darcs patch: Make toList a member of Foldable

Eelis van der Weegen eelis at eelis.net
Tue Apr 27 11:12:08 EDT 2010

The toList function in Data.Foldable is currently not a member of the
Foldable type class, and is consequently not specializable.

This is a great shame, because for data types such as [a] and

  data NonEmptyList a = NonEmptyList a [a]

conversion to list can trivially be implemented in O(1) instead of the
generic toList's O(n).

In other words, any code that directly or indirectly uses Foldable's
toList on values of these types needlessly performs O(n) conversions
where O(1) conversions are available.

Fortunately, the solution is very simple: just make toList a member of
the Foldable type class.

I have attached a patch that does just this.
-------------- next part --------------
1 patch for repository http://darcs.haskell.org/packages/base:

Tue Apr 27 16:59:15 CEST 2010  Eelis van der Weegen <eelis at eelis.net>
  * Make toList a member of Foldable.

New patches:

[Make toList a member of Foldable.
Eelis van der Weegen <eelis at eelis.net>**20100427145915
 Ignore-this: 57d9e936b41a1159283f744b10719983
] {
hunk ./Data/Foldable.hs 39
         -- ** Specialized folds
-        toList,
hunk ./Data/Foldable.hs 142
           where mf Nothing y = Just y
                 mf (Just x) y = Just (f x y)
+        -- | List of elements of a structure.
+        toList :: t a -> [a]
+        {-# INLINE toList #-}
+        toList t = build (\ c n -> foldr c n t)
+        toList = foldr (:) []
 -- instances for Prelude types
 instance Foldable Maybe where
hunk ./Data/Foldable.hs 165
         foldl = Prelude.foldl
         foldr1 = Prelude.foldr1
         foldl1 = Prelude.foldl1
+        toList = id
 instance Ix i => Foldable (Array i) where
         foldr f z = Prelude.foldr f z . elems
hunk ./Data/Foldable.hs 236
 -- These use foldr rather than foldMap to avoid repeated concatenation.
--- | List of elements of a structure.
-toList :: Foldable t => t a -> [a]
-{-# INLINE toList #-}
-toList t = build (\ c n -> foldr c n t)
-toList = foldr (:) []
 -- | The concatenation of all the elements of a container of lists.
 concat :: Foldable t => t [a] -> [a]
 concat = fold


