Changelog for singletons2.3.1
Changelog for singletons project
2.3.1
 Fix the Haddock build, thanks to @christiaanb.
2.3

Documentation clarifiation in
Data.Singletons.TypeLits
, thanks to @ivanm. 
Demote
was no longer a convenient way of callingDemoteRep
and has been removed.DemoteRep
has been renamedDemote
. 
DemoteRep
is now injective. 
Demoting a
Symbol
now givesText
. This is motivated by makingDemoteRep
injective. (IfSymbol
demoted toString
, then there would be a conflict between demoting[Char]
andSymbol
.) 
Generating singletons also now generates fixity declarations for the singletonized definitions, thanks to @intindex.

Though more an implementation detail: singletons no longer uses kindlevel proxies anywhere, thanks again to @intindex.

Support for promoting higherkinded type variables, thanks for @intindex.

Data.Singletons.TypeLits
now exports defunctionalization symbols forKnownNat
andKnownSymbol
. 
Better type inference support around constraints, as tracked in Issue #176.

Type synonym definitions are now ignored, as they should be.

Show
instances forSNat
andSSymbol
, thanks to @cumber. 
The
singFun
andunSingFun
functions no longer use proxies, preferringTypeApplications
.
2.2

With
TypeInType
, we no longer kindKProxy
. @intindex has very helpfully removed the use ofKProxy
fromsingletons
. 
Drop support for GHC 7.x.

Remove
bugInGHC
. That function was intended to work around GHC's difficulty in detecting exhaustiveness of GADT pattern matches. GHC 8 comes with a much better exhaustiveness checker, and so this function is no longer necessary.
2.1

Require
thdesugar
>= 1.6 
Work with GHC 8. GHC 8 gives the opportunity to simplify some pieces of singletons, but these opportunities are not yet fully realized. For example, injective type families means that we no longer need
Sing
to be a data family; it could be a type family. This might drastically simplify the way functions are singletonized. But not yet! 
singletons
now outputs a few more type/kind annotations to help GHC do type inference. There may be a few more programs accepted than before. (This is the fix for #136.)
2.0.1
 Lots more functions in
Data.Singletons.Prelude.List
:filter
,find
,elemIndex
,elemIndices
,findIndex
,findIndices
,intersect
,intersectBy
,takeWhile
,dropWhile
,dropWhileEnd
,span
,break
,take
,drop
,splitAt
,group
,maximum
,minimum
,insert
,sort
,groupBy
,lookup
,partition
,sum
,product
,length
,replicate
,transpose
,(!!)
,nub
,nubBy
,unionBy
,union
,genericLength
2.0.0.2
 Fix fixity of
*
.
2.0.0.1
 Make haddock work.
2.0

Instance promotion now works properly  it was quite buggy in 1.0.

Classes and instances can now be singletonized.

Limited support for functional dependencies.

We now have promoted and singletonized versions of
Enum
, as well asBounded
. 
Deriving
Enum
is also now supported. 
Ditto for
Num
, which includes an instance forNat
, naturally. 
Promoting a literal number now uses overloaded literals at the type level, using a typelevel
FromInteger
in the typelevelNum
class. 
Better support for dealing with constraints. Some previouslyunsingletonizable functions that have constrained parameters now work.

No more orphan
Quasi
instances! 
Support for functions of arity 8 (instead of the old limit, 7).

Full support for fixity declarations.

A raft of bugfixes.

Drop support for GHC 7.8. You must have GHC 7.10.2.
1.1.2.1
Fix bug #116, thus allowing locallydeclared symbols to be used in GHC 7.10.
1.1.2
 No more GHC 7.8.2 support  you must have GHC 7.8.3.
1.1.1
Update testsuite to work with thdesugar1.5.2. No functional changes.
1.1
This is a maintenance release to support building (but not testing, due to
GHC bug #10058) with 7.10. This release also targets thdesugar1.5. Some
types changed (using thdesugar's new DsMonad
instead of Quasi
), but
clients generally won't need to make any changes, unless they, too, generalize
over Quasi
.
1.0
This is a complete rewrite of the package.

A much wider array of surface syntax is now accepted for promotion and singletonization, including
let
,case
, partiallyapplied functions, and anonymous functions,where
, sections, among others. 
Classes and instances can be promoted (but not singletonized).

Derivation of promoted instances for
Ord
andBounded
.
This release can be seen as a "technology preview". More features are coming soon.
This version drops GHC 7.6 support.
0.10.0
Template Haskell names are now more hygienic. In other words, singletons
won't try to gobble up something happened to be named Sing
in your project.
(Note that the Template Haskell names are not completely hygienic; names
generated during singleton generation can still cause conflicts.)
If a function to be promoted or singletonized is missing a type signature, that is now an error, not a warning.
Added a new external module Data.Singletons.TypeLits, which contain the singletons for GHC.TypeLits. Some convenience functions are also provided.
The extension EmptyCase
is no longer needed. This caused pain when trying
to support both GHC 7.6.3 and 7.8.
0.9.3
Fix export list of Data.Singletons.TH, again again.
Add SEq
instances for Nat
and Symbol
.
0.9.2
Fix export list of Data.Singletons.TH, again.
0.9.1
Fix export list of Data.Singletons.TH.
0.9.0
Make compatible with GHC HEAD, but HEAD reports core lint errors sometimes.
Change module structure significantly. If you want to derive your own
singletons, you should import Data.Singletons.TH
. The module
Data.Singletons
now exports functions only for the use of singletons.
New modules Data.Singletons.Bool
, ...Maybe
, ...Either
, and ...List
are just like their equivalents from Data.
, except for List
, which is
quite lacking in features.
For singleton equality, use Data.Singletons.Eq
.
For propositional singleton equality, use Data.Singletons.Decide
.
New module Data.Singletons.Prelude
is meant to mirror the Haskell Prelude,
but with singleton definitions.
Streamline representation of singletons, resulting in exponential speedup at execution. (This has not been rigorously measured, but the data structures are now exponentially smaller.)
Add internal support for TypeLits, because the TypeLits module no longer exports singleton definitions.
Add support for existential singletons, through the toSing
method of
SingKind
.
Remove the SingE
class, bundling its functionality into SingKind
.
Thus, the SingRep
synonym has also been removed.
Name change: KindIs
becomes KProxy
.
Add support for singletonizing calls to error
.
Add support for singletonizing empty data definitions.
0.8.6
Make compatible with GHC HEAD, but HEAD reports core lint errors sometimes.
0.8.5
Bug fix to make singletons compatible with GHC 7.6.1.
Added git info to cabal file.
0.8.4
Update to work with latest version of GHC (7.7.20130114).
Now use branched type family instances to allow for promotion of functions with overlapping patterns.
Permit promotion of functions with constraints by omitting constraints.
0.8.3
Update to work with latest version of GHC (7.7.20121031).
Removed use of Any to simulate kind classes; now using KindOf and OfKind from GHC.TypeLits.
Made compatible with GHC.TypeLits.
0.8.2
Added this changelog
Update to work with latest version of GHC (7.6.1). (There was a change to Template Haskell).
Moved library into Data.Singletons.
0.8.1
Update to work with latest version of GHC. (There was a change to Template Haskell).
Updated dependencies in cabal to include the newer version of TH.
0.8
Initial public release