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This implements the ideas originally put forward in
"System FC with Explicit Kind Equality" (ICFP'13).
There are several noteworthy changes with this patch:
* We now have casts in types. These change the kind
of a type. See new constructor `CastTy`.
* All types and all constructors can be promoted.
This includes GADT constructors. GADT pattern matches
take place in type family equations. In Core,
types can now be applied to coercions via the
`CoercionTy` constructor.
* Coercions can now be heterogeneous, relating types
of different kinds. A coercion proving `t1 :: k1 ~ t2 :: k2`
proves both that `t1` and `t2` are the same and also that
`k1` and `k2` are the same.
* The `Coercion` type has been significantly enhanced.
The documentation in `docs/core-spec/core-spec.pdf` reflects
the new reality.
* The type of `*` is now `*`. No more `BOX`.
* Users can write explicit kind variables in their code,
anywhere they can write type variables. For backward compatibility,
automatic inference of kind-variable binding is still permitted.
* The new extension `TypeInType` turns on the new user-facing
features.
* Type families and synonyms are now promoted to kinds. This causes
trouble with parsing `*`, leading to the somewhat awkward new
`HsAppsTy` constructor for `HsType`. This is dispatched with in
the renamer, where the kind `*` can be told apart from a
type-level multiplication operator. Without `-XTypeInType` the
old behavior persists. With `-XTypeInType`, you need to import
`Data.Kind` to get `*`, also known as `Type`.
* The kind-checking algorithms in TcHsType have been significantly
rewritten to allow for enhanced kinds.
* The new features are still quite experimental and may be in flux.
* TODO: Several open tickets: #11195, #11196, #11197, #11198, #11203.
* TODO: Update user manual.
Tickets addressed: #9017, #9173, #7961, #10524, #8566, #11142.
Updates Haddock submodule.
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This patch began as a modest refactoring of HsType and friends, to
clarify and tidy up exactly where quantification takes place in types.
Although initially driven by making the implementation of wildcards more
tidy (and fixing a number of bugs), I gradually got drawn into a pretty
big process, which I've been doing on and off for quite a long time.
There is one compiler performance regression as a result of all
this, in perf/compiler/T3064. I still need to look into that.
* The principal driving change is described in Note [HsType binders]
in HsType. Well worth reading!
* Those data type changes drive almost everything else. In particular
we now statically know where
(a) implicit quantification only (LHsSigType),
e.g. in instance declaratios and SPECIALISE signatures
(b) implicit quantification and wildcards (LHsSigWcType)
can appear, e.g. in function type signatures
* As part of this change, HsForAllTy is (a) simplified (no wildcards)
and (b) split into HsForAllTy and HsQualTy. The two contructors
appear when and only when the correponding user-level construct
appears. Again see Note [HsType binders].
HsExplicitFlag disappears altogether.
* Other simplifications
- ExprWithTySig no longer needs an ExprWithTySigOut variant
- TypeSig no longer needs a PostRn name [name] field
for wildcards
- PatSynSig records a LHsSigType rather than the decomposed
pieces
- The mysterious 'GenericSig' is now 'ClassOpSig'
* Renamed LHsTyVarBndrs to LHsQTyVars
* There are some uninteresting knock-on changes in Haddock,
because of the HsSyn changes
I also did a bunch of loosely-related changes:
* We already had type synonyms CoercionN/CoercionR for nominal and
representational coercions. I've added similar treatment for
TcCoercionN/TcCoercionR
mkWpCastN/mkWpCastN
All just type synonyms but jolly useful.
* I record-ised ForeignImport and ForeignExport
* I improved the (poor) fix to Trac #10896, by making
TcTyClsDecls.checkValidTyCl recover from errors, but adding a
harmless, abstract TyCon to the envt if so.
* I did some significant refactoring in RnEnv.lookupSubBndrOcc,
for reasons that I have (embarrassingly) now totally forgotten.
It had to do with something to do with import and export
Updates haddock submodule.
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As Trac #10047 points out, a quasi-quotation [n|...blah...|] is supposed
to behave exactly like $(n "...blah..."). But it doesn't! This was outright
wrong: quasiquotes were being run even inside brackets.
Now that TH supports both typed and untyped splices, a quasi-quote is properly
regarded as a particular syntax for an untyped splice. But apart from that
they should be treated the same. So this patch refactors the handling of
quasiquotes to do just that.
The changes touch quite a lot of files, but mostly in a routine way.
The biggest changes by far are in RnSplice, and more minor changes in
TcSplice. These are the places where there was real work to be done.
Everything else is routine knock-on changes.
* No more QuasiQuote forms in declarations, expressions, types, etc.
So we get rid of these data constructors
* HsBinds.QuasiQuoteD
* HsExpr.HsSpliceE
* HsPat.QuasiQuotePat
* HsType.HsQuasiQuoteTy
* We get rid of the HsQuasiQuote type altogether
* Instead, we augment the HsExpr.HsSplice type to have three
consructors, for the three types of splice:
* HsTypedSplice
* HsUntypedSplice
* HsQuasiQuote
There are some related changes in the data types in HsExpr near HsSplice.
Specifically: PendingRnSplice, PendingTcSplice, UntypedSpliceFlavour.
* In Hooks, we combine rnQuasiQuoteHook and rnRnSpliceHook into one.
A smaller, clearer interface.
* We have to update the Haddock submodule, to accommodate the hsSyn changes
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This matches GCC's choice of Unicode quotation marks (i.e. U+2018 and U+2019)
and therefore looks more familiar on the console. This addresses #2507.
Signed-off-by: Herbert Valerio Riedel <hvr@gnu.org>
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Because splices are now run in the renamer, we do not get the same error context
as we would when running in the type checker. In most cases we get less context,
and in some cases I have added additional context. Error messages should at
least tell the user that an error occurred in a splice; dropping context beyond
that point is not judged a great loss.
Note that we may now report only one error when multiple errors were reported
before because splices are now run in the renamer.
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