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

Sean Leather leather at cs.uu.nl
Fri Nov 20 13:02:36 EST 2009

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

> 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!


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