Library submissions

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As the Haskell community has grown, and emphasis on development has moved from language to libraries, the need for a formal process for making changes to core libraries has emerged.

The concern behind this process is:

  • to ensure on-going improvement to critical, shared code;
  • with appropriate levels of oversight and assurance.

This page documents the mechanism by which new code for libraries maintained by the community may be proposed. This mechanism has been in place since October 2006.

Creating a proposal

In order to ensure we have something concrete to discuss, please follow the following guidelines:

  • Currency. Make your changes against a copy of the HEAD branch of the relevant library, and make sure it compiles.
  • Portability. Code should be portable. If it is not portable, reasons should be given. At the very least ensure the code runs in Hugs and GHC, and on Windows and Linux.
  • Style. Follow the conventions in the library you are modifying.
  • Documentation. It must include valid Haddock documentation.
  • Tests. Code should ideally also come with suitable tests for the testsuite. There's currently some disagreement about what this means. Discussion of where we may want to head is in the library tests page.

Submitting the proposal

  • Patch. Create a darcs patch of your change using darcs record, including a rationale for the change. Save the patch to a file, using darcs send --output.
  • Tracking. Add a Trac ticket of type proposal for the appropriate library component, with a timescale for consideration (to focus the community's attention for a limited period), adding the patch file as an attachment.
  • Submission. Send an email containing the Trac ticket number and description to, which you need to subscribe before posting. (In the future this should happen when you record the ticket, but we haven't set it up yet.) You may wish to include a pointer to updated Haddock documentation, if relevant.

If someone has done all this, they are entitled to expect feedback; silence during the discussion period can be interpreted as consent.

Here are the proposals currently under consideration.

At the end of the discussion period

  • Add to the ticket a summary of the relevant parts of the discussion. (The summary is needed for anyone wondering about the change later: it's not reasonable to point people at a 50-message thread (but please do include a link to the thread in the list archives too, so that people can review it if they wish)).
  • If consensus was achieved, revise the patch as necessary, including the Trac ticket number, and commit it (or set the ticket state to "patch" so that someone will commit it for you).
  • Close the ticket (usually as fixed or wontfix).

A deeply held disagreement at this point may require some form of governance (voting, dictatorship, etc). This should be a rare event.

Here are the archived past proposals.

Here is an example of how to summarise a successful submission.

See also