Fix PostfixOperators (#18151)

This fixes a regression introduced in 2b89ca5b850b4097447cc4908cbb0631011ce979
See the new T18151x test case.

3 files changed, 19 insertions, 0 deletions

diff --git a/testsuite/tests/deSugar/should_run/T18151x.hs b/testsuite/tests/deSugar/should_run/T18151x.hs
new file mode 100644
index 0000000000..213ca9969f
--- /dev/null
+++ b/testsuite/tests/deSugar/should_run/T18151x.hs
@@ -0,0 +1,17 @@
+{-# LANGUAGE PostfixOperators #-}
+
+import Control.Exception
+
+data MyException = MyE
+  deriving (Show)
+
+instance Exception MyException
+
+(#) :: Bool -> Bool -> Bool
+(#) = throw MyE
+
+main = do
+  r <- try (evaluate (seq (True #) ()))
+  case r of
+    Left MyE -> putStrLn "PostfixOperators ok"
+    Right () -> putStrLn "PostfixOperators broken"
diff --git a/testsuite/tests/deSugar/should_run/T18151x.stdout b/testsuite/tests/deSugar/should_run/T18151x.stdout
new file mode 100644
index 0000000000..cbd3ad0a5b
--- /dev/null
+++ b/testsuite/tests/deSugar/should_run/T18151x.stdout
@@ -0,0 +1 @@
+PostfixOperators ok
diff --git a/testsuite/tests/deSugar/should_run/all.T b/testsuite/tests/deSugar/should_run/all.T
index 2df9586b7d..406cb24863 100644
--- a/testsuite/tests/deSugar/should_run/all.T
+++ b/testsuite/tests/deSugar/should_run/all.T
@@ -65,6 +65,7 @@ test('T11747', normal, compile_and_run, ['-dcore-lint'])
 test('T12595', normal, compile_and_run, [''])
 test('T13285', normal, compile_and_run, [''])
 test('T18151', normal, compile_and_run, [''])
+test('T18151x', normal, compile_and_run, [''])
 test('T18172', [], ghci_script, ['T18172.script'])
 
 test('DsDoExprFailMsg', exit_code(1), compile_and_run, [''])