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-rw-r--r--compiler/GHC/HsToCore/Quote.hs9
-rw-r--r--testsuite/tests/th/T20711.hs11
-rw-r--r--testsuite/tests/th/T20711.stdout2
-rw-r--r--testsuite/tests/th/all.T1
4 files changed, 22 insertions, 1 deletions
diff --git a/compiler/GHC/HsToCore/Quote.hs b/compiler/GHC/HsToCore/Quote.hs
index 34282ec363..215b8f4da8 100644
--- a/compiler/GHC/HsToCore/Quote.hs
+++ b/compiler/GHC/HsToCore/Quote.hs
@@ -2077,7 +2077,14 @@ repP (ConPat NoExtField dc details)
repP (NPat _ (L _ l) Nothing _) = do { a <- repOverloadedLiteral l
; repPlit a }
repP (ViewPat _ e p) = do { e' <- repLE e; p' <- repLP p; repPview e' p' }
-repP p@(NPat _ _ (Just _) _) = notHandled (ThNegativeOverloadedPatterns p)
+repP p@(NPat _ (L _ l) (Just _) _)
+ | OverLitRn rebindable _ <- ol_ext l
+ , rebindable = notHandled (ThNegativeOverloadedPatterns p)
+ | HsIntegral i <- ol_val l = do { a <- repOverloadedLiteral l{ol_val = HsIntegral (negateIntegralLit i)}
+ ; repPlit a }
+ | HsFractional i <- ol_val l = do { a <- repOverloadedLiteral l{ol_val = HsFractional (negateFractionalLit i)}
+ ; repPlit a }
+ | otherwise = notHandled (ThExoticPattern p)
repP (SigPat _ p t) = do { p' <- repLP p
; t' <- repLTy (hsPatSigType t)
; repPsig p' t' }
diff --git a/testsuite/tests/th/T20711.hs b/testsuite/tests/th/T20711.hs
new file mode 100644
index 0000000000..f18b672ab5
--- /dev/null
+++ b/testsuite/tests/th/T20711.hs
@@ -0,0 +1,11 @@
+{-# LANGUAGE TemplateHaskell #-}
+module Main where
+
+import Language.Haskell.TH
+
+main :: IO ()
+main = do
+ x <- [d| f (-1) = () |]
+ putStrLn $ pprint x
+ y <- [d| f (-10) = () |]
+ putStrLn $ pprint y
diff --git a/testsuite/tests/th/T20711.stdout b/testsuite/tests/th/T20711.stdout
new file mode 100644
index 0000000000..f14e7b3479
--- /dev/null
+++ b/testsuite/tests/th/T20711.stdout
@@ -0,0 +1,2 @@
+f_0 (-1) = GHC.Tuple.()
+f_0 (-10) = GHC.Tuple.()
diff --git a/testsuite/tests/th/all.T b/testsuite/tests/th/all.T
index 165ef6a7e2..01a64a3848 100644
--- a/testsuite/tests/th/all.T
+++ b/testsuite/tests/th/all.T
@@ -548,3 +548,4 @@ test('T21038', normal, compile, [''])
test('T20842', normal, compile_and_run, [''])
test('T15433a', [extra_files(['T15433_aux.hs'])], multimod_compile_fail, ['T15433a', '-v0'])
test('T15433b', [extra_files(['T15433_aux.hs'])], multimod_compile, ['T15433b', '-v0'])
+test('T20711', normal, compile_and_run, [''])