changelog.md 17.5 KB
Newer Older
1 2
# Changelog for [`base` package](http://hackage.haskell.org/package/base)

3 4 5
## 4.9.0.0  *TBA*

  * Bundled with GHC 8.0
Austin Seipp's avatar
Austin Seipp committed
6

Eric Seidel's avatar
Eric Seidel committed
7 8 9 10
  * `error` and `undefined` now print a partial stack-trace alongside the error message.

  * New `errorWithoutStackTrace` function throws an error without printing the stack trace.

11 12 13
  * The restore operation provided by `mask` and `uninterruptibleMask` now
    restores the previous masking state whatever the current masking state is.

14 15
  * New `GHC.Generics.packageName` operation

16 17 18
  * Redesigned `GHC.Stack.CallStack` data type. As a result, `CallStack`'s
    `Show` instance produces different output, and `CallStack` no longer has an
    `Eq` instance.
19

Eric Seidel's avatar
Eric Seidel committed
20 21 22 23 24 25 26 27 28 29 30
  * New `GHC.Generics.packageName` operation

  * New `GHC.Stack.Types` module now contains the definition of
    `CallStack` and `SrcLoc`

  * New `GHC.Stack.Types.emptyCallStack` function builds an empty `CallStack`

  * New `GHC.Stack.Types.freezeCallStack` function freezes a `CallStack` preventing future `pushCallStack` operations from having any effect

  * New `GHC.Stack.Types.pushCallStack` function pushes a call-site onto a `CallStack`

31 32 33
  * New `GHC.Stack.Types.fromCallSiteList` function creates a `CallStack` from
    a list of call-sites (i.e., `[(String, SrcLoc)]`)

Eric Seidel's avatar
Eric Seidel committed
34 35 36 37 38
  * `GHC.SrcLoc` has been removed

  * `GHC.Stack.showCallStack` and `GHC.SrcLoc.showSrcLoc` are now called
    `GHC.Stack.prettyCallStack` and `GHC.Stack.prettySrcLoc` respectively

Ben Gamari's avatar
Ben Gamari committed
39 40 41
  * add `Data.List.NonEmpty` and `Data.Semigroup` (to become
    super-class of `Monoid` in the future). These modules were
    provided by the `semigroups` package previously. (#10365)
42

Ben Gamari's avatar
Ben Gamari committed
43 44 45 46
  * Add `selSourceUnpackedness`, `selSourceStrictness`, and
    `selDecidedStrictness`, three functions which look up strictness
    information of a field in a data constructor, to the `Selector` type class
    in `GHC.Generics` (#10716)
47

Ben Gamari's avatar
Ben Gamari committed
48 49 50
  * Add `URec`, `UAddr`, `UChar`, `UDouble`, `UFloat`, `UInt`, and `UWord` to
    `GHC.Generics` as part of making GHC generics capable of handling
    unlifted types (#10868)
51

Ben Gamari's avatar
Ben Gamari committed
52 53
  * Keep `shift{L,R}` on `Integer` with negative shift-arguments from
    segfaulting (#10571)
Gabriel439's avatar
Gabriel439 committed
54

Ben Gamari's avatar
Ben Gamari committed
55 56
  * Add `forkOSWithUnmask` to `Control.Concurrent`, which is like
    `forkIOWithUnmask`, but the child is run in a bound thread.
57

Ben Gamari's avatar
Ben Gamari committed
58
  * The `MINIMAL` definition of `Arrow` is now `arr AND (first OR (***))`.
59

Ben Gamari's avatar
Ben Gamari committed
60
  * The `MINIMAL` definition of `ArrowChoice` is now `left OR (+++)`.
61

62 63 64
  * Exported `GiveGCStats`, `DoCostCentres`, `DoHeapProfile`, `DoTrace`,
    `RtsTime`, and `RtsNat` from `GHC.RTS.Flags`

65 66 67
  * New function `GHC.IO.interruptible` used to correctly implement
    `Control.Exception.allowInterrupt` (#9516)

68 69 70
  * Made `PatternMatchFail`, `RecSelError`, `RecConError`, `RecUpdError`,
    `NoMethodError`, and `AssertionFailed` newtypes (#10738)

71 72 73
  * New module `Control.Monad.IO.Class` (previously provided by `transformers`
    package). (#10773)

