I don't know if this is a known issue which I've stumbled across using the
Debug.Trace library:
If you run this sample code¹ you'll see that six lines of output are
generated.
Now uncomment the WX import and try again, you should see only four lines of
output.
It appears anything written to stderr is being eaten up in any module which
imports WX, which is fairly inconvenient.
Can anyone think why this could be?
Notably the Debug.Trace module states:
"Usually the output stream is System.IO.stderr but if the function is called
from Windows GUI application then the output will be directed to the Windows
debug console".
So I'd be interested to have a Windows user try this out.
¹ wx_stderr_test.hs:
module Main where
-- import Graphics.UI.WX
import Debug.Trace
import System.IO.Unsafe
main :: IO ()
main = do
print (trace "DEBUG_TRACE" "APPLE")
print (unsafePerformIO (putTraceMsg "UNSAFE_TRACE_MSG" >> return
"BANANA"))
print (unsafePerformIO (putStrLn "UNSAFE_PUT_STR" >> return "CUCUMBER"))
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