From d979ff72e757ecb652080a7e5c9bd4dc7cec8475 Mon Sep 17 00:00:00 2001
From: Stephen Toub <stoub@microsoft.com>
Date: Tue, 28 May 2019 20:36:52 -0400
Subject: [PATCH] Change StreamReader.ReadBufferAsync to return ValueTask<int>
 (dotnet/coreclr#24810)

It's a private helper that's always directly awaited.  No need to allocate a task each time it's called and data is synchronously available.

Commit migrated from https://github.com/dotnet/coreclr/commit/13405da4ba21095f7673a10eaabfef990117478d
---
 src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs b/src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs
index 0ebcede..cbfc729 100644
--- a/src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs
+++ b/src/libraries/System.Private.CoreLib/src/System/IO/StreamReader.cs
@@ -1238,7 +1238,7 @@ namespace System.IO
             return new ValueTask<int>(t);
         }
 
-        private async Task<int> ReadBufferAsync()
+        private async ValueTask<int> ReadBufferAsync()
         {
             _charLen = 0;
             _charPos = 0;
-- 
2.7.4