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- Add 19 new messages. Update test outputs accordingly.
- Pretty print suggest-extensions hints: remove space before
interspersed commas.
- Refactor Rank's MonoType constructors. Each MonoType constructor
should represent a specific case. With the Doc suggestion belonging
to the TcRnMessage diagnostics instead.
- Move Rank from Validity to its own `GHC.Tc.Types.Rank` module.
- Remove the outdated `check_irred_pred` check.
- Remove the outdated duplication check in `check_valid_theta`, which
was subsumed by `redundant-constraints`.
- Add missing test cases for quantified-constraints/T16474 & th/T12387a.
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Summary: Rank2Types is deprecated. Don't suggest to users to use it.
Reviewers: bgamari, RyanGlScott, simonpj
Reviewed By: RyanGlScott, simonpj
Subscribers: RyanGlScott, rwbarton, carter
GHC Trac Issues: #16000
Differential Revision: https://phabricator.haskell.org/D5447
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This patch finally makes it possible to have explicit
foralls in an instance decl
instance forall (a :: *). Eq a => Eq [a] where ...
This is useful to allow kind signatures or indeed
explicicit kind for-alls; see Trac #11519
I thought it would be really easy, because an instance
declaration already contains an actual HsSigType, so all
the syntactic baggage is there. But in fact it turned
out that instance declarations were kind-checked a
little differently, because the body kind of the forall
is 'Constraint' rather than '*'.
So I fixed that. There a slight kludge
(see Note [Body kind of a HsQualTy], but it's still a
significant improvement.
I also did the usual other round of refactoring,
improved a few error messages, tidied up comments etc.
The only significant aspect of all that was
* Kill mkNakedSpecSigmaTy, mkNakedPhiTy, mkNakedFunTy
These function names suggest that they do something
complicated, but acutally they do nothing. So I
killed them.
* Swap the arg order of mkNamedBinder, just so that it is
convenient to say 'map (mkNamedBinder Invisible) tvs'
* I had to improve isPredTy, to deal with (illegal)
types like
(Eq a => Eq [a]) => blah
See Note [isPeredTy complications] in Type.hs
Still to come: user manual documentation for the
instance-decl change.
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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 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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(this is related to #3647)
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