On Sun, Dec 6, 2015 at 11:56 PM, Richard Eisenberg <e...@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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