After it catches this error, the function returns (line 376):
return (fail (show e))
The "fail" is running in the Either monad (The Result type = Either).
This calls the default Monad implementation of fail, which is just a
call to plain old error. This basically causes the entire program to
crash.
Actually, it appears that simpleHTTP isn't actually supposed to throw
an IOException, and it is instead supposed to return a ConnError
result. So the real fix is to fix the code to make this happen. But
Sounds like a victim of
http://hackage.haskell.org/trac/ghc/ticket/4159
For mtl clients, 'fail' for 'Either' used to call 'Left'. That was
changed, though the ticket does not indicate the library
versions affected.
Claus
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