74 75 76 77
  * New modules `Data.Functor.Classes`, `Data.Functor.Compose`,
    `Data.Functor.Product`, and `Data.Functor.Sum` (previously provided by
    `transformers` package). (#11135)

78 79 80
  * New module `Control.Monad.Fail` providing new `MonadFail(fail)`
    class (#10751)

Ben Gamari's avatar
Ben Gamari committed
81 82
  * Add `GHC.TypeLits.TypeError` and `ErrorMessage` to allow users
    to define custom compile-time error messages.
83

Ben Gamari's avatar
Ben Gamari committed
84 85
  * Redesign `GHC.Generics` to use type-level literals to represent the
    metadata of generic representation types (#9766)
86

Ben Gamari's avatar
Ben Gamari committed
87 88
  * The `IsString` instance for `[Char]` has been modified to eliminate
    ambiguity arising from overloaded strings and functions like `(++)`.
89

Ben Gamari's avatar
Ben Gamari committed
90 91
  * Move `Const` from `Control.Applicative` to its own module in
   `Data.Functor.Const`. (#11135)
92

Ben Gamari's avatar
Ben Gamari committed
93
  * Re-export `Const` from `Control.Applicative` for backwards compatibility.
joeyadams's avatar
joeyadams committed
94

Ben Gamari's avatar
Ben Gamari committed
95 96 97
  * Expand `Floating` class to include operations that allow for better
    precision: `log1p`, `expm1`, `log1pexp` and `log1mexp`. These are not
    available from `Prelude`, but the full class is exported from `Numeric`.
joeyadams's avatar
joeyadams committed
98

99 100 101
  * New `Control.Exception.TypeError` datatype, which is thrown when an
    expression fails to typecheck when run using `-fdefer-type-errors` (#10284)

Ben Gamari's avatar
Ben Gamari committed
102
### New instances
103

Ben Gamari's avatar
Ben Gamari committed
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136
  * `Alt`, `Dual`, `First`, `Last`, `Product`, and `Sum` now have `Data`,
    `MonadZip`, and `MonadFix` instances

  * `Maybe` now has a `MonadZip` instance

  * `All` and `Any` now have `Data` instances

  * `Dual`, `First`, `Last`, `Product`, and `Sum` now have `Foldable` and
    `Traversable` instances

  * `Dual`, `Product`, and `Sum` now have `Functor`, `Applicative`, and
    `Monad` instances

  * `(,) a` now has a `Monad` instance

  * `ZipList` now has `Foldable` and `Traversable` instances

  * `Identity` now has `Semigroup` and `Monoid` instances

  * `Identity` and `Const` now have `Bounded`, `Enum` and `Ix` instances

  * `Identity` and `Const` now have `Storable` instances

  * `()` now has a `Storable` instance

  * `Complex` now has `Generic`, `Generic1`, `Functor`, `Foldable`, `Traversable`,
    `Applicative`, and `Monad` instances

  * `System.Exit.ExitCode` now has a `Generic` instance

  * `Data.Version.Version` now has a `Generic` instance

  * `IO` now has a `Monoid` instance
137

138 139 140
  * Add `MonadPlus IO` and `Alternative IO` instances
    (previously orphans in `transformers`) (#10755)

141 142
  * `CallStack` now has an `IsList` instance

Ben Gamari's avatar
Ben Gamari committed
143
### Generalizations
Ben Gamari's avatar
Ben Gamari committed
144

Ben Gamari's avatar
Ben Gamari committed
145 146
  * Generalize `Debug.Trace.{traceM, traceShowM}` from `Monad` to `Applicative`
    (#10023)
147

Eric Seidel's avatar
Eric Seidel committed
148 149 150 151
  * Redundant typeclass constraints have been removed:
     - `Data.Ratio.{denominator,numerator}` have no `Integral` constraint anymore
     - **TODO**

Ben Gamari's avatar
Ben Gamari committed
152
  * Generalise `forever` from `Monad` to `Applicative`
153

Ben Gamari's avatar
Ben Gamari committed
154 155 156 157
  * Generalize `filterM`, `mapAndUnzipM`, `zipWithM`, `zipWithM_`, `replicateM`,
    `replicateM_` from `Monad` to `Applicative` (#10168)

  * The `Generic` instance for `Proxy` is now poly-kinded (#10775)
158 159 160 161 162

  * Enable `PolyKinds` in the `Data.Functor.Const` module to give `Const`
    the kind `* -> k -> *`. (#10039)


163 164 165 166 167 168 169 170 171 172
## 4.8.2.0  *Oct 2015*

  * Bundled with GHC 7.10.3

  * The restore operation provided by `mask` and `uninterruptibleMask` now
    restores the previous masking state whatever the current masking state is.

