additional logging

src/dotnet/ForwardingApp.cs

@@ -80,6 +80,8 @@ namespace Microsoft.DotNet.Cli
                 UseShellExecute = false
             };
 
+            Reporter.Verbose.WriteLine($"[Forwarding] {processInfo.FileName} {processInfo.Arguments}");
+
             if (_environmentVariables != null)
             {
                 foreach (var entry in _environmentVariables)

src/dotnet/commands/dotnet-complete/CompleteCommand.cs

@@ -13,30 +13,36 @@ namespace Microsoft.DotNet.Cli
     public class CompleteCommand
     {
         public static int Run(string[] args)
+        {
+            try
             {
                 DebugHelper.HandleDebugSwitch(ref args);
 
                 // get the parser for the current subcommand
-            var completeCommandParser = Parser.DotnetCommand["complete"];
+                var parser = Parser.DotnetCommand["complete"];
 
                 // parse the arguments
-            var result = completeCommandParser.Parse(args);
+                var result = parser.Parse(args);
 
                 var complete = result["complete"];
 
                 var suggestions = Suggestions(complete);
 
-#if DEBUG
                 var log = new StringBuilder();
                 log.AppendLine($"args: {string.Join(" ", args.Select(a => $"\"{a}\""))}");
                 log.AppendLine("diagram: " + result.Diagram());
                 File.WriteAllText("parse.log", log.ToString());
-#endif
 
                 foreach (var suggestion in suggestions)
                 {
                     Console.WriteLine(suggestion);
                 }
+            }
+            catch (Exception e)
+            {
+                File.WriteAllText("dotnet completion exception.log", e.ToString());
+                throw;
+            }
 
             return 0;
         }