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This is so that global test flags that control the error formatting are
propagated correctly. This patch is kind of related to: D2718
The stderr for API annotations is ignored entirely now per @alanz's
suggestion.
Test Plan: validate
Reviewers: thomie, alanz, austin, bgamari
Reviewed By: bgamari
Subscribers: alanz
Differential Revision: https://phabricator.haskell.org/D2808
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This re-working of the typechecker algorithm is based on
the paper "Visible type application", by Richard Eisenberg,
Stephanie Weirich, and Hamidhasan Ahmed, to be published at
ESOP'16.
This patch introduces -XTypeApplications, which allows users
to say, for example `id @Int`, which has type `Int -> Int`. See
the changes to the user manual for details.
This patch addresses tickets #10619, #5296, #10589.
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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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Summary:
The Parser.y production for pquals is
pquals :: { Located [[LStmt RdrName (LHsExpr RdrName)]] }
: squals '|' pquals
{% addAnnotation (gl $ last $ unLoc $1) AnnVbar (gl $2) >>
return (sLL $1 $> (reverse (unLoc $1) : unLoc $3)) }
| squals { L (getLoc $1) [reverse (unLoc $1)] }
The squals are returned in reverse order, so the AnnVbar should be
attached to the head of the list, not the last.
Test Plan: ./validate
Reviewers: hvr, austin
Reviewed By: austin
Subscribers: thomie, mpickering
Differential Revision: https://phabricator.haskell.org/D869
GHC Trac Issues: #10357
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