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| author | Vladislav Zavialov <vlad.z.4096@gmail.com> | 2018-06-14 15:02:36 -0400 |
|---|---|---|
| committer | Richard Eisenberg <rae@cs.brynmawr.edu> | 2018-06-14 15:05:32 -0400 |
| commit | d650729f9a0f3b6aa5e6ef2d5fba337f6f70fa60 (patch) | |
| tree | ac224609397d4b7ca7072fc87739d2522be7675b /libraries/base/Data/Proxy.hs | |
| parent | 4672e2ebf040feffde4e7e2d79c479e4c0c3efaf (diff) | |
| download | haskell-d650729f9a0f3b6aa5e6ef2d5fba337f6f70fa60.tar.gz | |
Embrace -XTypeInType, add -XStarIsType
Summary:
Implement the "Embrace Type :: Type" GHC proposal,
.../ghc-proposals/blob/master/proposals/0020-no-type-in-type.rst
GHC 8.0 included a major change to GHC's type system: the Type :: Type
axiom. Though casual users were protected from this by hiding its
features behind the -XTypeInType extension, all programs written in GHC
8+ have the axiom behind the scenes. In order to preserve backward
compatibility, various legacy features were left unchanged. For example,
with -XDataKinds but not -XTypeInType, GADTs could not be used in types.
Now these restrictions are lifted and -XTypeInType becomes a redundant
flag that will be eventually deprecated.
* Incorporate the features currently in -XTypeInType into the
-XPolyKinds and -XDataKinds extensions.
* Introduce a new extension -XStarIsType to control how to parse * in
code and whether to print it in error messages.
Test Plan: Validate
Reviewers: goldfire, hvr, bgamari, alanz, simonpj
Reviewed By: goldfire, simonpj
Subscribers: rwbarton, thomie, mpickering, carter
GHC Trac Issues: #15195
Differential Revision: https://phabricator.haskell.org/D4748
Diffstat (limited to 'libraries/base/Data/Proxy.hs')
| -rw-r--r-- | libraries/base/Data/Proxy.hs | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/libraries/base/Data/Proxy.hs b/libraries/base/Data/Proxy.hs index cdbb0d4956..557cc1e4dd 100644 --- a/libraries/base/Data/Proxy.hs +++ b/libraries/base/Data/Proxy.hs @@ -59,7 +59,7 @@ data Proxy t = Proxy deriving ( Bounded -- ^ @since 4.7.0.0 -- | A concrete, promotable proxy type, for use at the kind level -- There are no instances for this because it is intended at the kind level only -data KProxy (t :: *) = KProxy +data KProxy (t :: Type) = KProxy -- It's common to use (undefined :: Proxy t) and (Proxy :: Proxy t) -- interchangeably, so all of these instances are hand-written to be |