2 May
2010
2 May
'10
6:31 a.m.
On Sun, May 02, 2010 at 12:10:23AM +0200, Sebastian Fischer wrote:
although, don't_launch_first is a non-terminating computation. Without black-hole detection this code would never 'launch missiles'.
Is the above output intended?
Yes.
go_ahead :: SomeException -> IO () go_ahead _ = putStr "go ahead, "
Note that catching all exceptions is rarely the right thing to do. See http://www.haskell.org/ghc/docs/6.12.2/html/libraries/base-4.2.0.1/Control-E... for more details.
The idea behind black-hole detection is that one bottom is as good as another [1]. Consequently, exception handling may not distinguish between non-termination and other errors.
Pure code can't distinguish, but exception handling code in IO can. Thanks Ian