How do I use CallStack?

[Reid Barton]

On Sun, Dec 6, 2015 at 11:56 PM, Richard Eisenberg <eir at cis.upenn.edu>
wrote:

> That looks like exactly what I want. Thanks.
>
> There remain two mysteries:
> - I thought that CallStacks were a new feature that would come with GHC
> 8.0. Yet it seems the datatype is present in base-4.8.x. Even though the
> docs even say (wrongly, evidently) that it's in base since 4.9.
>

Somehow some CallStack-related things snuck in between 7.10.1 and 7.10.2.
Compare https://hackage.haskell.org/package/base-4.8.0.0/docs/GHC-Stack.html
and https://hackage.haskell.org/package/base-4.8.1.0/docs/GHC-Stack.html.

Regards,
Reid Barton
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