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|
.. _release-8-2-1:
Release notes for version 8.2.1
===============================
The significant changes to the various parts of the compiler are listed
in the following sections. There have also been numerous bug fixes and
performance improvements over the 8.0 branch.
Highlights
----------
The highlights since the 8.0 branch are:
- TODO FIXME
- SCC annotations can now be used for declarations.
Full details
------------
Language
~~~~~~~~
- TODO FIXME.
- Pattern synonym signatures can now be applied to multiple patterns, just like
value-level binding signatures. See :ref:`patsyn-typing` for details.
Compiler
~~~~~~~~
- TODO FIXME.
- Old profiling flags ``-auto-all``, ``-auto``, and ``-caf-all`` are deprecated
and their usage provokes a compile-time warning.
- Support for adding cost centres to declarations is added. The same `SCC`
syntax can be used, in addition to a new form for specifying the cost centre
name. See :ref:`scc-pragma` for examples.
- It is now possible to explicitly pick a strategy to use when deriving a
class instance using the :ghc-flag:`-XDerivingStrategies` language extension
(see :ref:`deriving-strategies`).
GHCi
~~~~
- TODO FIXME.
- Added :ghc-flag:`-flocal-ghci-history` which uses current directory for `.ghci-history`.
Template Haskell
~~~~~~~~~~~~~~~~
- TODO FIXME.
- Reifying types that contain unboxed tuples now works correctly. (Previously,
Template Haskell reified unboxed tuples as boxed tuples with twice their
appropriate arity.)
- Splicing singleton unboxed tuple types (e.g., ``(# Int #)``) now works
correctly. Previously, Template Haskell would implicitly remove the
parentheses when splicing, which would turn ``(# Int #)`` into ``Int``.
Runtime system
~~~~~~~~~~~~~~
- TODO FIXME.
- The :ref:`heap profiler <prof-heap>` can now emit heap census data to the GHC
event log, allowing heap profiles to be correlated with other tracing events
(see :ghc-ticket:`11094`).
Build system
~~~~~~~~~~~~
- TODO FIXME.
Package system
~~~~~~~~~~~~~~
- TODO FIXME.
hsc2hs
~~~~~~
- TODO FIXME.
Libraries
---------
array
~~~~~
- Version number XXXXX (was 0.5.0.0)
.. _lib-base:
base
~~~~
See ``changelog.md`` in the ``base`` package for full release notes.
- Version number 4.10.0.0 (was 4.9.0.0)
- ``Data.Either`` now provides ``fromLeft`` and ``fromRight``
- ``Data.Type.Coercion`` now provides ``gcoerceWith``, which is analogous to
``gcastWith`` from ``Data.Type.Equality``.
- The ``Read1`` and ``Read2`` classes in ``Data.Functor.Classes`` have new
methods, ``liftReadList(2)`` and ``liftReadListPrec(2)``, that are defined in
terms of ``ReadPrec`` instead of ``ReadS``. This matches the interface
provided in GHC's version of the ``Read`` class, and allows users to write
more efficient ``Read1`` and ``Read2`` instances.
binary
~~~~~~
- Version number XXXXX (was 0.7.1.0)
bytestring
~~~~~~~~~~
- Version number XXXXX (was 0.10.4.0)
Cabal
~~~~~
- Version number XXXXX (was 1.18.1.3)
containers
~~~~~~~~~~
- Version number XXXXX (was 0.5.4.0)
deepseq
~~~~~~~
- Version number XXXXX (was 1.3.0.2)
directory
~~~~~~~~~
- Version number XXXXX (was 1.2.0.2)
filepath
~~~~~~~~
- Version number XXXXX (was 1.3.0.2)
ghc
~~~
-
ghc-boot
~~~~~~~~
- This is an internal package. Use with caution.
- TODO FIXME.
ghc-prim
~~~~~~~~
- Version number XXXXX (was 0.3.1.0)
- Added new ``isByteArrayPinned#`` and ``isMutableByteArrayPinned#`` operation.
- New function ``noinline`` in ``GHC.Magic`` lets you mark that a function
should not be inlined. It is optimized away after the simplifier runs.
haskell98
~~~~~~~~~
- Version number XXXXX (was 2.0.0.3)
haskell2010
~~~~~~~~~~~
- Version number XXXXX (was 1.1.1.1)
hoopl
~~~~~
- Version number XXXXX (was 3.10.0.0)
hpc
~~~
- Version number XXXXX (was 0.6.0.1)
integer-gmp
~~~~~~~~~~~
- Version number XXXXX (was 0.5.1.0)
old-locale
~~~~~~~~~~
- Version number XXXXX (was 1.0.0.6)
old-time
~~~~~~~~
- Version number XXXXX (was 1.1.0.2)
process
~~~~~~~
- Version number XXXXX (was 1.2.0.0)
template-haskell
~~~~~~~~~~~~~~~~
- Version number XXXXX (was 2.9.0.0)
- Added support for unboxed sums :ghc-ticket:`12478`.
- Added support for visible type applications :ghc-ticket:`12530`.
time
~~~~
- Version number XXXXX (was 1.4.1)
unix
~~~~
- Version number XXXXX (was 2.7.0.0)
Win32
~~~~~
- Version number XXXXX (was 2.3.0.1)
Known bugs
----------
- TODO FIXME
|
