Extract the lambda into its own method.

src/Generator/Driver.cs

@@ -49,12 +49,7 @@ namespace Cxxi
             }
         }
 
-        public void ParseCode()
+        private void OnHeaderParsed(string file, ParserResult result)
-        {
-            Console.WriteLine("Parsing code...");
-
-            var parser = new Parser(Options);
-            parser.HeaderParsed += (file, result) =>
         {
             switch (result.Kind)
             {
@@ -69,6 +64,17 @@ namespace Cxxi
                     break;
             }
 
+            foreach (var diag in result.Diagnostics)
+                Console.WriteLine("    {0}", diag);
+        }
+
+        public void ParseCode()
+        {
+            Console.WriteLine("Parsing code...");
+
+            var parser = new Parser(Options);
+            parser.HeaderParsed += OnHeaderParsed;
+
             parser.ParseHeaders(Options.Headers);
             Library = parser.Library;
         }