2026/04/22

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2026-04-22 18:41:25 +0000 <monochrom> Personally I just fight bottom mistakes with test cases. This is more powerful in Haskell than in many other languages. Due to parametricity, if a sufficiently polymorphic function terminates for one test, then it terminates for a large generality.
2026-04-22 18:38:44 +0000 <gentauro> must try again I guess
2026-04-22 18:38:38 +0000 <gentauro> I tried to use it, couldn't make it build (nightly though)
2026-04-22 18:36:32 +0000 <monochrom> But I have a feeling that Liquid Haskell is even less widely used than Lean.
2026-04-22 18:36:03 +0000 <monochrom> I guess yes.
2026-04-22 18:35:39 +0000 <gentauro> monochrom: can you ban `bottom` with Liquid Haskell comments?
2026-04-22 18:34:34 +0000gmg(~user@user/gehmehgeh) gehmehgeh
2026-04-22 18:30:03 +0000ski. o O ( "Higher-Order Recursion Abstraction: How to Make Ackermann, Knuth and Conway Look Like a Bunch of Primitives, Figuratively Speaking" by Baltasar Trancón y Widemann in 2018-09-17 at <https://arxiv.org/abs/1602.05010> )
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2026-04-22 18:20:46 +0000target_i(~target_i@user/target-i/x-6023099) target_i
2026-04-22 18:02:35 +0000 <monochrom> (When I took a compiler course and submitted its toy compiler project)
2026-04-22 18:01:22 +0000 <monochrom> When I took a compiler course, I submitted as a test case the Ackermann function! (The prof gave bonus marks for supporting recursion.)
2026-04-22 17:56:07 +0000ft(~ft@p508db287.dip0.t-ipconnect.de) ft
2026-04-22 17:54:23 +0000 <monochrom> Yeah my thesis supervisor is like "termination is uninformative" because of that.
2026-04-22 17:53:51 +0000 <int-e> monochrom: if it can implement the Ackermann function, is it really terminating ;)
2026-04-22 17:52:49 +0000 <monochrom> (unless the talker actually advocates going all out for those two)
2026-04-22 17:52:06 +0000 <monochrom> For now, IMO banning bottoms is just a lot of high-horse unpragmatic talk.
2026-04-22 17:51:32 +0000 <monochrom> To be sure, I would be happy if someone found a third way much more ergonomic than those two.
2026-04-22 17:50:50 +0000 <monochrom> (Belated) If one wants to ban bottoms, the only two currently widely deployed ways are System F (eg Dhall) and dependent type theory (eg Agda, Lean).
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2026-04-22 17:44:17 +0000rabbull(~rabbull@user/rabbull) rabbull