[Haskell-cafe] semantics of concurrent program depends on -O level, -f[no-]omit-yields

[Johannes Waldmann]

> ... try flushing stdout within the forked thread,

I did. The behaviour is still as described:
depends on -O0/2, [no]omit-yield,
and small changes in the source.

While I agree with the general point -
why would I need to hFlush after putStrLn?
hGetBuffering stdout  tells me it's  LineBuffering,
and putStrLn does write a line?

- J.