decodeFloat_Int#, double2Int#, float2Int#, int2Float#,
     int2Double#, int2Word#, ltFloat#, minusFloat#, negateFloat#, negateDouble#,
     negateInt#, uncheckedIShiftL#, uncheckedIShiftRA#, uncheckedIShiftRL#,
     (+#), (-#), (<#), (>#), (-##), (==##), (<##),
@@ -86,6 +86,10 @@ import GHC.Internal.Prim (
 
 #else
 
+import GHC.Internal.Prim (
+    Int#,
+  )
+
 #define TO64 integerToInt#
 #define FROM64 IS
 #define MINUS64 ( -# )
@@ -355,4 +359,3 @@ foreign import ccall unsafe "rintDouble"
 
 foreign import ccall unsafe "rintFloat"
     c_rintFloat :: Float -> Float
-


=====================================
libraries/ghc-internal/src/GHC/Internal/IO/FD.hs
=====================================
@@ -30,7 +30,7 @@ module GHC.Internal.IO.FD (
     ) where
 
 import GHC.Internal.Base (
-    String, fmap, id, otherwise, pure, return, when, ($), (.), (++), (>>=),
+    String, fmap, otherwise, pure, return, when, ($), (.), (++), (>>=),
   )
 import GHC.Internal.Bits
 import GHC.Internal.Classes (Eq(..), Ord(..), not, (&&), (||))
@@ -58,6 +58,10 @@ import GHC.Internal.Err (error)
 import GHC.Internal.Windows
 import GHC.Internal.IO.SubSystem ((<!>))
 import GHC.Internal.Foreign.Storable
+#else
+import GHC.Internal.Base (
+    id,
+  )
 #endif
 
 import GHC.Internal.Foreign.C.Types


=====================================
libraries/ghc-internal/src/GHC/Internal/Int.hs
=====================================
@@ -51,7 +51,7 @@ import GHC.Internal.Classes (
     Eq(..), Ord(..),
     eqInt, neInt, gtInt, geInt, ltInt, leInt,
     divInt8#, divInt16#, divInt32#,
-    divModInt8#, divModInt16#, divModInt32#, divModInt#,
+    divModInt8#, divModInt16#, divModInt32#,
     modInt8#, modInt16#, modInt32#,
     (&&), (||),
   )
@@ -63,6 +63,12 @@ import GHC.Internal.Arr
 import GHC.Internal.Show
 import GHC.Internal.Types (Bool(..), Float, Double, Int(..), isTrue#)
 
+#if WORD_SIZE_IN_BITS == 64
+import GHC.Internal.Classes (
+    divModInt#,
+  )
+#endif
+
 ------------------------------------------------------------------------
 -- type Int8
 ------------------------------------------------------------------------


=====================================
libraries/ghc-internal/src/GHC/Internal/RTS/Flags.hsc
=====================================
@@ -66,7 +66,7 @@ import GHC.Internal.Ptr
 import GHC.Internal.Types (Bool(..), Double, Int)
 import GHC.Internal.Word
 import GHC.Internal.Base (
-    String, otherwise, pure, return, (.), (++), (<*>), (=<<),
+    String, otherwise, return, (.), (++), (<*>), (=<<),
   )
 import GHC.Internal.Enum
 import GHC.Internal.Generics (Generic)
@@ -74,6 +74,10 @@ import GHC.Internal.IO
 import GHC.Internal.Real
 import GHC.Internal.Show
 
+#if defined(javascript_HOST_ARCH)
+import GHC.Internal.Base (pure)
+#endif
+
 -- | 'RtsTime' is defined as a @StgWord64@ in @stg/Types.h@
 --
 -- @since base-4.8.2.0


=====================================
libraries/ghc-internal/src/GHC/Internal/RTS/Flags/Test.hsc
=====================================
@@ -8,16 +8,20 @@ module GHC.Internal.RTS.Flags.Test
   )
 where
 
-import GHC.Internal.Base (pure)
 import GHC.Internal.Ptr
-import GHC.Internal.Foreign.C.Types
-import GHC.Internal.Foreign.Marshal.Utils
 import GHC.Internal.Foreign.Storable
 import GHC.Internal.Data.Functor ((<$>))
 import GHC.Internal.Types (Bool(..), Int, IO)
 import GHC.Internal.Word (Word32)
 import GHC.Internal.Real (fromIntegral)
 
+#if defined(javascript_HOST_ARCH)
+import GHC.Internal.Base (pure)
+#else
+import GHC.Internal.Foreign.C.Types
+import GHC.Internal.Foreign.Marshal.Utils
+#endif
+
 #include "Rts.h"
 #include "rts/Flags.h"
 


=====================================
libraries/ghc-internal/src/GHC/Internal/System/Environment.hs
=====================================
@@ -49,9 +49,13 @@ import GHC.Internal.Base (fmap)
 import GHC.Internal.Classes (Ord(..))
 import GHC.Internal.Control.Exception.Base (bracket)
 import GHC.Internal.Err (undefined)
+#else
+import GHC.Internal.Base (
+    map, (++),
+  )
 #endif
 import GHC.Internal.Base (
-    String, liftM, map, mapM, otherwise, return, ($), (.), (++), (>>=),
+    String, liftM, mapM, otherwise, return, ($), (.), (>>=),
   )
 import GHC.Internal.List (null, elem, takeWhile, break)
 import GHC.Internal.Maybe (Maybe(..))


