Haskell package Not on Stackage, then how?

Question

I want to use HList: Heterogeneous lists, but the package seems not on Stackage.

I currently use stack. In this case what is the option besides going back to use Cabal?

Possibly duplicate, or at least related: https://stackoverflow.com/questions/32016256/stack-init-package-not-found/32016828#32016828 — Koterpillar, Mar 01 '22 at 03:01

Koterpillar · Accepted Answer · 2022-03-01T03:29:31.437

4

Use extra-deps in stack.yaml:

extra-deps:
- HList-0.5.2.0

Stack should prompt you to if you add the package as a dependency in the Cabal file.

edited Mar 01 '22 at 03:29

answered Mar 01 '22 at 03:00

Koterpillar

Thanks! it works. By the way, the package name and URL was wrong, and modified to `HList: Heterogeneous lists`. – Functor Mar 01 '22 at 03:13
Please see the right syntax though, you have to pick an exact version. – Koterpillar Mar 01 '22 at 03:29
Thanks, it actually did not work from the start. I misunderstood. and now I get this `haskell-test/package.yaml: Ignoring unrecognized field $.extra-deps` for unknown reason, on `stack build`. any idea? – Functor Mar 01 '22 at 03:57
Put this in `stack.yaml`, not `package.yaml`. – Koterpillar Mar 01 '22 at 03:58
Eah, right, you wrote that too. Thanks again. – Functor Mar 01 '22 at 04:03

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