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This is generalizes the kind of `(->)`, as discussed in #11714.
This involves a few things,
* Generalizing the kind of `funTyCon`, adding two new `RuntimeRep`
binders,
```lang=haskell
(->) :: forall (r1 :: RuntimeRep) (r2 :: RuntimeRep)
(a :: TYPE r1) (b :: TYPE r2).
a -> b -> *
```
* Unsaturated applications of `(->)` are expressed as explicit
`TyConApp`s
* Saturated applications of `(->)` are expressed as `FunTy` as they are
currently
* Saturated applications of `(->)` are expressed by a new `FunCo`
constructor in coercions
* `splitTyConApp` needs to ensure that `FunTy`s are split to a
`TyConApp`
of `(->)` with the appropriate `RuntimeRep` arguments
* Teach CoreLint to check that all saturated applications of `(->)` are
represented with `FunTy`
At the moment I assume that `Constraint ~ *`, which is an annoying
source of complexity. This will
be simplified once D3023 is resolved.
Also, this introduces two known regressions,
`tcfail181`, `T10403`
=====================
Only shows the instance,
instance Monad ((->) r) -- Defined in ‘GHC.Base’
in its error message when -fprint-potential-instances is used. This is
because its instance head now mentions 'LiftedRep which is not in scope.
I'm not entirely sure of the right way to fix this so I'm just accepting
the new output for now.
T5963 (Typeable)
================
T5963 is now broken since Data.Typeable.Internals.mkFunTy computes its
fingerprint without the RuntimeRep variables that (->) expects. This
will be fixed with the merge of D2010.
Haddock performance
===================
The `haddock.base` and `haddock.Cabal` tests regress in allocations by
about 20%. This certainly hurts, but it's also not entirely unexpected:
the size of every function type grows with this patch and Haddock has a
lot of functions in its heap.
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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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