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# Changelog for [`template-haskell` package](http://hackage.haskell.org/package/template-haskell)
## 2.12.0.0 *TBA*
* Bundled with GHC *TBA*
* Add support for pattern synonyms. This introduces one new constructor to
`Info` (`PatSynI`), two new constructors to `Dec` (`PatSynD` and
`PatSynSigD`), and two new data types (`PatSynDir` and `PatSynArgs`),
among other changes. (#8761)
* Add support for unboxed sums. (#12478)
* Add support for visible type applications. (#12530)
* Add support for attaching deriving strategies to `deriving` statements
(#10598)
* `unboxedTupleTypeName` and `unboxedTupleDataName` now work for unboxed
0-tuples and 1-tuples (#12977)
## 2.11.0.0 *May 2016*
* Bundled with GHC 8.0.1
* The compiler can now resolve infix operator fixities in types on its own.
The `UInfixT` constructor of `Type` is analoguous to `UInfixE` for expressions
and can contain a tree of infix type applications which will be reassociated
according to the fixities of the operators. The `ParensT` constructor can be
used to explicitly group expressions.
* Add `namePackage` and `nameSpace`
* Make `dataToQa` and `dataToExpQ` able to handle `Data` instances whose
`toConstr` implementation relies on a function instead of a data
constructor (#10796)
* Add `Show` instances for `NameFlavour` and `NameSpace`
* Remove `FamilyD` and `FamFlavour`. Add `DataFamilyD` and `OpenTypeFamilyD`
as the representation of data families and open type families
respectively. (#6018)
* Add `TypeFamilyHead` for common elements of `OpenTypeFamilyD` and
`ClosedTypeFamilyD` (#10902)
* The `Strict` datatype was split among different datatypes: three for
writing the strictness information of data constructors' fields as denoted
in Haskell source code (`SourceUnpackedness` and `SourceStrictness`, as
well as `Bang`), and one for strictness information after a constructor is
compiled (`DecidedStrictness`). `Strict`, `StrictType` and `VarStrictType`
have been deprecated in favor of `Bang`, `BangType` and `VarBangType`.
(#10697)
* Add `reifyConStrictness` to query a data constructor's `DecidedStrictness`
values for its fields (#10697)
* The `ClassOpI`, `DataConI`, and `VarI` constructors no longer have a
`Fixity` field. Instead, all `Fixity` information for a given `Name` is
now determined through the `reifyFixity` function, which returns `Just` the
fixity if there is an explicit fixity declaration for that `Name`, and
`Nothing` otherwise (#10704 and #11345)
* Add `MonadFail Q` instance for GHC 8.0 and later (#11661)
* Add support for OVERLAP(S/PED/PING) pragmas on instances
## 2.10.0.0 *Mar 2015*
* Bundled with GHC 7.10.1
* Remove build-dependency on `containers` package
* Make `Pred` a type synonym of `Type`, and deprecate `classP`/`equalP` (#7021)
* Add support for `LINE` pragma via `prageLineD` and `LineP`
* Replace `Int#` with `!Int` in `NameFlavour` constructors
* Derive `Generic` for TH types (#9527)
* Add `standaloneDerivD` (#8100)
* Add support for generic default signatures via `defaultSigD` (#9064)
* Add `Lift` instances for `()` and `Rational`
* Derive new `Show` and `Data` instances for `Loc`
* Derive `Eq` instances for `Loc`, `Info`, and `ModuleInfo`
* Make calling conventions available in template haskell consistent
with those from GHC (#9703)
* Add support for `-XStaticValues` via `staticE`
* Add `Ord` instances to TH types
* Merge some instances from `th-orphans` (`Ppr` instances for `Lit`
and `Loc` as well as `Lift` instances for numeric types
* Put parens around `(ty :: kind)` when pretty-printing TH syntax
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