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In Scala 3, why is it sometimes possible to do impredicative type assignment?

score 148 · Answer 1 · 2023-05-15T23:14:57.380000

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In Scala 3, why is it sometimes possible to do impredicative type assignment?

148 views Asked by tribbloid At 15 May 2023 at 23:14

score 224 · Answer 2 · 2021-11-26T21:42:32.953000

How to avoid impredicative polymorphism and define lens of lens

224 views Asked by Daniil Iaitskov At 26 November 2021 at 21:42

score 149 · Answer 3 · 2021-05-19T01:19:51.843000

"case" operator for System-F natural numbers coded with RankNTypes fails to typecheck

149 views Asked by Jonathan Gallagher At 19 May 2021 at 01:19

score 682 · Answer 4 · 2019-10-03T00:57:29.510000

What is the relationship between polymorphism's rank and (im)predicativity?

682 views Asked by Tim At 03 October 2019 at 00:57

score 1903 · Answer 5 · 2019-06-04T17:35:59.320000

Why is impredicative polymorphism allowed only for functions in Haskell?

1.9k views Asked by radrow At 04 June 2019 at 17:35

score 204 · Answer 6 · 2019-01-24T21:26:10.257000

Hold a lens in a record

204 views Asked by F. Böller At 24 January 2019 at 21:26

score 279 · Answer 7 · 2018-11-29T04:20:58.873000

Ways around impredictive polymorphism

279 views Asked by Neil Locketz At 29 November 2018 at 04:20

score 136 · Answer 8 · 2017-06-18T13:21:49.157000

Disallow assignment of values

136 views Asked by Philip Kamenarsky At 18 June 2017 at 13:21

score 212 · Answer 9 · 2017-01-07T15:07:36.440000

How to non-impredicatively return `Maybe` a lens?

212 views Asked by leftaroundabout At 07 January 2017 at 15:07

score 716 · Answer 10 · 2016-08-30T06:40:20.937000

Why are higher rank types so fragile in Haskell

716 views Asked by semicolon At 30 August 2016 at 06:40

score 199 · Answer 11 · 2016-07-21T19:56:10.037000

How to make impredicative types work with type classes

199 views Asked by semicolon At 21 July 2016 at 19:56

score 219 · Answer 12 · 2015-09-05T20:47:09.413000

Why does this equivalent program not compile?

219 views Asked by MaiaVictor At 05 September 2015 at 20:47

score 203 · Answer 13 · 2015-03-26T18:03:31.403000

How does let interact with higher rank types in Haskell?

203 views Asked by Doug McClean At 26 March 2015 at 18:03

score 287 · Answer 14 · 2014-11-22T09:33:47.013000

General 'typeless' STack in Haskell

287 views Asked by shivanker.goel At 22 November 2014 at 09:33

score 373 · Answer 15 · 2013-11-14T15:56:10.670000

Practical Implications of runST vs unsafePerformIO

373 views Asked by crockeea At 14 November 2013 at 15:56

score 418 · Answer 16 · 2013-09-29T20:58:11.470000

Existential quantifier in coq impredicative logic (System F)

418 views Asked by Matteo Zanchi At 29 September 2013 at 20:58

score 1084 · Answer 17 · 2013-03-28T19:01:19.410000

Impredicative polymorphism in F#

1k views Asked by David Monniaux At 28 March 2013 at 19:01

score 1397 · Answer 18 · 2012-12-26T22:50:42.533000

Simple example for ImpredicativeTypes

1.3k views Asked by Ben Millwood At 26 December 2012 at 22:50

score 2245 · Answer 19 · 2012-03-16T06:13:08.527000

Impredicative types vs. plain old subtyping

2.2k views Asked by mergeconflict At 16 March 2012 at 06:13

score 1256 · Answer 20 · 2012-02-18T07:50:40.800000

Row polymorphism in Haskell: trouble writing Forth DSL with "transformations"

1.2k views Asked by Dan Burton At 18 February 2012 at 07:50

TechQA.

List Question

In Scala 3, why is it sometimes possible to do impredicative type assignment?

How to avoid impredicative polymorphism and define lens of lens

"case" operator for System-F natural numbers coded with RankNTypes fails to typecheck

What is the relationship between polymorphism's rank and (im)predicativity?

Why is impredicative polymorphism allowed only for functions in Haskell?

Hold a lens in a record

Ways around impredictive polymorphism

Disallow assignment of values

How to non-impredicatively return `Maybe` a lens?

Why are higher rank types so fragile in Haskell

How to make impredicative types work with type classes

Why does this equivalent program not compile?

How does let interact with higher rank types in Haskell?

General 'typeless' STack in Haskell

Practical Implications of runST vs unsafePerformIO

Existential quantifier in coq impredicative logic (System F)

Impredicative polymorphism in F#

Simple example for ImpredicativeTypes

Impredicative types vs. plain old subtyping

Row polymorphism in Haskell: trouble writing Forth DSL with "transformations"

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