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  • Glasgow Haskell Compiler
  • GHCGHC
  • Issues

  • Open 1,094
  • Closed 1,436
  • All 2,530
New issue
  • Priority Created date Last updated Milestone due date Due date Popularity Label priority Manual Weight
  • Thoughts on notation for tuples and vector types
    #18578 · opened Aug 15, 2020 by jdkr   feature request
    • 10
    updated Aug 25, 2020
  • Have System.Timeout.timeout fail if exceptions are uninterruptibly masked
    #18580 · opened Aug 15, 2020 by Facundo Domínguez   core libraries feature request
    • 1
    • 19
    updated Aug 18, 2020
  • Consider enabling `-ferror-spans` by default.
    #18581 · opened Aug 16, 2020 by Dmitry Ivanov   error messages feature request
    • 1
    updated Sep 30, 2020
  • Add mechanism to suppress pattern-match exhaustiveness checking at a finer granularity
    #18610 · opened Aug 26, 2020 by Ryan Scott   feature request pattern match warnings
    • 1
    • 7
    updated Feb 24, 2021
  • User's guide: Include Index in left pane
    #18629 · opened Aug 31, 2020 by Richard Eisenberg   documentation feature request
    • 0
    updated Sep 01, 2020
  • Warning for partial solutions to HasField constraints
    #18650 · opened Sep 04, 2020 by Adam Gundry   OverloadedRecordFields error messages feature request records
    • 9
    updated Sep 18, 2020
  • Allow access to "unoptimised" Core binds in GHC Plugins
    #18671 · opened Sep 09, 2020 by Alfredo Di Napoli   feature request plugins
    • 10
    updated Sep 23, 2020
  • Suggest PatternSynonyms when appropriate
    #18683 · opened Sep 12, 2020 by Adam Gundry   Plow PatternSynonyms error messages feature request
    • 1
    updated Sep 14, 2020
  • RTS ghc-debug: support non-threaded runtime
    #18690 · opened Sep 14, 2020 by David Eichmann   feature request
    • 2
    updated Sep 18, 2020
  • Integrate a minimal lens library with GHC
    #18693 · opened Sep 15, 2020 by Sebastian Graf   feature request
    • 1
    • 10
    updated Sep 28, 2020
  • Teach GHC about the evaluatedness of compacted things
    #18709 · opened Sep 17, 2020 by David Feuer   compact normal forms feature request runtime perf
    • 0
    updated Sep 17, 2020
  • More intelligent recompilation for Typed Template Haskell splices
    #18711 · opened Sep 18, 2020 by Ben Gamari   TemplateHaskell feature request recompilation checking
    • 2
    updated Sep 18, 2020
  • PmCheck: Inhabitation testing through set approximations
    #18735 · opened Sep 22, 2020 by Sebastian Graf   feature request pattern match warnings
    • 1
    updated Sep 30, 2020
  • Infer multiplicity of case expression
    #18738 · opened Sep 23, 2020 by Arnaud Spiwack   LinearTypes feature request typechecker
    • 1
    updated Feb 18, 2021
  • Infer multiplicity of let expression
    #18739 · opened Sep 23, 2020 by Arnaud Spiwack   LinearTypes feature request typechecker
    • 6
    updated Sep 28, 2020
  • Expose primop to atomically "clone" a thread stack
    #18741 · opened Sep 23, 2020 by Sven Tennie   feature request
    • 1
    • 18
    updated Feb 22, 2021
  • Compact Region allocator creates unexpectedly small blocks
    #18757 · opened Sep 28, 2020 by Fabian Thorand   compact normal forms feature request
    • 1
    • 2
    updated Oct 14, 2020
  • Configurable/overridable settings file
    #18763 · opened Sep 29, 2020 by Mathieu Boespflug   8.10.3   feature request
    • 1
    updated Sep 30, 2020
  • Improve "No instance for HasField" error messages
    #18776 · opened Sep 30, 2020 by Adam Gundry   OverloadedRecordFields error messages feature request records
    • 4
    • 0
    updated Dec 02, 2020
  • Programmatic Access to Profiling Data
    #18778 · opened Sep 30, 2020 by Timothy Bess   feature request profiling
    • 10
    updated Dec 08, 2020
  • primops for word64 xWithCarry operations
    #18792 · opened Oct 02, 2020 by Carter Schonwald   feature request numerics primops
    • 0
    updated Oct 05, 2020
  • WinIO improvement: Multiple workers
    #18805 · opened Oct 05, 2020 by Ben Gamari   Windows feature request winio
    • 0
    updated Oct 05, 2020
  • Include path to ghc-pkg in `ghc --info`
    #18807 · opened Oct 05, 2020 by Ben Gamari   feature request
    • 1
    • 1
    updated Oct 06, 2020
  • Allow pragmas on field selectors.