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[Write the thunk 'next' to the MVar
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 Ignore-this: dd25636cf220131385ff2fd32493d456
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Simon Marlow <marlowsd at gmail.com>**20100318104436
 Ignore-this: 551d30280a7941c08f5c3b14576bdd70
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   2. there was a space leak (now new value is strict)
   3. using atomicModifyIORef would be slightly quicker, but can
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[Tweak docs
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Ian Lynagh <igloo at earth.li>**20100221191425] 
[nhc98 should build Data.Functor.
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[Update the exitWith docs
Ian Lynagh <igloo at earth.li>**20100213140004
 Error pointed out by Volker Wysk <vw at volker-wysk.de>
[Handle NaN, -Infinity and Infinity in the toRational for Float/Double (#3676)
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[Stifle warning about unused return value
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 Also while I was here fix an XXX: the Handle contained an
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gwern0 at gmail.com**20100108214455
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 Turns m a -> m (). Lets one call functions for their side-effects without
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 in many contexts (parsing, IO etc.); particularly good for 'forkIO' and 'forM_',
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[Replace the implementation of mergesort with a 2x faster one.
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[Add comments about double bounds-checking, and fast paths for rectangular arrays
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 Ignore-this: ea0849419dc00927aba4bd410b1cc58d
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[Fix Trac #3245: memoising typeOf
simonpj at microsoft.com**20091218155117
 Ignore-this: 5a178a7f2222293c5ee0c3c43bd1b625
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 Ignore-this: a4df9d8acf496c8e0e9ce5a520509a2a
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[De-orphan Eq/Ord Float/Double
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[Add comments to "OPTIONS_GHC -fno-warn-orphans" pragmas
Ian Lynagh <igloo at earth.li>**20091205165854] 
[Data.Either.partitionEithers was insufficiently lazy.
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 Ignore-this: d1ab9532c74a002b8075ff60febcbe2d
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[Tweak layout to work with alternative layout rule
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 This was a regression vs. 6.10.
[Remove an old comment
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[De-orphan the Eq/Ord Integer instances
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[Whitespace only
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[Derive some more instances, rather than writing them by hand
Ian Lynagh <igloo at earth.li>**20091124011747] 
[We can now derive Ord ()
Ian Lynagh <igloo at earth.li>**20091124011416] 
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[De-orphan the MonadFix ST instance for GHC
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[Rearrange the contents of Control.Monad.ST; no functionality changes
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[De-orphan the Eq/Ord Char instances
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[Move Eq/Ord Ordering instances to de-orphan them
Ian Lynagh <igloo at earth.li>**20091123194310] 
[Remove ffi warnings for nhc98.
Malcolm.Wallace at cs.york.ac.uk**20091123063743] 
[Second attempt to fix #1185 (forkProcess and -threaded)
Simon Marlow <marlowsd at gmail.com>**20091111151915
 Ignore-this: fa5f5d5e4e080d4b612a37244f937f9c
 Patch 2/2: first patch is to ghc
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   * Fix #1185: restart the IO manager after fork()
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   The main change is that we now keep track of the IO manager's ThreadId
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Ian Lynagh <igloo at earth.li>**20091104174945] 
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 This is the libraries/base part of the patch; there is a corresponding
