Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/errors/cs0104-4.cs

@@ -0,0 +1,25 @@
+// CS0104: `XAttribute' is an ambiguous reference between `A.XAttribute' and `B.XAttribute'
+// Line: 21
+
+using System;
+
+namespace A
+{
+	class XAttribute : Attribute { }
+}
+
+namespace B
+{
+	class XAttribute : Attribute { }
+}
+
+namespace C
+{
+	using A;
+	using B;
+
+	[X]
+	class Test 
+	{
+	}
+}