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prevent thunks from building when calculating size in 'toBufWith' #967

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prevent thunks from building when calculating size in 'toBufWith' #967

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3 changes: 2 additions & 1 deletion warp/Network/Wai/Handler/Warp/IO.hs
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Original file line number Diff line number Diff line change
@@ -1,3 +1,4 @@
{-# LANGUAGE BangPatterns #-}
module Network.Wai.Handler.Warp.IO where

import Control.Exception (mask_)
Expand All @@ -19,7 +20,7 @@ toBufIOWith maxRspBufSize writeBufferRef io builder = do
size = bufSize writeBuffer
(len, signal) <- writer buf size
bufferIO buf len io
let totalBytesSent = toInteger len + bytesSent
let !totalBytesSent = toInteger len + bytesSent
case signal of
Done -> return totalBytesSent
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