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  • ghc 9.0.1

Last edited by Hécate Moonlight Jan 01, 2021
Page history New page

ghc 9.0.1

GHC plans for 9.0.1

This page is our road-map for what will be in GHC %9.0.1.

If you believe your favorite thing belongs in this list, but isn't there, please yell. If it's not in the road map, it probably won't get done. Without a lot of support, many things in the road map won't get done either, so we need your help!

Dates

  • 16 June 2020: Beginning of feature freeze
  • Late June 2020: Cut branch
  • Mid september 2020: Alpha releases
  • ~24 September 2020: Beta release
  • Week of 5th October 2020: Final release candidate

Migration details

See Migration/9.0.

Release highlights (planned)

Below are the major highlights of the 9.0 series.

Compiler

  • Linear Types (@aspiwack, !852 (closed), #15981 (closed))
  • QualifiedDo (@matt, Proposal #216)
  • Signalling NaNs (@carter, #16519)
  • NCG register allocation improvements (@AndreasK)
  • Various documentation improvements (@Kleidukos)
  • Simplified subsumption (@simonpj)
  • Explicit specificity in type variable binders (@Gertjan423, #16393 (closed))
  • keepAlive# (#17760 (closed), @bgamari)
  • Improvements in code generation for runRW# (#15127 (closed), @bgamari)
  • Refactoring of GHC module hierarchy (#13009 (closed), @hsyl20)
  • New Darwin packaging (#17418, #17854, @trac-conradwt)
  • New Windows packaging? (#18104)
  • WinIO IO manager for Windows (@Phyx, @AndreasK)
  • Reduce FastString memory consumption (!1675 (closed), @dxld)
  • Improved GC behavior due to ModIface in compact region (@mpickering)
  • Make Q (TExp a) a newtype (@mpickering, !3358 (closed), Proposal 195)
  • AArch64 linker fixes (@angerman)
  • unified ghc-bignum package (!2231 (closed), @hsyl20)

Runtime system

  • Further improvements to the low-latency garbage collector (@bgamari)
  • Implement interfaces needed by ghc-debug (!1435 (closed))

Build system and miscellaneous changes

  • The Hadrian build system will hopefully become the default (%Make removal)
  • The GHCi prompt does not display the loaded modules by default anymore (#18702 (closed))
  • Data.Foldable methods maximum{,By}, minimum{,By}, product and sum are now strict by default, as well as the methods used in the List instance (#17867, !4675 (closed))

Tickets

See the %9.0.1 milestone.

See also GHC 9.0 tracking ticket.

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