From 421d2c411a06e2f5e5fd1e03e439c27df73cefc6 Mon Sep 17 00:00:00 2001
From: Jan Tattermusch <jtattermusch@google.com>
Date: Thu, 19 May 2016 21:36:09 -0700
Subject: [PATCH] add TODOs and remove unused imports

---
 src/csharp/Grpc.Core/Internal/AsyncCall.cs | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/src/csharp/Grpc.Core/Internal/AsyncCall.cs b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
index fabe4e757fd..b50580c40f0 100644
--- a/src/csharp/Grpc.Core/Internal/AsyncCall.cs
+++ b/src/csharp/Grpc.Core/Internal/AsyncCall.cs
@@ -32,12 +32,7 @@
 #endregion
 
 using System;
-using System.Diagnostics;
-using System.Runtime.CompilerServices;
-using System.Runtime.InteropServices;
-using System.Threading;
 using System.Threading.Tasks;
-using Grpc.Core.Internal;
 using Grpc.Core.Logging;
 using Grpc.Core.Profiling;
 using Grpc.Core.Utils;
@@ -57,9 +52,11 @@ namespace Grpc.Core.Internal
         // Completion of a pending unary response if not null.
         TaskCompletionSource<TResponse> unaryResponseTcs;
 
+        // TODO(jtattermusch): this field doesn't need to be initialized for unary response calls.
         // Indicates that response streaming call has finished.
         TaskCompletionSource<object> streamingCallFinishedTcs = new TaskCompletionSource<object>();
 
+        // TODO(jtattermusch): this field could be lazy-initialized (only if someone requests the response headers).
         // Response headers set here once received.
         TaskCompletionSource<Metadata> responseHeadersTcs = new TaskCompletionSource<Metadata>();