    #18811 · opened Oct 06, 2020 by Andreas Klebinger   Research needed   Plow feature request records
    • 3
    updated Oct 06, 2020
  • Hardian: make nofib rule more fine-grained   0 of 1 task completed
    #18827 · opened Oct 10, 2020 by Alex D   feature request hadrian nofib
    • 0
    updated Nov 09, 2020
  • Display accepted performance metrics
    #18839 · opened Oct 13, 2020 by Sylvain Henry   feature request testsuite
    • 1
    • 2
    updated Oct 28, 2020
  • Add progress bar and interruptibility to loading up interpreted code
    #18858 · opened Oct 17, 2020 by tysonzero   GHCi feature request
    • 1
    updated Nov 09, 2020
  • Add option to disable SCC on a module when built for profiling
    #18867 · opened Oct 20, 2020 by Douglas RAILLARD   feature request profiling
    • 1
    updated Nov 08, 2020
  • Include field type in missing field error message
    #18869 · opened Oct 20, 2020 by parsonsmatt   Pnormal error messages feature request records
    • 1
    • 10
    updated Jan 18, 2021
  • Deriving multiple classes in standalone (or document this limitation)
    #18874 · opened Oct 22, 2020 by Julien Debon   deriving feature request
    • 1
    • 1
    updated Nov 08, 2020
  • Scoped Typed Holes
    #18878 · opened Oct 22, 2020 by parsonsmatt   feature request typed holes
    • 2
    updated Nov 09, 2020
  • Cmm output should exploit Unf=OtherCon []
    #18879 · opened Oct 23, 2020 by AndrasKovacs   feature request pointer tagging runtime perf
    • 8
    updated Oct 28, 2020
  • Enable -fwarn-incomplete-patterns by default
    #18880 · opened Oct 23, 2020 by Hjulle   Pnormal error messages feature request
    • 2
    • 3
    updated Dec 09, 2020
  • -Winvalid-haddock should be part of -Wall
    #18905 · opened Oct 29, 2020 by Oleg Grenrus   error messages feature request
    • 3
    updated Nov 14, 2020
  • Allow extra variables in class declaration context (in restricted situations)
    #18906 · opened Oct 29, 2020 by sheaf   feature request
    • 2
    updated Nov 03, 2020
  • Testsuite using stage=1 compiler
    #18924 · opened Nov 03, 2020 by Simon Peyton Jones   feature request testsuite
    • 0
    updated Nov 03, 2020
  • New bit test and set primop?
    #18935 · opened Nov 09, 2020 by vdukhovni   feature request primops
    • 1
    • 3
    updated Nov 10, 2020
  • Fold away or reduce `and# (extendWordN# x) mask`
    #18943 · opened Nov 12, 2020 by Moritz Angermann   feature request runtime perf
    • 0
    updated Nov 18, 2020
  • List fusion: Make traverse et al. good producers
    #18949 · opened Nov 13, 2020 by Sebastian Graf   core libraries feature request fusion
    • 1
    updated Nov 18, 2020
  • Extensible Interfaces Format
    #18954 · opened Nov 16, 2020 by Josh Meredith   feature request
    • 3
    updated Dec 16, 2020
  • Warn for strict where bindings attached to clause with multiple GRHSs
    #18959 · opened Nov 17, 2020 by Sebastian Graf   feature request
    • 0
    updated Dec 17, 2020
  • Data.List.drop should take part in list fusion
    #18964 · opened Nov 17, 2020 by Sebastian Graf   core libraries feature request fusion
    • 0
    updated Nov 18, 2020
  • [Template Haskell] Additional information in ModuleInfo
    #18968 · opened Nov 18, 2020 by parsonsmatt   TemplateHaskell feature request
    • 1
    updated Nov 18, 2020
  • MIPS64 LLVM backend
    #18975 · opened Nov 22, 2020 by Sven Tennie   LLVM backend feature request
    • 0
    updated Dec 20, 2020
  • Allow type-checking plugins to emit custom error messages
    #18977 · opened Nov 23, 2020 by sheaf   GHC API error messages feature request plugins
    • 4
    updated Dec 04, 2020
  • Allow users to define an error message that is displayed when a constraint can't be solved
    #18978 · opened Nov 23, 2020 by sheaf   custom type errors error messages feature request
    • 1
    • 2
    updated Nov 26, 2020
  • Warnings about missing signatures (local, kind, instance)
    #18992 · opened Nov 25, 2020 by Icelandjack   error messages feature request
    • 3
    • 3
    updated Dec 04, 2020
  • Add a quick build for windows in ci pipeline
