Fixed resolve at location failure.

Was caused by an invalid token location.

ICSharpCode.NRefactory.CSharp/Parser/CSharpParser.cs

@@ -213,6 +213,7 @@ namespace ICSharpCode.NRefactory.CSharp
 					
 					var memberType = new MemberType ();
 					memberType.AddChild (ConvertToType (ma.LeftExpression), MemberType.TargetRole);
+					if (!ma.DotLocation.IsNull)
 						memberType.AddChild (new CSharpTokenNode (Convert (ma.DotLocation), Roles.Dot), Roles.Dot);
 					
 					memberType.MemberNameToken = Identifier.Create (ma.Name, Convert (ma.Location));

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

@@ -238,5 +238,17 @@ class Test {
 			Assert.AreEqual("Method", rr.Member.Name);
 			Assert.AreEqual(0, ((IMethod)rr.Member).Parameters.Count);
 		}
+
+		[Test]
+		public void MemberTypeTarget()
+		{
+			var rr = ResolveAtLocation<TypeResolveResult>(
+				@"using System;                                                                   
+class Test {
+	E$nvironment.SpecialFolder folder;
+}
+");
+			Assert.AreEqual("System.Environment", rr.Type.FullName);
+		}
 	}
 }