Fixed lifting for built-in relational operators.

ICSharpCode.NRefactory.CSharp/Resolver/CSharpOperators.cs

@@ -825,7 +825,9 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 			
 			public override OperatorMethod Lift(CSharpOperators operators)
 			{
-				return new LiftedBinaryOperatorMethod(operators, this);
+				var lifted = new LiftedBinaryOperatorMethod(operators, this);
+				lifted.ReturnType = this.ReturnType; // don't lift the return type for relational operators
+				return lifted;
 			}
 		}
 		

ICSharpCode.NRefactory.Tests/CSharp/Resolver/BinaryOperatorTests.cs

@@ -368,6 +368,9 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 			
 			AssertType(typeof(bool), resolver.ResolveBinaryOperator(
 				BinaryOperatorType.LessThan, MakeResult(typeof(int*)), MakeResult(typeof(uint*))));
+			
+			TestOperator(MakeResult(typeof(int?)), BinaryOperatorType.LessThan, MakeResult(typeof(int)),
+			             Conversion.IdentityConversion, Conversion.ImplicitNullableConversion, typeof(bool));
 		}
 		
 		[Test]