.. _release-9-6-2: Version 9.6.2 ============== The significant changes to the various parts of the compiler are listed below. See the `migration guide `_ on the GHC Wiki for specific guidance on migrating programs to this release. The :ghc-flag:`LLVM backend <-fllvm>` of this release is to be used with LLVM 11, 12, 13, 14 or 15. - A :ghc-ticket:`simplifier bug <22761>` resulting in compiler crashes in some situations involving rules has been fixed. - Several issues affecting the bytecode interpreter's handling of optimised programs have been fixed (:ghc-ticket:`23068`, :ghc-ticket:`22958`) - A specialisation bug resulting looping of some programs involving non-trivial chains of instances (namely, requiring :extension:`UndecidableInstances`) has been fixed (:ghc-ticket:`22549`) - A bug resulting in crashes of programs using the new ``listThreads#`` primop has been fixed (:ghc-ticket:`23071`). - A compiler crash triggered by certain uses of quantified constraints has been fixed (:ghc-ticket:`23171`) - Various bugs in the Javascript backend have been fixed (:ghc-ticket:`23399`, :ghc-ticket:`23360`, :ghc-ticket:`23346`) - The non-moving garbage collector's treatment of weak pointers has been revamped which should allow more reliable finalization of ``Weak#`` closures (:ghc-ticket:`22327`) - The non-moving garbage collector now bounds the amount of marking it will do during the post-marking stop-the-world phase, greatly reducing tail latencies in some programs (:ghc-ticket:`22929`) - A missing write barrier in the non-moving collector's handling of selector thunks has been fixed (:ghc-ticket:`22930`). Included libraries ------------------ The package database provided with this distribution also contains a number of packages other than GHC itself. See the changelogs provided with these packages for further change information. .. ghc-package-list:: libraries/array/array.cabal: Dependency of ``ghc`` library libraries/base/base.cabal: Core library libraries/binary/binary.cabal: Dependency of ``ghc`` library libraries/bytestring/bytestring.cabal: Dependency of ``ghc`` library libraries/Cabal/Cabal/Cabal.cabal: Dependency of ``ghc-pkg`` utility libraries/Cabal/Cabal-syntax/Cabal-syntax.cabal: Dependency of ``ghc-pkg`` utility libraries/containers/containers/containers.cabal: Dependency of ``ghc`` library libraries/deepseq/deepseq.cabal: Dependency of ``ghc`` library libraries/directory/directory.cabal: Dependency of ``ghc`` library libraries/exceptions/exceptions.cabal: Dependency of ``ghc`` and ``haskeline`` library libraries/filepath/filepath.cabal: Dependency of ``ghc`` library compiler/ghc.cabal: The compiler itself libraries/ghci/ghci.cabal: The REPL interface libraries/ghc-boot/ghc-boot.cabal: Internal compiler library libraries/ghc-boot-th/ghc-boot-th.cabal: Internal compiler library libraries/ghc-compact/ghc-compact.cabal: Core library libraries/ghc-heap/ghc-heap.cabal: GHC heap-walking library libraries/ghc-prim/ghc-prim.cabal: Core library libraries/haskeline/haskeline.cabal: Dependency of ``ghci`` executable libraries/hpc/hpc.cabal: Dependency of ``hpc`` executable libraries/integer-gmp/integer-gmp.cabal: Core library libraries/libiserv/libiserv.cabal: Internal compiler library libraries/mtl/mtl.cabal: Dependency of ``Cabal`` library libraries/parsec/parsec.cabal: Dependency of ``Cabal`` library libraries/pretty/pretty.cabal: Dependency of ``ghc`` library libraries/process/process.cabal: Dependency of ``ghc`` library libraries/stm/stm.cabal: Dependency of ``haskeline`` library libraries/template-haskell/template-haskell.cabal: Core library libraries/terminfo/terminfo.cabal: Dependency of ``haskeline`` library libraries/text/text.cabal: Dependency of ``Cabal`` library libraries/time/time.cabal: Dependency of ``ghc`` library libraries/transformers/transformers.cabal: Dependency of ``ghc`` library libraries/unix/unix.cabal: Dependency of ``ghc`` library libraries/Win32/Win32.cabal: Dependency of ``ghc`` library libraries/xhtml/xhtml.cabal: Dependency of ``haddock`` executable