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 The main change is that we now keep track of the IO manager's ThreadId
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 previous IO manager thread is alive before starting one.  In the child
 of fork(), we can hence call ensureIOManagerIsRunning to restart the
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[improve the documentation for throwErrnoIfRetry
Simon Marlow <marlowsd at gmail.com>**20091016112404
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 Ignore-this: 85d672649b1b776efc7e97500b05d4f9
[Inline more default methods
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 Ignore-this: 289c44b0afd6d5631c2a4e0664275ca9
 Namely Monad: (>>)
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        Num:   (-), negate
        Real:  quot, rem, div, mod, recip, (/), truncate
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Malcolm.Wallace at cs.york.ac.uk**20091013092843
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[It seems that nhc98 needs defaulting in Data.Fixed.
Malcolm.Wallace at cs.york.ac.uk**20091009135242] 
[Another instance of nhc98's strange import semantics.
Malcolm.Wallace at cs.york.ac.uk**20091009135051] 
[Make Data.Functor compatible with non-GHC compilers.
Malcolm.Wallace at cs.york.ac.uk**20091009134821] 
[Cope with nhc98's (occasionally-strange) import semantics.
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[Fix gratuitous breakage of nhc98 in System.IO.
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[Fix gratuitous breakage of nhc98 in Control.Exception.Base.
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[Fix gratuitous breakage of non-GHC in Data.Fixed.
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[Fix gratuitous breakage for non-GHC in Data.Bits.
Malcolm.Wallace at cs.york.ac.uk**20091009133257] 
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 The latter is not recognised by some iconv implementations.
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 Ignore-this: a0cff4de6dfdbcbd56a66101bc4855a9
 The following functions
     (<$) :: Functor f => a -> f b -> f a
     (*>) :: Applicative f => f a -> f b -> f b
     (<*) :: Applicative f => f a -> f b -> f a
     some :: Alternative f => f a -> f [a]
     many :: Alternative f => f a -> f [a]
 are moved into the corresponding classes, with the existing implementations
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[On Windows, use the console code page for text file encoding/decoding.
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[Fix "init" docs: the input list need not be finite. Fixes trac #3465
Ian Lynagh <igloo at earth.li>**20090911210437] 
[Bump base version to
Ian Lynagh <igloo at earth.li>**20090911153913] 
[Address #3310
Simon Marlow <marlowsd at gmail.com>**20090830152850
 Ignore-this: 40c7f7c171ee299a83092fd360a952b7
  - Rename BlockedOnDeadMVar   -> BlockedIndefinitelyOnMVar
  - Rename BlockedIndefinitely -> BlockedIndefinitelyOnSTM
  - instance Show BlockedIndefinitelyOnMVar is now
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  - instance Show BlockedIndefinitelyOnSTM is now
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 clients using Control.OldException will be unaffected (the new
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[Fix unicode conversion for MSB architectures
Ben.Lippmeier at anu.edu.au**20090830130028
 This fixes the SPARC/Solaris build.
[Fix #3441: detect errors in partial sequences
Simon Marlow <marlowsd at gmail.com>**20090830075909
 Ignore-this: d12a75d95e0cae5eb1555266810ec281
[Fix hWaitForInput
Simon Marlow <marlowsd at gmail.com>**20090827152116
 Ignore-this: 2550e911f1a4d4357a5aa8d1764238ce
 It was erroneously waiting when there were bytes to decode waiting in
 the byte buffer.
[fix debugging code
Simon Marlow <marlowsd at gmail.com>**20090827150628
 Ignore-this: e1c82fdc19a22e247cd69ff6fa11921d
[Allow for configurable iconv include and library locations.
Matthias Kilian <kili at outback.escape.de>**20090826154406
 Ignore-this: be95fab611a5534cf184b508964ed498
 This should help to fix the build on OpenBSD.
[typo in comment
Simon Marlow <marlowsd at gmail.com>**20090826085252
 Ignore-this: 1903ee0f354157a6ed3871c100f6b1b9
