Add IMember.UnresolvedMember property.

ICSharpCode.NRefactory.CSharp/Resolver/CSharpOperators.cs

@@ -127,6 +127,10 @@ namespace ICSharpCode.NRefactory.CSharp.Resolver
 				get { return this; }
 			}
 			
+			IUnresolvedMember IMember.UnresolvedMember {
+				get { return null; }
+			}
+			
 			IList<IMember> IMember.InterfaceImplementations {
 				get { return EmptyList<IMember>.Instance; }
 			}

ICSharpCode.NRefactory.Tests/TypeSystem/TypeSystemTests.TestCase.cs

@@ -153,7 +153,7 @@ namespace ICSharpCode.NRefactory.TypeSystem.TestCase
 	public class OuterGeneric<X>
 	{
 		public class Inner {
-			OuterGeneric<X> referenceToOuter;
+			public OuterGeneric<X> referenceToOuter;
 			public Inner(OuterGeneric<X> referenceToOuter) {}
 		}
 		

ICSharpCode.NRefactory/TypeSystem/IMember.cs

@@ -84,9 +84,21 @@ namespace ICSharpCode.NRefactory.TypeSystem
 		/// </summary>
 		IMember MemberDefinition { get; }
 		
+		/// <summary>
+		/// Gets the unresolved member instance from which this member was created.
+		/// This property may return <c>null</c> for special members that do not have a corresponding unresolved member instance.
+		/// </summary>
+		/// <remarks>
+		/// For specialized members, this property returns the unresolved member for the original member definition.
+		/// For partial methods, this property returns the implementing partial method declaration, if one exists, and the
+		/// defining partial method declaration otherwise.
+		/// For the members used to represent the built-in C# operators like "operator +(int, int);", this property returns <c>null</c>.
+		/// </remarks>
+		IUnresolvedMember UnresolvedMember { get; }
+		
 		/// <summary>
 		/// Gets the return type of this member.
-		/// This property never returns null.
+		/// This property never returns <c>null</c>.
 		/// </summary>
 		IType ReturnType { get; }
 		

ICSharpCode.NRefactory/TypeSystem/Implementation/AbstractResolvedMember.cs

@@ -47,6 +47,10 @@ namespace ICSharpCode.NRefactory.TypeSystem.Implementation
 			}
 		}
 		
+		public IUnresolvedMember UnresolvedMember {
+			get { return unresolved; }
+		}
+		
 		public IList<IMember> InterfaceImplementations {
 			get {
 				throw new NotImplementedException();

ICSharpCode.NRefactory/TypeSystem/Implementation/SpecializedMember.cs

@@ -75,7 +75,11 @@ namespace ICSharpCode.NRefactory.TypeSystem.Implementation
 		}
 		
 		public IMember MemberDefinition {
-			get { return memberDefinition; }
+			get { return memberDefinition.MemberDefinition; }
+		}
+		
+		public IUnresolvedMember UnresolvedMember {
+			get { return memberDefinition.UnresolvedMember; }
 		}
 		
 		public IType ReturnType {