Problem loading module Data.Number.CReal in cabal file - haskell

Question

I installed a simple proyect with stack, my stack.yaml looks like:
resolver: lts-14.6
packages:
- .
dependencies:
- base (>=3 && <5)
- numbers
and I have a simple code that only calls a function:
module Main where
import Lib
import Data.Number.CReal
main :: IO ()
main = someFunc
and the error is always the same:
numbers-play-0.1.0.0: unregistering (local file changes: numbers-play.cabal)
numbers-play> configure (lib + exe)
Configuring numbers-play-0.1.0.0...
numbers-play> build (lib + exe)
Preprocessing library for numbers-play-0.1.0.0..
Building library for numbers-play-0.1.0.0..
[1 of 2] Compiling Lib
[2 of 2] Compiling Paths_numbers_play
Preprocessing executable 'numbers-play-exe' for numbers-play-0.1.0.0..
Building executable 'numbers-play-exe' for numbers-play-0.1.0.0..
[1 of 2] Compiling Main [Data.Number.CReal changed]
/home/damian/dev/haskell/numbers-play/app/Main.hs:4:1: error:
Could not load module ‘Data.Number.CReal’
It is a member of the hidden package ‘numbers-3000.2.0.2’.
Perhaps you need to add ‘numbers’ to the build-depends in your .cabal file.
Use -v to see a list of the files searched for.
|
4 | import Data.Number.CReal
| ^^^^^^^^^^^^^^^^^^^^^^^^
My cabal file:
cabal-version: 1.12
-- This file has been generated from package.yaml by hpack version 0.31.2.
--
-- see: https://github.com/sol/hpack
--
-- hash: fb0ed9e8eb8062639f1d6a02a65d857d15b3265158925242287d4a8a885f8381
name: numbers-play
version: 0.1.0.0
description: Please see the README on GitHub at <https://github.com/githubuser/numbers-play#readme>
homepage: https://github.com/githubuser/numbers-play#readme
bug-reports: https://github.com/githubuser/numbers-play/issues
author: Author name here
maintainer: example#example.com
copyright: 2019 Author name here
license: BSD3
license-file: LICENSE
build-type: Simple
extra-source-files:
README.md
ChangeLog.md
source-repository head
type: git
location: https://github.com/githubuser/numbers-play
library
exposed-modules:
Lib
other-modules:
Paths_numbers_play
hs-source-dirs:
src
build-depends:
base >=4.7 && <5
default-language: Haskell2010
executable numbers-play-exe
main-is: Main.hs
other-modules:
Paths_numbers_play
hs-source-dirs:
app
ghc-options: -threaded -rtsopts -with-rtsopts=-N
build-depends:
base >=4.7 && <5
, numbers-play
default-language: Haskell2010
test-suite numbers-play-test
type: exitcode-stdio-1.0
main-is: Spec.hs
other-modules:
Paths_numbers_play
hs-source-dirs:
test
ghc-options: -threaded -rtsopts -with-rtsopts=-N
build-depends:
base >=4.7 && <5
, numbers-play
default-language: Haskell2010
How can I import it properly?

Answer 1

The dependencies field, which specifies the numbers dependency, should be in your package.yaml file (which Stack uses to generate the cabal file), and not in stack.yaml (which is for Stack-specific configuration, such as choosing the resolver).