2.1. Version 9.14.1¶
The significant changes to the various parts of the compiler are listed in the following sections. See the migration guide on the GHC Wiki for specific guidance on migrating programs to this release.
2.1.1. Language¶
-Wincomplete-record-selectorsis now part of -Wall, as specified by GHC Proposal 516: add warning for incomplete record selectors <https://github.com/ghc-proposals/ghc-proposals/blob/master/proposals/0516-incomplete-record-selectors.rst>_. Hence, if a library is compiled with-Werror, compilation may now fail. Solution: fix the library. Workaround: add-Werror=no-incomplete-record-selectors.Note that this warning is at least as serious as a warning about missing patterns from a function definition, perhaps even more so, since it is invisible in the source program.
The combination of
ScopedTypeVariablesandTypeApplicationsno longer enables type applications in patterns, which now always requiresTypeAbstractions. The warning flag``deprecated-type-abstractions`` has also been removed from the compiler.
2.1.2. Compiler¶
An improved error message is introduced to refer users to the heap-controlling flags of the RTS when there is a heap overflow during compilation. (#25198)
2.1.3. GHCi¶
2.1.4. Runtime system¶
Add new runtime flag
--optimistic-linkingwhich instructs the runtime linker to continue in the presence of unknown symbols. By default this flag is not passed, preserving previous behavior.
2.1.5. Cmm¶
2.1.6. base library¶
2.1.7. ghc-prim library¶
2.1.8. ghc library¶
2.1.9. ghc-heap library¶
The functions getClosureInfoTbl_maybe, getClosureInfoTbl, getClosurePtrArgs and getClosurePtrArgs_maybe have been added to allow reading of the relevant Closure attributes without reliance on incomplete selectors.
2.1.10. ghc-experimental library¶
ghc-experimentalnow exposesGHC.RTS.FlagsandGHC.StatsasGHC.RTS.Flags.ExperimentalandGHC.Stats.Experimental. These are also exposed inbase, however thebaseversions will be deprecated as part of the split base project. See CLC proposal 289. Downstream consumers of these flags are encouraged to migrate to theghc-experimentalversions.
2.1.11. template-haskell library¶
2.1.12. 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 |
9.13 | The compiler itself |
Cabal-syntax |
3.14.0.0 | Dependency of |
Cabal |
3.14.0.0 | Dependency of |
Win32 |
2.14.0.0 | Dependency of |
array |
0.5.8.0 | Dependency of |
base |
4.20.0.0 | Core library |
binary |
0.8.9.1 | Dependency of |
bytestring |
0.12.1.0 | Dependency of |
containers |
0.7 | Dependency of |
deepseq |
1.5.1.0 | Dependency of |
directory |
1.3.9.0 | Dependency of |
exceptions |
0.10.7 | Dependency of |
file-io |
0.1.2 | Dependency of |
filepath |
1.5.2.0 | Dependency of |
ghc-boot-th |
9.13 | Internal compiler library |
ghc-boot |
9.13 | Internal compiler library |
ghc-compact |
0.1.0.0 | Core library |
ghc-heap |
9.13 | GHC heap-walking library |
ghc-prim |
0.11.0 | Core library |
ghci |
9.13 | The REPL interface |
haskeline |
0.8.2.1 | Dependency of |
hpc |
0.7.0.1 | Dependency of |
integer-gmp |
1.1 | Core library |
mtl |
2.3.1 | Dependency of |
os-string |
2.0.4 | Dependency of |
parsec |
3.1.17.0 | Dependency of |
pretty |
1.1.3.6 | Dependency of |
process |
1.6.25.0 | Dependency of |
stm |
2.5.3.1 | Dependency of |
template-haskell |
2.22.1.0 | Core library |
terminfo |
0.4.1.6 | Dependency of |
text |
2.1.2 | Dependency of |
time |
1.14 | Dependency of |
transformers |
0.6.1.1 | Dependency of |
unix |
2.8.5.1 | Dependency of |
xhtml |
3000.2.2.1 | Dependency of |
haddock-api |
2.30.0 | Dependency of |
haddock-library |
1.11.0 | Dependency of |