Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0577.cs

@@ -0,0 +1,12 @@
+// CS0577: Conditional not valid on `MainClass.I.F()' because it is a constructor, destructor, operator or explicit interface implementation
+// Line: 10
+
+interface I
+{
+    void F ();
+}
+
+class MainClass: I {
+        [System.Diagnostics.Conditional("DEBUG")]
+        void I.F () {}
+}