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Haskell typeclass constraint cannot be resolved due to Paterson's conditions

score 294 · Answer 1 · 2025-01-06 15:39:59

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Haskell typeclass constraint cannot be resolved due to Paterson's conditions

294 views Asked by madgen At 06 January 2025 at 15:39

score 152 · Answer 2 · 2025-01-07 08:48:51

GHC stuck due to UndecidableSuperClasses - expected behaviour or bug?

152 views Asked by yairchu At 07 January 2025 at 08:48

score 137 · Answer 3 · 2025-01-06 15:37:48

Is it able to avoid UndecidableInstances in this example?

137 views Asked by qimokao At 06 January 2025 at 15:37

score 83 · Answer 4 · 2025-01-06 15:35:45

Writing generic Monoid over Cofree; undecidable?

83 views Asked by Chris Penner At 06 January 2025 at 15:35

score 1032 · Answer 5 · 2025-01-06 15:37:47

How can undecidable instances actually hang the compiler?

1k views Asked by leftaroundabout At 06 January 2025 at 15:37

score 68 · Answer 6 · 2025-01-06 15:37:45

Example of the undecidability of higher-order unification

68 views Asked by nikkkk At 06 January 2025 at 15:37

score 212 · Answer 7 · 2025-01-06 15:35:16

Transitive 'Subset` class for type-level-sets

212 views Asked by ShapeOfMatter At 06 January 2025 at 15:35

score 161 · Answer 8 · 2025-01-06 15:41:08

Can I automatically produce typeclass instances for a conversion function without being overly permissive?

161 views Asked by Alexis King At 06 January 2025 at 15:41

score 339 · Answer 9 · 2025-01-06 15:40:56

Why does this code using UndecidableInstances compile, then generate a runtime infinite loop?

339 views Asked by Alexis King At 06 January 2025 at 15:40

score 1663 · Answer 10 · 2025-01-06 15:34:44

Turing Machine for regular languages

1.6k views Asked by Mba7eth At 06 January 2025 at 15:34

TechQA.

List Question

Haskell typeclass constraint cannot be resolved due to Paterson's conditions

GHC stuck due to UndecidableSuperClasses - expected behaviour or bug?

Is it able to avoid UndecidableInstances in this example?

Writing generic Monoid over Cofree; undecidable?

How can undecidable instances actually hang the compiler?

Example of the undecidability of higher-order unification

Transitive 'Subset` class for type-level-sets

Can I automatically produce typeclass instances for a conversion function without being overly permissive?

Why does this code using UndecidableInstances compile, then generate a runtime infinite loop?

Turing Machine for regular languages

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