Test #8542

testsuite/tests/numeric/should_compile/T8542.hs

+module T8542 where
+
+import GHC.Int
+
+x :: Int8
+x = -128
+
+y :: Int8
+y = 128

testsuite/tests/numeric/should_compile/T8542.stderr

+
+T8542.hs:6:6: Warning:
+    Literal 128 of type Int8 overflows
+    If you are attempting to write a negative literal, use NegativeLiterals
+
+T8542.hs:9:5: Warning:
+    Literal 128 of type Int8 overflows
+    If you are attempting to write a negative literal, use NegativeLiterals

testsuite/tests/numeric/should_compile/all.T

 test('T7116', normal, run_command, ['$MAKE -s --no-print-directory T7116'])
 test('T7895', normal, compile, [''])
 test('T7881', normal, compile, [''])
+test('T8542', normal, compile, [''])