Imported Upstream version 3.6.0

Former-commit-id: da6be194a6b1221998fc28233f2503bd61dd9d14

mcs/tests/gtest-386.cs

@@ -0,0 +1,37 @@
+using System;
+using System.Linq.Expressions;
+
+public struct MyType
+{
+	int value;
+
+	public MyType (int value)
+	{
+		this.value = value;
+	}
+	public static MyType operator - (MyType a)
+	{
+		return new MyType (-a.value);
+	}
+}
+
+class C
+{
+	public static int Main ()
+	{
+		MyType? x = null;
+		MyType? y = -x;
+		
+		checked {
+			float? f = float.MinValue;
+			f = -f + 1;
+			int? i = int.MinValue;
+			try {
+				i = -i;
+				return 1;
+			} catch (OverflowException) { }
+		}		
+		
+		return 0;
+	}
+}