=====================================
libraries/ghc-internal/src/GHC/Internal/System/Environment/Blank.hsc
=====================================
@@ -43,7 +43,7 @@ import GHC.Internal.Classes (Eq(..))
 import GHC.Internal.Data.Functor
 import GHC.Internal.Data.List (elem, null, takeWhile)
 import GHC.Internal.Foreign.C.String
-import GHC.Internal.Base (String, otherwise, return, ($))
+import GHC.Internal.Base (String, otherwise, ($))
 #if defined(mingw32_HOST_OS)
 import GHC.Internal.Base ((.))
 import GHC.Internal.Foreign.Ptr
@@ -51,6 +51,7 @@ import GHC.Internal.Windows
 import GHC.Internal.Control.Monad
 import GHC.Internal.Data.List (lookup)
 #else
+import GHC.Internal.Base (return)
 import GHC.Internal.Foreign.C.Error
 import GHC.Internal.Foreign.C.Types
 import GHC.Internal.Real (fromIntegral)


=====================================
libraries/ghc-internal/src/GHC/Internal/System/IO.hs
=====================================
@@ -249,6 +249,7 @@ import GHC.Internal.Base (String, failIO, otherwise, return, ($), (.), (>>=))
 import GHC.Internal.List
 #if !defined(mingw32_HOST_OS)
 import GHC.Internal.IORef
+import GHC.Internal.Types (Int)
 #endif
 import GHC.Internal.Num
 import GHC.Internal.IO hiding ( bracket, onException )
@@ -262,7 +263,7 @@ import GHC.Internal.IO.Encoding
 import GHC.Internal.Text.Read
 import GHC.Internal.IO.StdHandles
 import GHC.Internal.Show
-import GHC.Internal.Types (Bool(..), Char, Int)
+import GHC.Internal.Types (Bool(..), Char)
 -----------------------------------------------------------------------------
 -- Standard IO
 


=====================================
libraries/ghc-internal/src/GHC/Internal/System/Posix/Internals.hs
=====================================
@@ -46,19 +46,20 @@ import GHC.Internal.Data.Maybe
 
 #if !defined(HTYPE_TCFLAG_T)
 import GHC.Internal.System.IO.Error
+#if !defined(mingw32_HOST_OS)
+import GHC.Internal.Err (errorWithoutStackTrace)
+#endif
 #endif
 
 import GHC.Internal.Base (
     String, otherwise, pure, return, when, ($), (++), (>>=),
   )
 import GHC.Internal.Bits
-import GHC.Internal.Classes (Eq(..), Ord(..), not, (&&), (||))
-import GHC.Internal.CString (cstringLength#)
-import GHC.Internal.Err (errorWithoutStackTrace)
+import GHC.Internal.Classes (Eq(..), not, (&&), (||))
 import GHC.Internal.Num
 import GHC.Internal.Prim (yield#)
 import GHC.Internal.Real
-import GHC.Internal.Types (Bool(..), Int(..))
+import GHC.Internal.Types (Bool(..))
 import GHC.Internal.Word
 import GHC.Internal.IO
 import GHC.Internal.IO.IOMode
@@ -71,10 +72,13 @@ import GHC.Internal.Int (Int64)
 #endif
 
 #if !defined(mingw32_HOST_OS)
+import GHC.Internal.CString (cstringLength#)
+import GHC.Internal.Classes (Ord(..))
 import {-# SOURCE #-} GHC.Internal.IO.Encoding (getFileSystemEncoding)
 import GHC.Internal.Foreign.Marshal.Utils
 import GHC.Internal.Foreign.Storable
 import qualified GHC.Internal.Foreign.C.String.Encoding as GHC
+import GHC.Internal.Types (Int(..))
 #else
 import GHC.Internal.Int
 import GHC.Internal.Data.OldList (elem)


=====================================
libraries/ghc-internal/src/GHC/Internal/TopHandler.hs
=====================================
@@ -39,12 +39,12 @@ module GHC.Internal.TopHandler (
 import GHC.Internal.Control.Exception
 import GHC.Internal.Data.Maybe
 
-import GHC.Internal.Classes (Eq(..), Ord(..), (&&))
+import GHC.Internal.Classes (Eq(..))
 import GHC.Internal.Foreign.C.Error
 import GHC.Internal.Foreign.C.Types
 import GHC.Internal.Foreign.C.String
 import GHC.Internal.Base (
-    String, const, failIO, otherwise, pure, return, ($), (++), (>>),
+    String, failIO, return, ($), (++), (>>),
   )
 import GHC.Internal.Conc.Sync hiding (throwTo)
 import GHC.Internal.Prim (Weak#, seq)
@@ -67,6 +67,17 @@ import GHC.Internal.Conc.Signal
 import GHC.Internal.Data.Dynamic (toDyn)
 #endif
 
+#if !defined(HAVE_SIGNAL_H)
+import GHC.Internal.Base (pure)
+#endif
+
+#if !defined(mingw32_HOST_OS) && !defined(javascript_HOST_ARCH)
+import GHC.Internal.Base (
+    const, otherwise,
+  )
+import GHC.Internal.Classes (Ord(..), (&&))
+#endif
+
 -- Note [rts_setMainThread must be called unsafely]
 -- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 -- rts_setMainThread must be called as unsafe, because it



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Cheng Shao (＠TerrorJack)

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