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Reviewers: austin, bgamari
Reviewed By: bgamari
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1988
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Signed-off-by: Austin Seipp <austin@well-typed.com>
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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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Currently checking out the source on windows requires two git
checkouts. One for the GHC sources and one for the GHC-tarballs.
This patch will make configure issue an error if compiling under
windows and the GHC-tarballs folder is missing.
On failure the user is told which command they need to run to get the
tarballs or if they want configure to handle it for them configure
provide the `--enable-tarballs-autodownload` flag.
Test Plan:
1. make sure ghc-tarballs folder is not present
2. run ./configure which should fail giving an error that tarballs is
missing and how to get it
3. run ./configure --enable-tarballs-autodownload and the tarballs
should be downloaded and configure finishes
4. rerun the command in 3, no new download should be done.
5. run configure without --enable-tarballs-autodownload, configure
should finish correctly.
Reviewers: bgamari, austin, thomie
Reviewed By: thomie
Subscribers: thomie
Differential Revision: https://phabricator.haskell.org/D1108
GHC Trac Issues: #10705
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This information is mirrored at:
http://ghc.haskell.org/trac/ghc/wiki/Building/GettingTheSources#GettingaGHCrepositoryfromGitHub
Signed-off-by: Austin Seipp <austin@well-typed.com>
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This references #8121
Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Signed-off-by: Austin Seipp <aseipp@pobox.com>
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This reverts commit 0b72347dc468ba081d67385a077238bcaa9eb4d5.
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This reverts commit e7ca132466e3c2e71f7c8fdb2b96ec87c24353be.
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Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Signed-off-by: Austin Seipp <aseipp@pobox.com>
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Patch from morabbin!
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