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  • Glasgow Haskell Compiler
  • GHCGHC
  • Issues

  • Open 52
  • Closed 142
  • All 194
New issue
  • Priority Created date Last updated Milestone due date Due date Popularity Label priority Manual Title Weight Blocking
  • `coerce`ing a function should be possible without type applications when we can newtype derive the method
    #20821 · created Dec 14, 2021 by Sebastian Graf   Coercible Tfeature request deriving
    • 3
    updated Dec 14, 2021
  • Make coerce-derived dictionaries coercible
    #20815 · created Dec 13, 2021 by Icelandjack   Coercions Plow Tfeature request deriving
    • 4
    updated Dec 14, 2021
  • feature request: deriving for Data.Bifoldable Data.Bifunctor Data.Bitraversable
    #20314 · created Aug 31, 2021 by Carter Schonwald   Research needed   Pnormal Tfeature request core libraries deriving
    • 2
    updated Sep 07, 2021
  • Inflexible DerivingVia
    #20099 · created Jul 11, 2021 by Jaro Reinders   DerivingVia Plow Tfeature request deriving proposal pending
    • 3
    updated Sep 28, 2021
  • Odd GND failure/success
    #19936 · created Jun 03, 2021 by David Feuer   DerivingVia Tquestion deriving info needed roles
    • 6
    updated Jun 08, 2021
  • Should Generically (/ Generically1) derive newtype Generic (/ Generic1)?
    #19906 · created May 27, 2021 by Icelandjack   DerivingVia Plow Tfeature request core libraries deriving info needed
    • 3
    updated May 30, 2021
  • DeriveFunctor: Use `contramap' in contravariant position
    #19713 · created Apr 16, 2021 by Icelandjack   Tfeature request deriving
    • 3
    updated Apr 19, 2021
  • [Discussion] Integrating DataTypeable, Functor, Foldable, Traversable, Generic and Lift in the `stock` deriving strategy
    #19707 · created Apr 15, 2021 by Hécate Moonlight   Plow Tfeature request deriving
    • 3
    • 7
    updated Apr 16, 2021
  • Don't suggest turning on `DeriveAnyClass` when an instance cannot be derived
    #19692 · created Apr 13, 2021 by syd@cs-syd.eu   Pnormal Tfeature request deriving
    • 2
    • 1
    updated Apr 15, 2021
  • (Derived) Ord instances generate terrible code
    #19445 · created Feb 26, 2021 by Sebastian Graf   9.6.1   Tbug compiler perf deriving pointer tagging
    • 5
    updated Apr 06, 2022
  • Support overriding "No instance" errors using the default deriving strategy
    #19418 · created Feb 22, 2021 by infinity0   Tfeature request deriving
    • 0
    updated Mar 02, 2021
  • Deriving multiple classes in standalone (or document this limitation)
    #18874 · created Oct 22, 2020 by Julien Debon   Tfeature request deriving
    • 1
    • 1
    updated Nov 08, 2020
  • Relax inferred context simplification to allow "exotic" contexts for GeneralizedNewtypeDeriving and DerivingVia instances.
    #18219 · created May 22, 2020 by Andrew Pritchard   DerivingVia Tfeature request deriving
    • 0
    updated May 24, 2020
  • GND generates code that instantiates coerce too much
    #18213 · created May 21, 2020 by Ryan Scott   QuantifiedConstraints deriving
    • 1
    • 5
    updated Oct 31, 2020
  • ConstrainedClassMethods can trigger un-actionable redundant constraint warnings together with GND
    #18148 · created May 06, 2020 by Koz Ross   Pnormal Tbug deriving error messages roles
    • 18
    updated May 22, 2020
  • DeriveGeneric gets a wrong infix constructor associativity when type is declared in a different module
    #18101 · created Apr 26, 2020 by Xia Li-yao   Pnormal Tbug deriving generics incorrect runtime result
    • 0
    updated May 10, 2020
  • Can't derive TYPE rep instances
    #17518 · created Nov 26, 2019 by Icelandjack   Tbug deriving documentation
    • 3
    updated Jun 16, 2021
  • GeneralizedNewtypeDeriving should not require that constructor be in scope
    #17328 · created Oct 09, 2019 by Richard Eisenberg   deriving typechecker
    • 9
    updated Jul 03, 2020
  • Replace useages of con2tag_* in the deriving code with data2tag#
    #17241 · created Sep 24, 2019 by Andreas Klebinger   8.10.2   Tfeature request deriving
    • 4
    updated Feb 09, 2021
  • -XDerivingVia (and deriving strategies) is under specified in the manual
    #17183 · created Sep 12, 2019 by Richard Eisenberg   DerivingVia Tbug deriving documentation
    • 1
    updated Jul 05, 2021
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