Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

mcs/errors/cs8091.cs

@@ -0,0 +1,17 @@
+// CS8091: `Test.Test()': Contructors cannot be extern and have a constructor initializer
+// Line: 16
+
+public class A
+{
+    public A (int arg)
+    {
+    }
+}
+
+public class Test : A
+{
+	int prop = 1;
+
+	public extern Test ()
+		: base (1);
+}