    #19006 · opened Nov 27, 2020 by Javier Neira   CI Windows feature request
    • 0
    updated Dec 04, 2020
  • Warn when a function's type indicates that it's unnecessarily monadic
    #19007 · opened Nov 28, 2020 by Joseph C. Sible   error messages feature request
    • 11
    updated Dec 14, 2020
  • Missed optimization
    #19011 · opened Nov 30, 2020 by Neo   feature request runtime perf
    • 2
    updated Dec 05, 2020
  • Implement Constant folding for Int64/Word64 on 32-bit archs
    #19024 · opened Dec 03, 2020 by Sylvain Henry   feature request
    • 0
    updated Dec 04, 2020
  • Allow heap profiling to be controlled from within a program
    #19032 · opened Dec 07, 2020 by Matthew Pickering   feature request profiling
    • 0
    updated Jan 22, 2021
  • Intrusive unpacked sums
    #19035 · opened Dec 08, 2020 by John Ericson   feature request runtime perf
    • 5
    updated Dec 10, 2020
  • Functional dependencies (for classes or type familes alike) can not refine given equality constraints
    #19043 · opened Dec 09, 2020 by John Ericson   FunctionalDependencies feature request
    • 4
    updated Jan 19, 2021
  • Linking avoidance on Windows/OS X
    #19061 · opened Dec 14, 2020 by Sylvain Henry   Windows compiler perf feature request linking macOS
    • 0
    updated Dec 14, 2020
  • Building a stage3 compiler as a(n optional?) compiler perf test in CI
    #19081 · opened Dec 17, 2020 by Sebastian Graf   CI compiler perf feature request
    • 2
    updated Dec 20, 2020
  • compact regions: Add a hash-consing variant
    #19095 · opened Dec 20, 2020 by Matthew Pickering   compact normal forms feature request
    • 1
    • 0
    updated Dec 20, 2020
  • GHC.Exts.build should be exported from a module marked {-# LANGUAGE Safe #-}
    #19127 · opened Dec 27, 2020 by Oleg Grenrus   Safe Haskell core libraries feature request primops
    • 4
    updated Feb 22, 2021
  • add "true group by" function in Data.List
    #19135 · opened Dec 30, 2020 by Philippe   feature request
    • 8
    updated Jan 02, 2021
  • HsExpr to Template Haskell
    #19148 · opened Jan 01, 2021 by Guillaume Bouchard   TemplateHaskell feature request
    • 6
    updated Jan 11, 2021
  • Optimization idea for case expression dispatch
    #19153 · opened Jan 01, 2021 by Neo   feature request runtime perf
    • 37
    updated Feb 02, 2021
  • Debug function to stop execution after x amount of times
    #19157 · opened Jan 02, 2021 by Philippe   GHCi debugger feature request
    • 1
    • 3
    updated Jan 16, 2021
  • Optimization for binary masks
    #19166 · opened Jan 04, 2021 by Sylvain Henry   feature request simplifier
    • 0
    updated Jan 07, 2021
  • `mkDumpDoc` is not exported in GHC 9.0.1
    #19172 · opened Jan 05, 2021 by Pranay Sashank   GHC API feature request
    • 2
    updated Jan 06, 2021
  • Cross-compilers should be stage2 compilers   0 of 4 tasks completed
    #19174 · opened Jan 05, 2021 by Sylvain Henry   Pnormal cross-compilation feature request
    • 1
    updated Jan 07, 2021
  • Consider using mesh style allocator for pinned objects
    #19175 · opened Jan 05, 2021 by Matthew Pickering   RTS feature request
    • 2
    updated Feb 10, 2021
  • Linear search when compiling case expression on Integers
    #19176 · opened Jan 05, 2021 by Neo   feature request runtime perf
    • 2
    updated Feb 01, 2021
  • Do not recompile when changes are confined to comments and non-significant white space
    #19184 · opened Jan 07, 2021 by David Fox   feature request recompilation checking
    • 1
    updated Jan 30, 2021
  • Guards should accept linear variables
    #19193 · opened Jan 08, 2021 by Arnaud Spiwack   LinearTypes feature request
    • 1
    updated Feb 15, 2021
  • Optimisation idea: Hylomorphism inference
    #19198 · opened Jan 09, 2021 by Sebastian Graf   feature request
    • 4
    updated Jan 10, 2021
  • GHCi should automatically enable language extensions found in a module
    #19207 · opened Jan 12, 2021 by Artyom Kazak   GHCi feature request
    • 3
    • 3
    updated Jan 30, 2021
  • Haddocks for pattern synonym fields
