Imported Upstream version 4.0.0~alpha1

Former-commit-id: 806294f5ded97629b74c85c09952f2a74fe182d9

mcs/errors/cs0126-3.cs

@@ -0,0 +1,26 @@
+// CS0126: An object of a type convertible to `int' is required for the return statement
+// Line: 15
+
+using System.Threading.Tasks;
+
+class MainClass
+{
+    public static void Main ()
+    {
+        Task<C> v = null;
+
+        Task.Run (async () => {
+            await Task.Yield ();
+            if (v == null) {
+                return;
+            }
+
+            return 1;
+        });
+    }
+}
+
+public class C
+{
+    string Id { get; set; }
+}