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

1 files changed, 1 insertions, 1 deletions

diff --git a/testsuite/tests/dependent/should_fail/T14066g.hs b/testsuite/tests/dependent/should_fail/T14066g.hs
index df0e03b173..b07a2c36a9 100644
--- a/testsuite/tests/dependent/should_fail/T14066g.hs
+++ b/testsuite/tests/dependent/should_fail/T14066g.hs
@@ -1,4 +1,4 @@
-{-# LANGUAGE TypeInType #-}
+{-# LANGUAGE DataKinds, PolyKinds #-}
 
 module T14066g where