https://github.com/mwotton/try-dequeue

https://github.com/mwotton/try-dequeue

Last synced: about 1 month ago
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• Host: GitHub
• URL: https://github.com/mwotton/try-dequeue
• Owner: mwotton
• License: bsd-3-clause
• Created: 2018-05-23T13:47:03.000Z (over 6 years ago)
• Default Branch: master
• Last Pushed: 2018-05-23T13:47:14.000Z (over 6 years ago)
• Last Synced: 2024-10-27T18:28:00.417Z (3 months ago)
• Language: Haskell
• Size: 5.86 KB
• Stars: 1
• Watchers: 4
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# try-dequeue

I have been trying to use [Dequeue](http://hackage.haskell.org/package/dequeue-0.1.12/docs/Data-Dequeue.html) but I have not figured out how to define `q0`.

Do you have any ideas?

```shell

/Users/williamrusnack/Documents/haskell_practice/try-dequeue/src/Main.hs:9:11: error:

    • Ambiguous type variable ‘q0’ arising from a use of ‘empty’

      prevents the constraint ‘(Dequeue q0)’ from being solved.

      Relevant bindings include a :: q0 a (bound at src/Main.hs:9:7)

      Probable fix: use a type annotation to specify what ‘q0’ should be.

      These potential instance exist:

        instance [safe] Dequeue BankersDequeue -- Defined in ‘Data.Dequeue’

    • In the expression: empty

      In an equation for ‘a’: a = empty

      In the expression:

        do let a = empty

           let a' = pushFront a 'a'

           let b = first a'

           print b

  |

9 |   let a = D.empty

  |           ^^^^^^^

```