Commit 836fd7c6 authored by Herbert Valerio Riedel's avatar Herbert Valerio Riedel 🕺
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Add Hackage-supported `changelog.md` file



The contents has been ripped from the release notes. I've used markdown
as this may allow for automatic conversion to docbook XML in the future,
should we choose to maintain the `base` changelog in a more human-friendly
markup format and closer to the `base`-source tree.
Signed-off-by: Herbert Valerio Riedel's avatarHerbert Valerio Riedel <hvr@gnu.org>
parent be3c7faa
# Changelog for [`base` package](http://hackage.haskell.org/package/base)
## 4.7.0.0 *Feb 2014*
* Bundled with GHC 7.8.1
* The `Control.Category` module now has the `PolyKinds` extension
enabled, meaning that instances of `Category` no longer need be of
kind `* -> * -> *`.
* There are now `Foldable` and `Traversable` instances for `Either a`,
`Const r`, and `(,) a`.
* There is now a `Monoid` instance for `Const`.
* There is now a `Data` instance for `Data.Version`.
* There are now `Eq`, `Ord`, `Show` and `Read` instances for `ZipList`.
* There are now `Eq`, `Ord`, `Show` and `Read` instances for `Down`.
* There are now `Eq`, `Ord`, `Show`, `Read` and `Generic` instances
for types in GHC.Generics (`U1`, `Par1`, `Rec1`, `K1`, `M1`,
`(:+:)`, `(:*:)`, `(:.:)`).
* A zero-width unboxed poly-kinded `Proxy#` was added to
`GHC.Prim`. It can be used to make it so that there is no the
operational overhead for passing around proxy arguments to model
type application.
* `Control.Concurrent.MVar` has a new implementation of `readMVar`,
which fixes a long-standing bug where `readMVar` is only atomic if
there are no other threads running `putMVar`. `readMVar` now is
atomic, and is guaranteed to return the value from the first
`putMVar`. There is also a new `tryReadMVar` which is a
non-blocking version.
* There are now byte endian-swapping primitives available in
`Data.Word`, which use optimized machine instructions when
available.
* `Data.Bool` now exports `bool :: a -> a -> Bool -> a`, analogously
to `maybe` and `either` in their respective modules.
* Rewrote portions of `Text.Printf`, and made changes to `Numeric`
(added `Numeric.showFFloatAlt` and `Numeric.showGFloatAlt`) and
`GHC.Float` (added `formatRealFloatAlt`) to support it. The
rewritten version is extensible to user types, adds a "generic"
format specifier "`%v`", extends the `printf` spec to support much
of C's `printf(3)` functionality, and fixes the spurious warnings
about using `Text.Printf.printf` at `(IO a)` while ignoring the
return value. These changes were contributed by Bart Massey.
* The minimal complete definitions for all type-classes with cyclic
default implementations have been explicitly annotated with the
new `{-# MINIMAL #-}` pragma.
* `Control.Applicative.WrappedMonad`, which can be used to convert a
`Monad` to an `Applicative`, has now a
`Monad m => Monad (WrappedMonad m)` instance.
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