I'm quite strongly against the proposal in its current form, as I've posted on the thread: https://github.com/ghc-proposals/ghc-proposals/pull/351#issuecomment-849654517 But I'd like to see it get into shape into something that could be accepted, as I agree with the motivation here (and would similarly use this in practice).

On May 26, 2021, at 8:32 AM, Vitaly Bragilevsky <bravit111@gmail.com> wrote:

Dear Committee,

We have been discussing the NoIncomplete pragma proposal by John Ericson for quite a long time. I think it's ready for acceptance.

The proposal itself: https://github.com/ghc-proposals/ghc-proposals/pull/351
The rendered version: https://github.com/Ericson2314/ghc-proposals/blob/no-sugared-incompleteness/proposals/0000-no-incomplete.rst

The proposal aims to introduce the NoIncomplete pragma that would prohibit programs which have a source of incompleteness (in patterns, in methods) in them. There is also the new -fdefer-incompleteness-errors flag.

I think this feature comes quite handy in education. I'd use it all the time with my students.

Please comment here or in the GitHub thread if you see any problems with this proposal.

Vitaly

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