Krasimir Angelov wrote:
This usually happens when there is an uncaught Haskell exception. In
this case the RTS shows it in a message box. The problem is that with
threaded RTS the running thread might be different from the main
thread and in this case you can't see the message. Instead you have to
use the Spy++ tool distributed with Visual Studio. Look for a message
box with title "vs_haskell.dll" and see the message inside it.
So it isn't possible to call MessageBox() from an arbitrary thread? Should we
be doing something in the RTS to work around this?
Cheers,
Simon
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