  * Exported `GiveGCStats`, `DoCostCentres`, `DoHeapProfile`, `DoTrace`,
    `RtsTime`, and `RtsNat` from `GHC.RTS.Flags`

173
## 4.8.1.0  *Jul 2015*
174 175 176

  * Bundled with GHC 7.10.2

177 178
  * `Lifetime` is now exported from `GHC.Event`

179
  * Implicit-parameter based source location support exposed in `GHC.SrcLoc` and `GHC.Stack`.
180 181
    See GHC User's Manual for more information.

182
## 4.8.0.0  *Mar 2015*
183 184 185

  * Bundled with GHC 7.10.1

186 187
  * Make `Applicative` a superclass of `Monad`

188 189
  * Add reverse application operator `Data.Function.(&)`

190 191
  * Add `Data.List.sortOn` sorting function

Simon Hengel's avatar
Simon Hengel committed
192 193
  * Add `System.Exit.die`

194 195 196 197 198 199
  * Deprecate `versionTags` field of `Data.Version.Version`.
    Add `makeVersion :: [Int] -> Version` constructor function to aid
    migration to a future `versionTags`-less `Version`.

  * Add `IsList Version` instance

200 201
  * Weaken RealFloat constraints on some `Data.Complex` functions

202 203
  * Add `Control.Monad.(<$!>)` as a strict version of `(<$>)`

204 205 206 207
  * The `Data.Monoid` module now has the `PolyKinds` extension
    enabled, so that the `Monoid` instance for `Proxy` are polykinded
    like `Proxy` itself is.

208
  * Make `abs` and `signum` handle (-0.0) correctly per IEEE-754.
209

210 211
  * Re-export `Data.Word.Word` from `Prelude`

212 213 214
  * Add `countLeadingZeros` and `countTrailingZeros` methods to
    `Data.Bits.FiniteBits` class

215 216
  * Add `Data.List.uncons` list destructor (#9550)

217 218 219 220 221 222 223
  * Export `Monoid(..)` from `Prelude`

  * Export `Foldable(..)` from `Prelude`
    (hiding `fold`, `foldl'`, `foldr'`, and `toList`)

  * Export `Traversable(..)` from `Prelude`

224 225 226
  * Set fixity for `Data.Foldable.{elem,notElem}` to match the
    conventional one set for `Data.List.{elem,notElem}` (#9610)

227 228 229
  * Turn `toList`, `elem`, `sum`, `product`, `maximum`, and `minimum`
    into `Foldable` methods (#9621)

230 231 232
  * Replace the `Data.List`-exported functions

    ```
233 234
    all, and, any, concat, concatMap, elem, find, product, sum,
    mapAccumL, mapAccumR
235 236
    ```

237 238 239 240
    by re-exports of their generalised `Data.Foldable`/`Data.Traversable`
    counterparts.  In other words, unqualified imports of `Data.List`
    and `Data.Foldable`/`Data.Traversable` no longer lead to conflicting
    definitions. (#9586)
241

242 243 244 245
  * New (unofficial) module `GHC.OldList` containing only list-specialised
    versions of the functions from `Data.List` (in other words, `GHC.OldList`
    corresponds to `base-4.7.0.2`'s `Data.List`)

246 247 248
  * Replace the `Control.Monad`-exported functions

    ```
249 250
    sequence_, msum, mapM_, forM_,
    forM, mapM, sequence
251 252
    ```

253 254 255 256
    by re-exports of their generalised `Data.Foldable`/`Data.Traversable`
    counterparts.  In other words, unqualified imports of `Control.Monad`
    and `Data.Foldable`/`Data.Traversable` no longer lead to conflicting
    definitions. (#9586)
257

258 259 260
  * Generalise `Control.Monad.{when,unless,guard}` from `Monad` to
    `Applicative` and from `MonadPlus` to `Alternative` respectively.