[un-hide some modules from the Haddock docs
Simon Marlow <marlowsd at gmail.com>**20090825152457
 Ignore-this: dce6606f93cf977fb24ebe99082dfa62
[Apply fix for #1548, from squadette at gmail.com
Simon Marlow <marlowsd at gmail.com>**20090819120700
 Ignore-this: 31c237c46a6445f588ed4b8c51bb6231
[improvements to Data.Fixed: instances for Typeable and Data, more predefined types
Ashley Yakeley <ashley at semantic.org>**20090812055058
 Ignore-this: feeece36d5632f02a05d137d2a39ab78
[Fix "Cabal check" warnings
Ian Lynagh <igloo at earth.li>**20090811215856] 
[Add a GHC.Constants module; fixes trac #3094
Ian Lynagh <igloo at earth.li>**20090809183252] 
[Apply proposal #3393
Ian Lynagh <igloo at earth.li>**20090809134717
 Add openTempFileWithDefaultPermissions and
[Add some more C wrappers; patch from Krister Walfridsson
Ian Lynagh <igloo at earth.li>**20090807200631
 Fixes 21 testsuite errors on NetBSD 5.99.
[Fixing configure for autoconf 2.64
Alexander Dunlap <alexander.dunlap at gmail.com>**20090805060748
 Ignore-this: 992ab91ae3d68c12dbb265776e33e243
[add INLINE toList
Ross Paterson <ross at soi.city.ac.uk>**20090806142853
 Ignore-this: aba16aabb17d5dca44f15d188945680e
 In anticipation of the fixing of #2353.
[fix a copyright
Simon Marlow <marlowsd at gmail.com>**20090805134045
 Ignore-this: b0ffbdd38fbba121e8bcba37c4082a60
[Tweak the BufferedIO class to enable a memory-mapped file implementation
Simon Marlow <marlowsd at gmail.com>**20090805134036
 Ignore-this: ec67d7a0a6d977438deaa342503f77e0
 We have to eliminate the assumption that an empty write buffer can be
 constructed by setting the buffer pointers to zero: this isn't
 necessarily the case when the buffer corresponds to a memory-mapped
 file, or other in-memory device implementation.
[Deprecate Control.OldException
Ian Lynagh <igloo at earth.li>**20090804143910] 
[Windows build fix, following RTS tidyup
Simon Marlow <marlowsd at gmail.com>**20090803131121
 Ignore-this: ce862fb91c2b234211a8757f98690778
[Updates to follow the RTS tidyup
Simon Marlow <marlowsd at gmail.com>**20090801220743
 Ignore-this: 6e92412df93a66c12d75344053d5634
 C functions like isDoubleNaN moved here (primFloat.c)
[Add integer-simple as a build option
Ian Lynagh <igloo at earth.li>**20090722013151] 
[Use shift[LR]Integer in the Bits Integer instance
Ian Lynagh <igloo at earth.li>**20090721222440] 
[depend directly on integer-gmp, rather than indirecting through integer
Ian Lynagh <igloo at earth.li>**20090721185228] 
[Move the instances of Functor and Monad IO to GHC.Base, to avoid orphans
Simon Marlow <marlowsd at gmail.com>**20090722102130
 Ignore-this: a7d85ac0025d559674249de0108dbcf4
[move "instance Exception Dynamic" so it isn't an orphan
Simon Marlow <marlowsd at gmail.com>**20090721093854
 Ignore-this: 5ede91ecfec2112c91b699d4de87cd02
[Improve the index checking for array accesses; fixes #2120 #2669
Ian Lynagh <igloo at earth.li>**20090719153228
 As well as checking that offset we are reading is actually inside the
 array, we now also check that it is "in range" as defined by the Ix
 instance. This fixes confusing behaviour (#2120) and improves some error
 messages (#2669).
[Make chr say what its argument was, if it's a bad argument
Ian Lynagh <igloo at earth.li>**20090718151049] 
[remove unused warning
Simon Marlow <marlowsd at gmail.com>**20090715124416
 Ignore-this: 31f613654089d0f4a44363946087b41e
[warning fix: -fno-implicit-prelude -> -XNoImplicitPrelude
Simon Marlow <marlowsd at gmail.com>**20090715122839
 Ignore-this: dc8957249731d5bcb71c01899e5adf2b
[Add hGetEncoding :: Handle -> IO (Maybe TextEncoding)
Simon Marlow <marlowsd at gmail.com>**20090715122519
 Ignore-this: 14c3eff996db062da1199739781e4708
 as suggested during the discussion on the libraries list
[Add more documentation to mkTextEncoding
Simon Marlow <marlowsd at gmail.com>**20090715122414
 Ignore-this: 97253b2624267df3a246a18121e8ea81
 noting that "//IGNORE" and "//TRANSLIT" suffixes can be used with GNU
[Add the utf8_bom codec
Simon Marlow <marlowsd at gmail.com>**20090715122257
 Ignore-this: 1c9396cd805201fe873a39382ced79c7
 as suggested during the discussion on the libraries list.
[Export Unicode and newline functionality from System.IO; update Haddock docs
Simon Marlow <marlowsd at gmail.com>**20090713113104
