> [Indented text is me; unindented text is GHCi]
>
> Initial experience with the bug:
>
> *Autoexi> let x e = do putStrLn "hmm..."; return 'c'
> *Autoexi> y <- catch (getChar) (x)
>
> here, I hit ^C several times, hoping to catch that as an exception.
> This didn't seem to happen, and GHCi appeared to still be waiting
> for a key, so I pressed 'h'
>
> hInterrupted.
> *Autoexi> y
> ghc-5.04.1: panic! (the `impossible' happened, GHC version 5.04.1):
> rdrNameModule y
>
> Please report it as a compiler bug to
> [EMAIL PROTECTED],
> or http://sourceforge.net/projects/ghc/.
>
> With a fresh GHCi:
>
> Prelude> let x e = return 'c'
> Prelude> y <- catch (getChar) (x)
>
> GHCi responded immediately to my first ^C, here.
>
> Interrupted.
> Prelude> y
> ghc-5.04.1: panic! (the `impossible' happened, GHC version 5.04.1):
> rdrNameModule y
There are two issues here:
- the 'rdrNameModule' crash has been reported before, and the
fix will be in 5.04.2
- the reason that ^C is not responded to immediately appears to
be due to a bad interaction with readline. The readline library
puts the input descriptor into blocking mode if it finds it
in non-blocking mode, whereas GHC's IO library expects it to be
in non-blocking mode all the time. We might be able to work
around this by placing stdin back into non-blocking mode after
each call to readline... I'll look into it.
Cheers,
Simon
> Please report it as a compiler bug to
> [EMAIL PROTECTED],
> or http://sourceforge.net/projects/ghc/.
>
>
> Prelude> y <- catch (getChar) (x)
>
> This time I hit ^C several times, but only got a response when I
> pressed a key.
>
> iInterrupted.
> Prelude> y
> ghc-5.04.1: panic! (the `impossible' happened, GHC version 5.04.1):
> rdrNameModule y
>
> Please report it as a compiler bug to
> [EMAIL PROTECTED],
> or http://sourceforge.net/projects/ghc/.
>
>
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