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  • Glasgow Haskell Compiler
  • GHCGHC
  • Issues

  • Open 48
  • Closed 125
  • All 173
New issue
  • Priority Created date Last updated Milestone due date Due date Popularity Label priority Manual Weight Blocking
  • [Discussion] Integrating DataTypeable, Functor, Foldable, Traversable, Generic and Lift in the `stock` deriving strategy
    #19707 · opened Apr 15, 2021 by Hécate Moonlight   Plow Tfeature request deriving
    • 1
    • 7
    updated Apr 16, 2021
  • Don't suggest turning on `DeriveAnyClass` when an instance cannot be derived
    #19692 · opened 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 · opened Feb 26, 2021 by Sebastian Graf   Tbug compiler perf deriving pointer tagging
    • 0
    updated Apr 02, 2021
  • Support overriding "No instance" errors using the default deriving strategy
    #19418 · opened Feb 22, 2021 by infinity0   Tfeature request deriving
    • 0
    updated Mar 02, 2021
  • DerivingVia: incorrectly accepts deriving via types with differing runtime representations
    #19079 · opened Dec 16, 2020 by Zachary Churchill   DerivingVia Pnormal Tbug deriving documentation newcomer
    • 4
    updated Dec 20, 2020
  • Deriving multiple classes in standalone (or document this limitation)
    #18874 · opened 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 · opened May 22, 2020 by Andrew Pritchard   DerivingVia Tfeature request deriving
    • 0
    updated May 24, 2020
  • GND generates code that instantiates coerce too much
    #18213 · opened 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 · opened 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 · opened 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 · opened Nov 26, 2019 by Icelandjack   Tbug deriving documentation
    • 3
    updated Nov 28, 2019
  • GeneralizedNewtypeDeriving should not require that constructor be in scope
    #17328 · opened Oct 09, 2019 by Richard Eisenberg   deriving typechecker
    • 9
    updated Jul 03, 2020
  • Replace useages of con2tag_* in the deriving code with data2tag#
    #17241 · opened 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 · opened Sep 12, 2019 by Richard Eisenberg   DerivingVia Tbug deriving documentation
    • 0
    updated Sep 12, 2019
  • Stock deriving improvements
    #17037 · opened Aug 07, 2019 by Sophie Taylor   Pnormal Tfeature request deriving rules runtime perf
    • 0
    updated Jan 23, 2020
  • GHC accepts DerivingVia-generated instances that violate functional dependencies
    #17013 · opened Jul 31, 2019 by Alexis King   FunctionalDependencies Pnormal deriving
    • 4
    updated Aug 01, 2019
  • Generic1 deriving should use more coercions
    #15969 · opened Nov 29, 2018 by David Feuer   5   Pnormal Tbug Trac import deriving generics runtime perf
    • 4
    updated Jan 23, 2020
  • Standard deriving should be less conservative when `UndecidableInstances` is enabled
    #15868 · opened Nov 07, 2018 by edsko@edsko.net   5   Pnormal Tfeature request Trac import deriving
    • 6
    updated Jul 22, 2019
  • Add (or document if already exist) ability to derive custom typeclasses via source plugins
    #15650 · opened Sep 17, 2018 by Dmitrii Kovanikov   8.6.1   5   Pnormal Tfeature request Trac import deriving plugins
    • 1
    • 10
    updated Jul 19, 2019
  • DerivingVia (and perhaps even GND) works badly with DeriveGeneric
    #15434 · opened Jul 24, 2018 by Hiromi Ishii   9.2.1   5   Pnormal Tbug Trac import deriving
    • 6
    updated Jan 23, 2021
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