Can't build cassava (for csv file I/O) (my first attempt to use stack to build something useful)

[Jack Vice]

I am trying to import .csv data and so I am trying to build a simple example using cassava and I have run out of ideas to get it to work.  I added cassava-0.5.1.0 to stack.yaml and then the builder failed based on version and suggested bytestring-0.10.2.0, which I added then version failed and suggested deepseq-1.3.0.2 and then version failed and suggested base-4.7.0.2 and fails and keeps suggesting adding base-4.7.0.2 though it is in there.  I tried "allow-newer: true" and gave a bunch of type failures.  I also tried stack solver --update-config which just removed all the extra-deps: including cassava.  It appears not to find base-4.7.0.2. This is my first attempt to build something useful with stack.

"stack build" output below:

Error: While constructing the build plan, the following exceptions were encountered:

In the dependencies for deepseq-1.3.0.2:

    base-4.11.1.0 from stack configuration does not match >=4.3 && <4.8  (latest matching version is 4.7.0.2)

needed due to bayesHask-0.1.0.0 -> deepseq-1.3.0.2

Some different approaches to resolving this:

  * Set 'allow-newer: true' to ignore all version constraints and build anyway.

  * Consider trying 'stack solver', which uses the cabal-install solver to attempt to find some working build configuration. This can be convenient when dealing with many complicated constraint

    errors, but results may be unpredictable.

  * Recommended action: try adding the following to your extra-deps in /home/jack/Dropbox/src/bayesHask/stack.yaml:

- base-4.7.0.2

Plan construction failed.

stack.yaml file:

flags: {}

packages:

- .

extra-deps:

- cassava-0.5.1.0

- bytestring-0.10.2.0

- deepseq-1.3.0.2

- base-4.7.0.2

resolver: lts-12.5

#allow-newer: true

Lib.hs file:

module Lib

    ( someFunc

    ) where

import qualified Data.Text.IO as T

import qualified Data.ByteString.Lazy as BL

import Data.Csv

import qualified Data.Vector as V

someFunc :: IO ()

someFunc = putStrLn "someFunc"

package.yaml file:

name:                bayesHask

version:             0.1.0.0

github:              "githubuser/bayesHask"

license:             BSD3

author:              "Jack Vice"

maintainer:          "exa...@example.com"

copyright:           "2018 Jack Vice"

extra-source-files:

- README.md

- ChangeLog.md

# Metadata used when publishing your package

# synopsis:            Short description of your package

# category:            Web

# To avoid duplicated efforts in documentation and dealing with the

# complications of embedding Haddock markup inside cabal files, it is

# common to point users to the README.md file.

description:         Please see the README on GitHub at <https://github.com/githubuser/bayesHask#readme>

dependencies:

- base >= 4.7 && < 5

- text

- bytestring

- cassava

library:

  source-dirs: src

executables:

  bayesHask-exe:

    main:                Main.hs

    source-dirs:         app

    ghc-options:

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - bayesHask

tests:

  bayesHask-test:

    main:                Spec.hs

    source-dirs:         test

    ghc-options:

    - -threaded

    - -rtsopts

    - -with-rtsopts=-N

    dependencies:

    - bayesHask

[Michael Snoyman]

What version of Stack are you using? What message do you get if you remove the entire extra-deps section?

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[Jack Vice]

Thank you.  I actually switched to MissingH to do the csv file I/O stuff and I just got it to build-compile using stack. I am on Ubuntu 18.04 and stack 1.7.1.