261 262
  * Generalise `Control.Monad.{foldM,foldM_}` to `Foldable`

David Feuer's avatar
David Feuer committed
263 264
  * `scanr`, `mapAccumL` and `filterM` now take part in list fusion (#9355,
    #9502, #9546)
265

266 267
  * Remove deprecated `Data.OldTypeable` (#9639)

268 269 270
  * New module `Data.Bifunctor` providing the `Bifunctor(bimap,first,second)`
    class (previously defined in `bifunctors` package) (#9682)

271 272 273
  * New module `Data.Void` providing the canonical uninhabited type `Void`
    (previously defined in `void` package) (#9814)

274 275
  * Update Unicode class definitions to Unicode version 7.0

276 277
  * Add `Alt`, an `Alternative` wrapper, to `Data.Monoid`. (#9759)

278 279
  * Add `isSubsequenceOf` to `Data.List` (#9767)

280 281 282 283
  * The arguments to `==` and `eq` in `Data.List.nub` and `Data.List.nubBy`
    are swapped, such that `Data.List.nubBy (<) [1,2]` now returns `[1]`
    instead of `[1,2]` (#2528, #3280, #7913)

284 285 286
  * New module `Data.Functor.Identity` (previously provided by `transformers`
    package). (#9664)

287 288 289
  * Add `scanl'`, a strictly accumulating version of `scanl`, to `Data.List`
    and `Data.OldList`. (#9368)

290 291
  * Add `fillBytes` to `Foreign.Marshal.Utils`.

292 293
  * Add new `displayException` method to `Exception` typeclass. (#9822)

294 295 296
  * Add `Data.Bits.toIntegralSized`, a size-checked version of
    `fromIntegral`. (#9816)

297 298 299 300
  * New module `Numeric.Natural` providing new `Natural` type
    representing non-negative arbitrary-precision integers.  The `GHC.Natural`
    module exposes additional GHC-specific primitives. (#9818)

301 302 303 304
  * Add `(Storable a, Integeral a) => Storable (Ratio a)` instance (#9826)

  * Add `Storable a => Storable (Complex a)` instance (#9826)

305 306
  * New module `GHC.RTS.Flags` that provides accessors to runtime flags.

307 308 309 310 311 312 313 314 315
  * Expose functions for per-thread allocation counters and limits in `GHC.Conc`

        disableAllocationLimit :: IO ()
        enableAllocationLimit :: IO ()
        getAllocationCounter :: IO Int64
        setAllocationCounter :: Int64 -> IO ()

    together with a new exception `AllocationLimitExceeded`.

316 317
  * Make `read . show = id` for `Data.Fixed` (#9240)

318
  * Add `calloc` and `callocBytes` to `Foreign.Marshal.Alloc`. (#9859)
319

320
  * Add `callocArray` and `callocArray0` to `Foreign.Marshal.Array`. (#9859)
321

322 323
  * Restore invariant in `Data (Ratio a)` instance (#10011)

324 325
  * Add/expose `rnfTypeRep`, `rnfTyCon`, `typeRepFingerprint`, and
    `tyConFingerprint` helpers to `Data.Typeable`.
326

327 328
  * Define proper `MINIMAL` pragma for `class Ix`. (#10142)

329 330 331 332 333 334 335 336
## 4.7.0.2  *Dec 2014*

  * Bundled with GHC 7.8.4

  * Fix performance bug in `Data.List.inits` (#9345)

  * Fix handling of null bytes in `Debug.Trace.trace` (#9395)

337 338 339 340 341 342 343 344 345 346 347 348 349
## 4.7.0.1  *Jul 2014*

  * Bundled with GHC 7.8.3

  * Unhide `Foreign.ForeignPtr` in Haddock (#8475)

  * Fix recomputation of `TypeRep` in `Typeable` type-application instance
    (#9203)

  * Fix regression in Data.Fixed Read instance (#9231)

  * Fix `fdReady` to honor `FD_SETSIZE` (#9168)

350
## 4.7.0.0  *Apr 2014*
351 352 353

  * Bundled with GHC 7.8.1

354 355 356 357
  * Add `/Since: 4.[4567].0.0/` Haddock annotations to entities
    denoting the package version, when the given entity was introduced
    (or its type signature changed in a non-compatible way)

358 359 360 361 362 363 364
  * 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`.

365 366
  * There are now `Show`, `Read`, `Eq`, `Ord`, `Monoid`, `Generic`, and
    `Generic1` instances for `Const`.
367 368 369

  * There is now a `Data` instance for `Data.Version`.

370 371 372 373 374
  * A new `Data.Bits.FiniteBits` class has been added to represent
    types with fixed bit-count. The existing `Bits` class is extended
    with a `bitSizeMaybe` method to replace the now obsolete
    `bitsize` method.

