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# Changelog for [`template-haskell` package](http://hackage.haskell.org/package/template-haskell)
## 2.17.0.0
* Implement Overloaded Quotations (GHC Proposal #246). This patch modifies a
few fundamental things in the API. All the library combinators are generalised
to be in terms of a new minimal class `Quote`. The type of `lift` and `liftTyped`
are modified to return `m Exp` rather than `Q Exp`. Instances written in terms
of `Q` are now disallowed. The types of `unsafeTExpCoerce` and `unTypeQ`
are also generalised in terms of `Quote` rather than specific to `Q`.
## 2.16.0.0 *TBA*
* Add support for tuple sections. (#15843) The type signatures of `TupE` and
`UnboxedTupE` have changed from `[Exp] -> Exp` to `[Maybe Exp] -> Exp`.
The type signatures of `tupE` and `unboxedTupE` remain the same for
backwards compatibility.
* Introduce a `liftTyped` method to the `Lift` class and set the default
implementations of `lift` in terms of `liftTyped`.
* Add a `ForallVisT` constructor to `Type` to represent visible, dependent
quantification.
* Introduce support for `Bytes` literals (raw bytes embedded into the output
binary)
* Make the `Lift` typeclass levity-polymorphic and add instances for unboxed
tuples, unboxed sums, `Int#`, `Word#`, `Addr#`, `Float#`, and `Double#`.
* Introduce `reifyType` to reify the type or kind of a thing referenced by
`Name`.
## 2.15.0.0 *May 2019*
* In `Language.Haskell.TH.Syntax`, `DataInstD`, `NewTypeInstD`, `TySynEqn`,
and `RuleP` now all have a `Maybe [TyVarBndr]` argument, which contains a
list of quantified type variables if an explicit `forall` is present, and
`Nothing` otherwise. `DataInstD`, `NewTypeInstD`, `TySynEqn` also now use
a single `Type` argument to represent the left-hand-side to avoid
malformed type family equations and allow visible kind application.
Correspondingly, in `Language.Haskell.TH.Lib.Internal`, `pragRuleD`,
`dataInstD`, `newtypeInstD`, and `tySynEqn` now all have a
`Maybe [TyVarBndrQ]` argument. Non-API-breaking versions of these
functions can be found in `Language.Haskell.TH.Lib`. The type signature
of `tySynEqn` has also changed from `[TypeQ] -> TypeQ -> TySynEqnQ` to
`(Maybe [TyVarBndrQ]) -> TypeQ -> TypeQ -> TySynEqnQ`, for the same reason
as in `Language.Haskell.TH.Syntax` above. Consequently, `tySynInstD` also
changes from `Name -> TySynEqnQ -> DecQ` to `TySynEqnQ -> DecQ`.
* Add `Lift` instances for `NonEmpty` and `Void`
* `addForeignFilePath` now support assembler sources (#16180).
## 2.14.0.0 *September 2018*
* Introduce an `addForeignFilePath` function, as well as a corresponding
`qAddForeignFile` class method to `Quasi`. Unlike `addForeignFile`, which
takes the contents of the file as an argument, `addForeignFilePath` takes
as an argument a path pointing to a foreign file. A new `addForeignSource`
function has also been added which takes a file's contents as an argument.
The old `addForeignFile` function is now deprecated in favor of
`addForeignSource`, and the `qAddForeignFile` method of `Quasi` has been
removed entirely.
* Introduce an `addTempFile` function, as well as a corresponding
`qAddTempFile` method to `Quasi`, which requests a temporary file of
a given suffix.
* Add a `ViaStrategy` constructor to `DerivStrategy`.
* Add support for `-XImplicitParams` via `ImplicitParamT`,
`ImplicitParamVarE`, and `ImplicitParamBindD`.
* Add support for `-XRecursiveDo` via `MDoE` and `RecS`.
## 2.13.0.0 *March 2018*
* Bundled with GHC 8.4.1
* `Language.Haskell.TH.FamFlavour`, which was deprecated in 2.11,
has been removed.
* Add support for overloaded labels. Introduces `labelE :: String -> ExpQ`.
* Add `KindQ`, `TyVarBndrQ`, and `FamilyResultSigQ` aliases to
`Language.Haskell.TH.Lib`.
* Add `Language.Haskell.TH.Lib.Internal` module, which exposes some
additional functionality that is used internally in GHC's integration
with Template Haskell. This is not a part of the public API, and as
such, there are no API guarantees for this module from version to version.
* `MonadIO` is now a superclass of `Quasi`, `qRunIO` has a default
implementation `qRunIO = liftIO`
* Add `MonadIO Q` instance
## 2.12.0.0 *July 2017*
* Bundled with GHC 8.2.1
* 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)
* Add support for `COMPLETE` pragmas. (#13098)
* `unboxedTupleTypeName` and `unboxedTupleDataName` now work for unboxed
0-tuples and 1-tuples (#12977)
* `Language.Haskell.TH` now reexports all of `Language.Haskell.TH.Lib`.
(#12992). This causes `Language.Haskell.TH` to export more types and
functions that it did before:
- `TExp`, `BangQ`, and `FieldExpQ`
- `unboxedTupP`, `unboxedTupE` and `unboundVarE`
- `infixLD`, `infixRD`, and `infixND`
- `unboxedTupleT` and `wildCardT`
- `plainTV` and `kindedTV`
- `interruptible` and `funDep`
- `valueAnnotation`, `typeAnnotation`, and `moduleAnnotation`
* Add support for overloaded labels.
## 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
|
