bad resolver recommends "nightly-2015-01-01", which confused me

[radix]

If I put resolver: nightly in my stack.yaml file (which I just tried), I got this message

AesonException "Invalid resolver value: nightly. Possible valid values include lts-2.12, nightly-2015-01-01, and ghc-7.10."

This made me think that nightly-2015-01-01 was the only nightly I could use for some reason. Of course I read "include" as "are", which was my mistake, but an easy one to make.

Showing the entire list of possible values would be nice, but perhaps infeasible? It would presumably require an HTTP request to Stackage, and may also be overwhelming given that there are presumably hundreds of nightlies.

[bitemyapp]

@radix that or demonstrate the date format, explaining nightly as a special case.

[drwebb]

It would be nice to just have 'nightly' as an option, can we use
http://www.stackage.org/download/snapshots.json

[snoyberg]

I'm definitely open to improvements to the wording to be less confusing. In fact, if you have a better approach, feel free to just edit it!

@drwebb Taking that approach would remove the possibility of having reproducible builds, as suddenly a new Stackage Nightly would change what your code is built against.

[snoyberg]

Thanks for the PR. Should we close this issue?

[radix]

Yeah, I'll close it. I mentioned what I think is a nice longer-term solution in #211 (comment).

Thank you for the review/merge!