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TcSimplify.decideQuantification was doing the Wrong Thing when
"growing" the type variables to quantify over. We were trying to do
this on a tyvar set where we'd split off the dependent type varaibles;
and we just got it wrong. A kind variable wasn't being generalised
properly, with confusing knock on consequences.
All this led to Trac #13371 and Trac #13393.
This commit tidies it all up:
* The type TcDepVars is renamed as CandidateQTvs;
and splitDepVarsOfType to candidateQTyVarsOfType
* The code in TcSimplify.decideQuantification is simpler.
It no longer does the tricky "grow" stuff over TcDepVars.
Instead it use ordinary VarSets (thereby eliminating the
nasty growThetaTyVarsDSet) and uses that to filter the
result of candidateQTyVarsOfType.
* I documented that candidateQTyVarsOfType returns the type
variables in a good order in which to quantify, and rewrote
it to use an accumulator pattern, so that we would predicatably
get left-to-right ordering.
In doing all this I also made UniqDFM behave a little more nicely:
* When inserting an element that is there already, keep the old tag,
while still overwriting with the new value.
* This means that when doing udfmToList we get back elements in the
order they were originally inserted, rather than in reverse order.
It's not a big deal, but in a subsequent commit I use it to improve
the order of type variables in inferred types.
All this led to a lot of error message wibbles:
- changing the order of quantified variables
- changing the order in which instances are listed in GHCi
- changing the tidying of variables in typechecker erors
There's a submodule update for 'array' because one of its tests
has an error-message change.
I may not have associated all of them with the correct commit.
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varSetElemsWellScoped introduces unnecessary non-determinism in
inferred type signatures.
Removing this instance required changing the representation of
TcDepVars to use deterministic sets.
This is the last occurence of varSetElemsWellScoped, allowing me to
finally remove it.
Test Plan:
./validate
I will update the expected outputs when commiting, some reordering
of type variables in types is expected.
Reviewers: goldfire, simonpj, austin, bgamari
Reviewed By: simonpj
Subscribers: thomie, simonmar
Differential Revision: https://phabricator.haskell.org/D2135
GHC Trac Issues: #4012
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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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The patch "Treat out-of-scope variables as holes" makes
lots of error messages change a bit. This patch has all
the change.
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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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