Proposal: Continue the displayException program

Michael Snoyman michael at
Thu May 10 03:44:55 UTC 2018

As I'm guessing you'd expect, I'm +1 on this.

On Thu, May 10, 2018, 4:12 AM David Feuer <david.feuer at> wrote:

> Several years ago, Michael Snoyman proposed [*] that we add a
> displayException method to the Exception class, and that we make GHC use it
> in the default handler. The first part of that proposal was accepted and
> implemented, but the second part was not, for reasons that are not very
> clear to me. I would like to re-propose that we change the default
> exception handler to use displayException instead of Show. This seems like
> a much better default, and anyone who wants to do it the old way can still
> change the top-level handler.
> [*]
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