Updates for GHC 8.8

.travis.yml

@@ -4,7 +4,7 @@
 #
 # For more information, see https://github.com/haskell-CI/haskell-ci
 #
-# version: 0.3.20190429
+# version: 0.3.20190521
 #
 # This file is patched:
 # - We install the typediff utility from its repoistory.
@@ -34,6 +34,9 @@ before_cache:
   - rm -rfv $CABALHOME/packages/head.hackage
 matrix:
   include:
+    - compiler: ghc-8.8.1
+      addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.8.1","cabal-install-3.0"]}}
+      env: GHCHEAD=true
     - compiler: ghc-8.6.5
       addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-8.6.5","cabal-install-2.4"]}}
     - compiler: ghc-8.6.4
@@ -99,6 +102,8 @@ matrix:
     - compiler: ghc-7.0.1
       addons: {"apt":{"sources":["hvr-ghc"],"packages":["ghc-7.0.1","cabal-install-2.4"]}}
       env: BATTERIES=NO
+  allow_failures:
+    - compiler: ghc-8.8.1
 before_install:
   - HC=$(echo "/opt/$CC/bin/ghc" | sed 's/-/\//')
   - HCPKG="$HC-pkg"
@@ -107,32 +112,14 @@ before_install:
   - CABALHOME=$HOME/.cabal
   # install typediff
   - mkdir -p $HOME/.local/bin
-  - curl -L https://github.com/haskell-compat/base-compat/releases/download/typediff-0.1.3/typediff > $HOME/.local/bin/typediff
+  - curl -L https://github.com/haskell-compat/base-compat/releases/download/typediff-0.1.4/typediff > $HOME/.local/bin/typediff
   - chmod +x $HOME/.local/bin/typediff
   - export PATH="/opt/ghc/bin:$CABALHOME/bin:$HOME/.local/bin:$PATH"
   - TOP=$(pwd)
   - HCNUMVER=$(( $(${HC} --numeric-version|sed -E 's/([0-9]+)\.([0-9]+)\.([0-9]+).*/\1 * 10000 + \2 * 100 + \3/') ))
   - echo $HCNUMVER
   - CABAL="$CABAL -vnormal+nowrap+markoutput"
   - set -o pipefail
-  - |
-    echo 'function blue(s) { printf "\033[0;34m" s "\033[0m " }'           >> .colorful.awk
-    echo 'BEGIN { state = "output"; }'                                     >> .colorful.awk
-    echo '/^-----BEGIN CABAL OUTPUT-----$/ { state = "cabal" }'            >> .colorful.awk
-    echo '/^-----END CABAL OUTPUT-----$/ { state = "output" }'             >> .colorful.awk
-    echo '!/^(-----BEGIN CABAL OUTPUT-----|-----END CABAL OUTPUT-----)/ {' >> .colorful.awk
-    echo '  if (state == "cabal") {'                                       >> .colorful.awk
-    echo '    print blue($0)'                                              >> .colorful.awk
-    echo '  } else {'                                                      >> .colorful.awk
-    echo '    print $0'                                                    >> .colorful.awk
-    echo '  }'                                                             >> .colorful.awk
-    echo '}'                                                               >> .colorful.awk
-  - cat .colorful.awk
-  - |
-    color_cabal_output () {
-      awk -f $TOP/.colorful.awk
-    }
-  - echo text | color_cabal_output
 install:
   - ${CABAL} --version
   - echo "$(${HC} --version) [$(${HC} --print-project-git-commit-id 2> /dev/null || echo '?')]"