    #19212 · opened Jan 13, 2021 by Sebastian Graf   PatternSynonyms feature request haddock
    • 0
    updated Jan 13, 2021
  • Implicitly quantify variables in `:kind' command
    #19217 · opened Jan 14, 2021 by Icelandjack   GHCi feature request newcomer
    • 1
    • 1
    updated Jan 30, 2021
  • Move AST into it's own package
    #19218 · opened Jan 14, 2021 by John Ericson   TTG feature request
    • 1
    • 0
    updated Jan 14, 2021
  • Testrunner: Allocation report should display change even if it is to be accepted
    #19219 · opened Jan 14, 2021 by Sebastian Graf   feature request testsuite
    • 0
    updated Jan 30, 2021
  • Motivation for let/app invariant
    #19223 · opened Jan 15, 2021 by Sebastian Graf   core lint feature request float-out simplifier
    • 6
    updated Feb 12, 2021
  • Cheapness Worker/Wrapper to support eta expansion
    #19230 · opened Jan 18, 2021 by Sebastian Graf   Arity and eta expansion feature request
    • 4
    updated Jan 30, 2021
  • Support GHC2021
    #19234 · opened Jan 18, 2021 by Joachim Breitner   9.2.1   feature request
    • 2
    • 1
    • 22
    updated Feb 16, 2021
  • Recursive type families optimisation
    #19238 · opened Jan 19, 2021 by Sylvain Henry   TypeFamilies compiler perf feature request
    • 1
    updated Feb 15, 2021
  • GHCi :doc command should render haddocks
    #19254 · opened Jan 25, 2021 by Aaron Allen   GHCi feature request haddock
    • 5
    • 8
    updated Feb 06, 2021
  • Enumerate potential cases in an EmptyCase error message
    #19271 · opened Jan 28, 2021 by parsonsmatt   Pnormal feature request pattern match warnings
    • 0
    updated Jan 29, 2021
  • Implementing Passive Live Range Splitting in fregs-graph
    #19274 · opened Jan 29, 2021 by Benjamin Maurer   NCG backend Pnormal code generation feature request
    • 4
    updated Feb 08, 2021
  • Disabling worker/wrapper transformation per function
    #19276 · opened Jan 29, 2021 by Sylvain Henry   Pnormal feature request simplifier
    • 7
    updated Feb 16, 2021
  • Sections for associative operators: Parse `(x ++ y ++)` as `(\ z -> x ++ y ++ z)`
    #19281 · opened Jan 30, 2021 by Andreas Abel   feature request parser
    • 1
    • 1
    updated Feb 16, 2021
  • Rewrite rules on functions on unboxed values are not supported
    #19313 · opened Feb 03, 2021 by Richard Eisenberg   feature request rules
    • 1
    • 7
    updated Feb 16, 2021
  • Missing warning for a run-time pattern match failure
    #19327 · opened Feb 05, 2021 by Hai / @BestYeen   Pnormal error messages feature request pattern match warnings
    • 1
    • 1
    updated Feb 21, 2021
  • Allow `case` in LHS of RULE
    #19351 · opened Feb 11, 2021 by Sebastian Graf   feature request rules
    • 5
    updated Feb 16, 2021
  • Operator sections and rebindable syntax
    #19354 · opened Feb 12, 2021 by Simon Peyton Jones   Pnormal RebindableSyntax feature request
    • 0
    updated Feb 21, 2021
  • Improve fragmentation diagnostics   0 of 3 tasks completed
    #19357 · opened Feb 12, 2021 by Ben Gamari   RTS feature request runtime perf
    • 1
    • 1
    updated Feb 15, 2021
  • Template Haskell doesn't support Haskell 2010 default declarations
    #19373 · opened Feb 14, 2021 by Mario   TemplateHaskell feature request
    • 2
    updated Feb 16, 2021
  • Provide user more control about how much memory the RTS retains   0 of 3 tasks completed
    #19381 · opened Feb 15, 2021 by Matthew Pickering   RTS feature request runtime perf
    • 0
    updated Feb 22, 2021
  • Provide a `tryToGetQSem`
    #19383 · opened Feb 15, 2021 by Gauthier S.   concurrency core libraries feature request
    • 1
    • 7
    updated Feb 21, 2021
  • Surprising lack of generalisation using MonoLocalBinds
    #19396 · opened Feb 17, 2021 by Tom Ellis   feature request typechecker
    • 7
    updated Feb 24, 2021
  • GNU make job server-alike for GHC --make
    #19416 · opened Feb 22, 2021 by Adam Sandberg Eriksson   compiler perf feature request
    • 2
    • 5
    updated Feb 24, 2021
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