Imported Upstream version 3.10.0

Former-commit-id: 172c8e3c300b39d5785c7a3e8dfb08ebdbc1a99b

mcs/errors/cs0021-5.cs

@@ -0,0 +1,12 @@
+// CS0021: Cannot apply indexing with [] to an expression of type `object'
+// Line: 9
+
+class C
+{
+	public static void Main ()
+	{
+		var d = new object {
+			["a"] = 1
+		};
+	}
+}