2.3. Version 9.2.3¶
The significant changes to the various parts of the compiler are listed in the following sections.
The LLVM backend of this release is to be used with LLVM
9, 10, 11, or 12.
2.3.1. Compiler¶
- Fix a bug causing compiler panics on certain RULE declarations (#20820).
- Fix a typechecker regression on certain programs involving type families and type equality constraints (#21473, #21515).
- Fix a typechecker regression affecting programs involving quantified constraints and superclasses (#20582)
- Fix a typechecker bug causing compiler panics on certain programs involing GADTs and Type Families (#20820).
- Fix a typechecker panic on certain programs involving typed holes (#21130).
- Fix a typechecker panic arising from uninferrable variables in a pattern synonym (#21479).
- Various other typechecker bug fixes (#21531, #21516, #21519).
- Ensure that XMM registers are preserved according to the calling convention on Win64 (#21465).
- Fix a bug in the STG pipeline leading to segfaults in certain situations (#21396).
- Fix a code generator bug causing CAFs to be incorrectly GC’d (#20959).
- Improve error messages for OverloadedRecordFields in the case of ambiguous fields (#17420).
- Improve warnings for redundant constraints (#20602).
2.3.2. Runtime system¶
- Fix a bug with RTS accounting resulting in computing incorrect and negative productivity stats (#21082).
2.3.3. GHCi¶
- Fix a bug causing certain type signatures to be pretty printed in a unpleasant way (#20974).
2.3.4. Core libraries¶
2.3.5. Build system and packaging¶
- Use POSIX compatible shell syntax for redirecting output during configure (#20760).
- Only copy and install libffi headers when using in-tree libffi (#21485, #21487).
- Add support for bootstrapping hadrian without needing
cabal-install. - Allow installing hadrian generated binary distributions to paths including the string “xxx” (#21402)
- Allow bootstrapping from GHC 9.2.
- Allow running the testsuite using Python 3.10.
2.3.6. 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.
| Package | Version | Reason for inclusion |
|---|---|---|
| ghc | 9.2.7 | The compiler itself |
| Cabal | 3.6.3.0 | Dependency of ghc-pkg utility |
| Win32 | 2.12.0.1 | Dependency of ghc library |
| array | 0.5.4.0 | Dependency of ghc library |
| base | 4.16.4.0 | Core library |
| binary | 0.8.9.0 | Dependency of ghc library |
| bytestring | 0.11.4.0 | Dependency of ghc library |
| containers | 0.6.5.1 | Dependency of ghc library |
| deepseq | 1.4.6.1 | Dependency of ghc library |
| directory | 1.3.6.2 | Dependency of ghc library |
| exceptions | 0.10.4 | Dependency of ghc and haskeline library |
| filepath | 1.4.2.2 | Dependency of ghc library |
| ghc-boot-th | 9.2.7 | Internal compiler library |
| ghc-boot | 9.2.7 | Internal compiler library |
| ghc-compact | 0.1.0.0 | Core library |
| ghc-heap | 9.2.7 | GHC heap-walking library |
| ghc-prim | 0.8.0 | Core library |
| ghci | 9.2.7 | The REPL interface |
| haskeline | 0.8.2 | Dependency of ghci executable |
| hpc | 0.6.1.0 | Dependency of hpc executable |
| integer-gmp | 1.1 | Core library |
| libiserv | 9.2.7 | Internal compiler library |
| mtl | 2.2.2 | Dependency of Cabal library |
| parsec | 3.1.15.0 | Dependency of Cabal library |
| pretty | 1.1.3.6 | Dependency of ghc library |
| process | 1.6.16.0 | Dependency of ghc library |
| stm | 2.5.0.2 | Dependency of haskeline library |
| template-haskell | 2.18.0.0 | Core library |
| terminfo | 0.4.1.5 | Dependency of haskeline library |
| text | 1.2.5.0 | Dependency of Cabal library |
| time | 1.11.1.1 | Dependency of ghc library |
| transformers | 0.5.6.2 | Dependency of ghc library |
| unix | 2.7.2.2 | Dependency of ghc library |
| xhtml | 3000.2.2.1 | Dependency of haddock executable |