[commit: ghc] master: Bump Cabal submodule (6d2a9ec)

[git at git.haskell.org]

Repository : ssh://git@git.haskell.org/ghc

On branch  : master
Link       : http://ghc.haskell.org/trac/ghc/changeset/6d2a9ec2bb14c6a2f58f515b3cf011d0ab450745/ghc

>---------------------------------------------------------------

commit 6d2a9ec2bb14c6a2f58f515b3cf011d0ab450745
Author: Ben Gamari <ben at smart-cactus.org>
Date:   Mon Jul 30 19:46:13 2018 -0400

    Bump Cabal submodule


>---------------------------------------------------------------

6d2a9ec2bb14c6a2f58f515b3cf011d0ab450745
 libraries/Cabal                 | 2 +-
 testsuite/tests/driver/T4437.hs | 4 +---
 2 files changed, 2 insertions(+), 4 deletions(-)

diff --git a/libraries/Cabal b/libraries/Cabal
index 8fbacca..2a3175f 160000
--- a/libraries/Cabal
+++ b/libraries/Cabal
@@ -1 +1 @@
-Subproject commit 8fbacca029f3ad764576aefb610a0408c4b6aaad
+Subproject commit 2a3175f886b86697194256f55c9487b7cfb4dc92
diff --git a/testsuite/tests/driver/T4437.hs b/testsuite/tests/driver/T4437.hs
index a75990e..2818851 100644
--- a/testsuite/tests/driver/T4437.hs
+++ b/testsuite/tests/driver/T4437.hs
@@ -41,9 +41,7 @@ expectedGhcOnlyExtensions = ["RelaxedLayout",
                              "AlternativeLayoutRuleTransitional",
                              "DerivingVia",
                              "EmptyDataDeriving",
-                             "GeneralisedNewtypeDeriving",
-                             "StarIsType", -- FIXME: add StarIsType to cabal
-                             "QuantifiedConstraints"]
+                             "GeneralisedNewtypeDeriving"]
 
 expectedCabalOnlyExtensions :: [String]
 expectedCabalOnlyExtensions = ["Generics",