Imported Upstream version 4.6.0.125

Former-commit-id: a2155e9bd80020e49e72e86c44da02a8ac0e57a4

mcs/tests/test-null-operator-04.cs

@@ -0,0 +1,55 @@
+using System;
+
+interface IFoo<T>
+{
+	T Call ();
+}
+
+class C1
+{
+	public void Foo<T> (IFoo<T> t) where T : class
+	{
+		t?.Call ();
+		var x = t?.Call ();
+	}
+
+	public void Foo2<T> (IFoo<T> t)
+	{
+		t?.Call ();
+	}	
+}
+
+class C2<T> where T : class
+{
+	C2<T> i;
+	T field;
+
+	public void Foo ()
+	{
+		var x = i?.field;
+	}
+}
+
+class Program
+{
+	static void Test<T>(Func<T> func) where T : struct
+	{
+		var r = func?.Invoke ();
+	}
+
+	static void Test2<T>(Func<T> func)
+	{
+		func?.Invoke ();
+	}
+
+	static void Main()
+	{
+		new C1 ().Foo<Program> (null);
+		new C1 ().Foo2<Program> (null);
+
+		new C2<string> ().Foo ();
+
+		Test (() => 1);
+		Test (() => 2);
+	}
+}