testsuite: Add testcase for #21141

testsuite/tests/codeGen/should_run/T21141.hs

+{-# LANGUAGE BlockArguments #-}
+{-# LANGUAGE LambdaCase #-}
+
+module Main where
+
+import GHC.Prim.Exception
+import GHC.Exception.Type
+import Control.Exception
+import System.Mem
+
+main ::IO ()
+main = do
+  -- evaluate the CAF
+  evaluate raiseUnderflow
+    `catch` \case
+      Underflow -> pure ()
+      e         -> putStrLn "Unexpected exception"
+
+  -- free it with buggy compiler
+  performGC
+
+  -- reuse it
+  evaluate raiseUnderflow
+    `catch` \case
+      Underflow -> pure ()
+      e         -> putStrLn "Unexpected exception"

testsuite/tests/codeGen/should_run/all.T

@@ -216,6 +216,7 @@ test('CallConv', [when(unregisterised(), skip),
                   when(arch('x86_64'), extra_hc_opts('CallConv_x86_64.s')),
                   when(arch('aarch64'), extra_hc_opts('CallConv_aarch64.s'))],
      compile_and_run, [''])
+test('T21141', normal, compile_and_run, [''])
 test('T21186', normal, compile_and_run, [''])
 test('T20640a', normal, compile_and_run, [''])
 test('T20640b', normal, compile_and_run, [''])