 Ignore-this: c3f017a555335aa55d106253393f72e2
[add a comment about the non-workingness of CHARBUF_UTF16
Simon Marlow <marlowsd at gmail.com>**20090707124406
 Ignore-this: 98d00411b68d688b3b4cffc9507b1f35
[Fix build on Windows
Ian Lynagh <igloo at earth.li>**20090711004351] 
[Fix some "warn-unused-do-bind" warnings where we want to ignore the value
Ian Lynagh <igloo at earth.li>**20090710204513] 
[Use throwErrnoIfMinus1_ when calling getrusage
Ian Lynagh <igloo at earth.li>**20090710204221] 
[Remove an unused import
Ian Lynagh <igloo at earth.li>**20090710153345] 
[reportStackOverflow now returns IO ()
Ian Lynagh <igloo at earth.li>**20090710153257
 It used to do "return undefined" to return IO a.
[GHC.Conc.reportError now returns IO ()
Ian Lynagh <igloo at earth.li>**20090710152646
 It used to return IO a, by "return undefined".
[Fix some "warn-unused-do-bind" warnings where we want to ignore the value
Ian Lynagh <igloo at earth.li>**20090710152526] 
[Minor SampleVar refactoring
Ian Lynagh <igloo at earth.li>**20090710151438] 
[Fix "warn-unused-do-bind" warnings in GHC/IO/Handle/Text.hs
Ian Lynagh <igloo at earth.li>**20090710122905] 
[Fix some "warn-unused-do-bind" warnings where we just want to ignore the result
Ian Lynagh <igloo at earth.li>**20090710005638] 
[Use the result of writeCharBuf in GHC/IO/Encoding/Latin1.hs too
Ian Lynagh <igloo at earth.li>**20090710004032] 
[Minor code tidyups in GHC.Conc
Ian Lynagh <igloo at earth.li>**20090710003801] 
[Fix "warn-unused-do-bind" warning in GHC.Conc
Ian Lynagh <igloo at earth.li>**20090710003530
 If we fail to communicate with the IO manager then we print a warning
 using debugErrLn from the ghc-prim package.
[Fix "warn-unused-do-bind" warnings in System.Posix.Internals
Ian Lynagh <igloo at earth.li>**20090709164546] 
[Fix "warn-unused-do-bind" warnings where we really do want to ignore the result
Ian Lynagh <igloo at earth.li>**20090709163912] 
[Add back imports needed on Windows
Ian Lynagh <igloo at earth.li>**20090707181924] 
[Remove unused imports
Ian Lynagh <igloo at earth.li>**20090707115810] 
[Remove unused imports from base
simonpj at microsoft.com**20090706111842
 Ignore-this: f9b5f353e3bb820f787c56d615b28765
 These unused imports are detected by the new unused-import code
[Use the result of writeCharBuf
Simon Marlow <marlowsd at gmail.com>**20090706133303
 Ignore-this: 52288dd559bf4c4f313df6197091d935
 This only makes a difference when CHARBUF_UTF16 is in use, which it
 normally isn't.  I suspect CHARBUF_UTF16 doesn't currently work for
 other reasons (CHARBUF_UTF16 was an experiment before I wrote the
 GHC.IO.Encoding.UTF* codecs), but this patch at least makes it
 slightly closer to working.
[Remove some cruft from Data.HashTable
Ian Lynagh <igloo at earth.li>**20090706181630] 
[Add 'eof' to Text.ParserCombinators.ReadP
simonpj at microsoft.com**20090706111801
 Ignore-this: 2aea7b848e00c894761bc4011adaa95d
 Add a ReadP parser that succeeds at the end of input. Very useful!
[Don't export CLDouble for GHC; fixes trac #2793
Ian Lynagh <igloo at earth.li>**20090705155120
 We never really supported CLDouble (it was a plain old double underneath),
 and pretending that we do does more harm than good.
[a byte between 0x80 and 0xBF is illegal immediately (#3341)
Simon Marlow <marlowsd at gmail.com>**20090702081415
 Ignore-this: dc19ef59a1a21118d5a7dd38aa2f611c
[avoid a warning
Simon Marlow <marlowsd at gmail.com>**20090630084134
 Ignore-this: c92a45ee216faf01327feae9fe06d6e2
[Add a wrapper for libiconv.
Matthias Kilian <kili at outback.escape.de>**20090629183634
 Ignore-this: 23c6047c0d71b745b495cc223574a47f
[#include <sys/times.h> if we have it (should fix build problems)
Simon Marlow <marlowsd at gmail.com>**20090629085351
 Ignore-this: a35e93b37ca9595c73460243180f4b9d
[set binary mode for existing FDs on Windows (fixes some GHCi test failures)
Simon Marlow <marlowsd at gmail.com>**20090626120522
 Ignore-this: 580cf636e9c77d8427aff6861d089481
[Move directory-related stuff to the unix package
Simon Marlow <marlowsd at gmail.com>**20090625120325
 Ignore-this: b997b3cbce0a46ca87ad825bbdc0a411
 now that it isn't used on Windows any more.
[TAG 2009-06-25
Ian Lynagh <igloo at earth.li>**20090625160056] 
Patch bundle hash:

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