Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-587.cs

@@ -0,0 +1,51 @@
+using System;
+
+struct S
+{
+	public static implicit operator string (S s)
+	{
+		return "1";
+	}
+
+	public static implicit operator short? (S s)
+	{
+		return 1;
+	}
+
+	public static implicit operator E (S s)
+	{
+		return 0;
+	}
+}
+
+public enum E
+{
+}
+
+class C
+{
+	public static int Main ()
+	{
+		E? e = 0;
+		const E e1 = (E)44;
+		var res = e == e1;
+		if (res != false)
+			return 1;
+
+		res = e1 == e;
+		if (res != false)
+			return 2;
+
+		E e2 = 0;
+		S s;
+		var res2 = e2 & s;
+		if (res2 != 0)
+			return 3;
+
+		res2 = s & e2;
+		if (res2 != 0)
+			return 4;
+
+		return 0;
+	}
+}