:set -fbreak-on-exception in GHCi causes exception in readFile

[Sean Leather]

On Fri, Nov 20, 2009 at 18:31, Jose Iborra wrote:

> This is by design, -fbreak-on-exception breaks on any exception, be it
> captured or not, even on library code.
>

Ah, that's what I missed. I would've guessed that it only breaks on uncaught
exceptions.


> I am not sure how readFile is implemented internally, but it probably reads
> from the file until an eoferror is thrown and then captures it gracefully.
>

That's what I expect, too. I went fishing, but didn't find the exact spot
where that happens within a few minutes.


> There is another debugger flag, -fbreak-on-error, which only breaks on
> unhandled exceptions.
> Is this what you want ?
>

Probably. Now I see the difference in [1]. Thanks!

[1]
http://www.haskell.org/ghc/docs/latest/html/users_guide/flag-reference.html#interactive-mode-options

Regards,
Sean
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