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{-# LANGUAGE BangPatterns, MagicHash, UnboxedTuples #-}
{-# OPTIONS_GHC -Wall #-}
module Main ( main ) where
import GHC.Base
data BA = BA ByteArray#
-- Checks that setByteArray# works
main :: IO ()
main = do BA ba <- IO $ \s0 ->
case newByteArray# 8# s0 of
(# !s1, !mba #) ->
case setByteArray# mba 0# 8# 65# s1 of -- ASCII 'A'
!s2 ->
case setByteArray# mba 1# 6# 67# s2 of -- ASCII 'B'
!s3 ->
-- N.B. 0-length should be a no-op
case setByteArray# mba 2# 0# 68# s3 of -- ASCII 'C'
!s4 ->
case unsafeFreezeByteArray# mba s4 of
(# s5, ba #) -> (# s5, BA ba #)
let f (I# i) = putStrLn [C# (indexCharArray# ba i)]
mapM_ f [0..7]
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