[mcs] Convert extended underlying enum constants to their underlying type. Fixes #18866

1 files changed, 31 insertions, 0 deletions

diff --git a/mcs/tests/test-889.cs b/mcs/tests/test-889.cs
new file mode 100644
index 00000000000..0ba66e45208
--- /dev/null
+++ b/mcs/tests/test-889.cs
@@ -0,0 +1,31 @@
+class Test
+{
+    public enum Ebyte : byte
+    {
+        Mask = 1
+    }
+
+    public enum Esbyte : sbyte
+    {
+        Mask = -127
+    }
+
+    public enum Eshort : short
+    {
+        Mask = 1
+    }
+
+    public enum Eushort : ushort
+    {
+        Mask = 1
+    }
+
+    static void Main ()
+    {
+        byte v1 = (byte)(~Ebyte.Mask);
+        sbyte v2 = (sbyte)(~Esbyte.Mask);
+
+        short v3 = (short)(~Eshort.Mask);
+        ushort v4 = (ushort)(~Eushort.Mask);
+    }
+}
\ No newline at end of file