375 376 377
  * `Data.Bits.Bits` gained a new `zeroBits` method which completes the
    `Bits` API with a direct way to introduce a value with all bits cleared.

378 379
  * There are now `Bits` and `FiniteBits` instances for `Bool`.

380 381
  * There are now `Eq`, `Ord`, `Show`, `Read`, `Generic`. and `Generic1`
    instances for `ZipList`.
382 383 384 385 386 387 388

  * 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`,
    `(:+:)`, `(:*:)`, `(:.:)`).

389 390 391 392 393 394
  * `Data.Monoid`: There are now `Generic` instances for `Dual`, `Endo`,
    `All`, `Any`, `Sum`, `Product`, `First`, and `Last`; as well as
    `Generic1` instances for `Dual`, `Sum`, `Product`, `First`, and `Last`.

  * The `Data.Monoid.{Product,Sum}` newtype wrappers now have `Num` instances.

395 396 397
  * There are now `Functor` instances for `System.Console.GetOpt`'s
    `ArgOrder`, `OptDescr`, and `ArgDescr`.

398 399 400 401 402
  * 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.

403 404
  * New `Data.Proxy` module providing a concrete, poly-kinded proxy type.

405 406 407 408
  * New `Data.Coerce` module which exports the new `Coercible` class
    together with the `coerce` primitive which provide safe coercion
    (wrt role checking) between types with same representation.

409 410 411 412 413 414 415
  * `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.

416 417 418 419
  * New `Control.Concurrent.MVar.withMVarMasked` which executes
    `IO` action with asynchronous exceptions masked in the same style
    as the existing `modifyMVarMasked` and `modifyMVarMasked_`.

420 421 422 423 424 425 426 427 428
  * New `threadWait{Read,Write}STM :: Fd -> IO (STM (), IO ())`
    functions added to `Control.Concurrent` for waiting on FD
    readiness with STM actions.

  * Expose `Data.Fixed.Fixed`'s constructor.

  * There are now byte endian-swapping primitives
    `byteSwap{16,32,64}` available in `Data.Word`, which use
    optimized machine instructions when available.
429 430 431 432

  * `Data.Bool` now exports `bool :: a -> a -> Bool -> a`, analogously
    to `maybe` and `either` in their respective modules.

433 434 435 436 437 438 439
  * `Data.Either` now exports `isLeft, isRight :: Either a b -> Bool`.

  * `Debug.Trace` now exports `traceId`, `traceShowId`, `traceM`,
    and `traceShowM`.

  * `Data.Functor` now exports `($>)` and `void`.

440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455
  * 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.
456

457 458 459
  * There is now a `Generic` and a `Generic1` instance for `WrappedMonad`
    and `WrappedArrow`.

460 461 462 463 464 465 466 467 468 469 470
  * Handle `ExitFailure (-sig)` on Unix by killing process with signal `sig`.

  * New module `Data.Type.Bool` providing operations on type-level booleans.

  * Expose `System.Mem.performMinorGC` for triggering minor GCs.

  * New `System.Environment.{set,unset}Env` for manipulating
    environment variables.

  * Add `Typeable` instance for `(->)` and `RealWorld`.

471
  * Declare CPP header `<Typeable.h>` officially obsolete as GHC 7.8+
472 473 474 475 476 477 478 479 480
    does not support hand-written `Typeable` instances anymore.

  * Remove (unmaintained) Hugs98 and NHC98 specific code.

  * Optimize `System.Timeout.timeout` for the threaded RTS.

  * Remove deprecated functions `unsafeInterleaveST`, `unsafeIOToST`,
    and `unsafeSTToIO` from `Control.Monad.ST`.

481 482 483 484
  * Add a new superclass `SomeAsyncException` for all asynchronous exceptions
    and makes the existing `AsyncException` and `Timeout` exception children
    of `SomeAsyncException` in the hierarchy.

485 486 487 488 489 490 491 492 493
  * Remove deprecated functions `blocked`, `unblock`, and `block` from
    `Control.Exception`.

  * Remove deprecated function `forkIOUnmasked` from `Control.Concurrent`.

  * Remove deprecated function `unsafePerformIO` export from `Foreign`
    (still available via `System.IO.Unsafe.unsafePerformIO`).

  * Various fixes and other improvements (see Git history for full details).