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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 /testsuite/tests/polykinds/T9222.stderr | |
| 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 'testsuite/tests/polykinds/T9222.stderr')
| -rw-r--r-- | testsuite/tests/polykinds/T9222.stderr | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/testsuite/tests/polykinds/T9222.stderr b/testsuite/tests/polykinds/T9222.stderr index 604cc1b7ec..be80a79198 100644 --- a/testsuite/tests/polykinds/T9222.stderr +++ b/testsuite/tests/polykinds/T9222.stderr @@ -1,16 +1,16 @@ -T9222.hs:13:3: error: +T9222.hs:14:3: error: • Couldn't match type ‘c0’ with ‘c’ ‘c0’ is untouchable inside the constraints: a ~ '(b0, c0) bound by the type of the constructor ‘Want’: (a ~ '(b0, c0)) => Proxy b0 - at T9222.hs:13:3-43 + at T9222.hs:14:3-43 ‘c’ is a rigid type variable bound by the type of the constructor ‘Want’: forall i1 j1 (a :: (i1, j1)) (b :: i1) (c :: j1). ((a ~ '(b, c)) => Proxy b) -> Want a - at T9222.hs:13:3-43 + at T9222.hs:14:3-43 • In the ambiguity check for ‘Want’ To defer the ambiguity check to use sites, enable AllowAmbiguousTypes In the definition of data constructor ‘Want’ |