How do I use CallStack?

Reid Barton rwbarton at
Mon Dec 7 05:51:03 UTC 2015

On Sun, Dec 6, 2015 at 11:56 PM, Richard Eisenberg <eir at>

> 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.

Reid Barton
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