Logs: freenode/#haskell
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| 2020-09-23 22:55:02 | <monochrom> | Perhaps edwardk is on irccloud.com too. |
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| 2020-09-23 22:55:03 | <EvanR> | there's a conspiracy from irccloud to take down edk's client |
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| 2020-09-23 22:55:09 | <EvanR> | or that |
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| 2020-09-23 22:55:23 | <monochrom> | I support conspiracy theories. |
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| 2020-09-23 22:55:29 | <EvanR> | but he's the only one with a mask? crazy |
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| 2020-09-23 22:56:00 | <glguy> | gateway cloaks (like irccloud users have) override unaffiliated cloaks |
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| 2020-09-23 22:56:43 | <dolio> | If you want to understand part of why sigma and exists don't line up, you can actually read some of the work on parametricity in dependent type theories. Like Cavallo and Harper on parametricity in cubical type theory. There they point out that 'bridges' (relations, on which parametricity is based) and 'paths' (on which 'equality' is based) disagree for the universe. And the path type for a Σ type corresponds to paths for its components. So a path f |
| 2020-09-23 22:56:44 | <dolio> | or a (Σ U) type is going to be talking about *paths* between types, rather than relations between types. However, the point of a parametric existential type is for values to be equal based on a relational criterion. |
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| 2020-09-23 22:59:36 | <jamestmartin> | is it possible to export a function which uses an instance of a typeclass without exporting the instance itself? |
| 2020-09-23 23:00:30 | <jamestmartin> | while also exporting the typeclass, just not the instance |
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| 2020-09-23 23:01:51 | <EvanR> | well that helps, parametricity is based on relations |
| 2020-09-23 23:02:11 | <EvanR> | is there a readable paper on that |
| 2020-09-23 23:02:24 | × | alexm_ quits (~AlexM87@161.8.233.138) (Read error: Connection reset by peer) |
| 2020-09-23 23:02:36 | <glguy> | jamestmartin: No, you can't avoid exporting an instance |
| 2020-09-23 23:02:48 | <jamestmartin> | alright then |
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| 2020-09-23 23:02:59 | <dolio> | Wadler's Theorems for Free, maybe. I forget. |
| 2020-09-23 23:03:16 | <jamestmartin> | well, with linear types coming soon, that won't be necessary anyhow |
| 2020-09-23 23:03:21 | <jamestmartin> | I was just curious |
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| 2020-09-23 23:06:05 | <jamestmartin> | man, I'm hyped for linear types though. that's gonna be useful in so many ways. |
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| 2020-09-23 23:08:27 | <EvanR> | linear types coming soon? |
| 2020-09-23 23:09:20 | <jamestmartin> | linear types are going to be in ghc 8.12 from what I've heard |
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| 2020-09-23 23:10:07 | <EvanR> | damn that's sexy |
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| 2020-09-23 23:13:13 | <MarcelineVQ> | linear types should be pretty useful, they're the perfect way to shift people from complaining about IO being infections to complain about linearity being infectious |
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| 2020-09-23 23:14:56 | <int-e> | . o O ( Can we make it so that only one person can complain at a time? ) |
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