@@ -156,6 +143,18 @@ install:
     echo "  prefix: $CABALHOME"                         >> $CABALHOME/config
     echo "repository hackage.haskell.org"               >> $CABALHOME/config
     echo "  url: http://hackage.haskell.org/"           >> $CABALHOME/config
+  - |
+    if $GHCHEAD; then
+    echo "allow-newer: $($HCPKG list --simple-output | sed -E 's/([a-zA-Z-]+)-[0-9.]+/*:\1/g')" >> $CABALHOME/config
+
+    echo "repository head.hackage"                                                        >> $CABALHOME/config
+    echo "   url: http://head.hackage.haskell.org/"                                       >> $CABALHOME/config
+    echo "   secure: True"                                                                >> $CABALHOME/config
+    echo "   root-keys: 07c59cb65787dedfaef5bd5f987ceb5f7e5ebf88b904bbd4c5cbdeb2ff71b740" >> $CABALHOME/config
+    echo "              2e8555dde16ebd8df076f1a8ef13b8f14c66bad8eafefd7d9e37d0ed711821fb" >> $CABALHOME/config
+    echo "              8f79fd2389ab2967354407ec852cbe73f2e8635793ac446d09461ffb99527f6e" >> $CABALHOME/config
+    echo "   key-threshold: 3"                                                            >> $CABALHOME/config
+    fi
   - cat $CABALHOME/config
   - rm -fv cabal.project cabal.project.local cabal.project.freeze
   - travis_retry ${CABAL} v2-update -v
@@ -173,15 +172,15 @@ install:
   - if [ -f "./base-compat/configure.ac" ]; then (cd "./base-compat" && autoreconf -i); fi
   - if [ -f "./base-compat-batteries/configure.ac" ]; then (cd "./base-compat-batteries" && autoreconf -i); fi
   - if [ -f "./check/configure.ac" ]; then (cd "./check" && autoreconf -i); fi
-  - ${CABAL} v2-freeze -w ${HC} ${TEST} ${BENCH} | color_cabal_output
+  - ${CABAL} v2-freeze -w ${HC} ${TEST} ${BENCH}
   - "cat cabal.project.freeze | sed -E 's/^(constraints: *| *)//' | sed 's/any.//'"
   - rm  cabal.project.freeze
-  - travis_wait ${CABAL} v2-build -w ${HC} ${TEST} ${BENCH} --dep -j2 all | color_cabal_output
-  - travis_wait ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks --dep -j2 all | color_cabal_output
+  - travis_wait ${CABAL} v2-build -w ${HC} ${TEST} ${BENCH} --dep -j2 all
+  - travis_wait ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks --dep -j2 all
 script:
   - DISTDIR=$(mktemp -d /tmp/dist-test.XXXX)
   # Packaging...
-  - ${CABAL} v2-sdist all | color_cabal_output
+  - ${CABAL} v2-sdist all
   # Unpacking...
   - mv dist-newstyle/sdist/*.tar.gz ${DISTDIR}/
   - cd ${DISTDIR} || false
@@ -199,21 +198,21 @@ script:
   - cat cabal.project.local || true
   # Building...
   # this builds all libraries and executables (without tests/benchmarks)
-  - ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks all | color_cabal_output
+  - ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks all
   # Building with tests and benchmarks...
   # build & run tests, build benchmarks
-  - ${CABAL} v2-build -w ${HC} ${TEST} ${BENCH} all | color_cabal_output
+  - ${CABAL} v2-build -w ${HC} ${TEST} ${BENCH} all
   # Testing...
-  - if [ $HCNUMVER -ge 70002 ] && [ $HCNUMVER -lt 70201 ]  ||  [ $HCNUMVER -ge 70202 ] && [ $HCNUMVER -lt 70401 ]  ||  [ $HCNUMVER -ge 70402 ] && [ $HCNUMVER -lt 70801 ]  ||  [ $HCNUMVER -ge 70802 ] ; then ${CABAL} v2-test -w ${HC} ${TEST} ${BENCH} all | color_cabal_output ; fi
+  - if [ $HCNUMVER -ge 70002 ] && [ $HCNUMVER -lt 70201 ]  ||  [ $HCNUMVER -ge 70202 ] && [ $HCNUMVER -lt 70401 ]  ||  [ $HCNUMVER -ge 70402 ] && [ $HCNUMVER -lt 70801 ]  ||  [ $HCNUMVER -ge 70802 ] ; then ${CABAL} v2-test -w ${HC} ${TEST} ${BENCH} all ; fi
   # cabal check...
   - (cd base-compat-* && ${CABAL} -vnormal check)
   - if [ ! "x$BATTERIES" = "xNO" ] ; then (cd base-compat-batteries-* && ${CABAL} -vnormal check) ; fi
   - if [ ! "x$BATTERIES" = "xNO" ] ; then (cd type-check-* && ${CABAL} -vnormal check) ; fi
   # haddock...
-  - ${CABAL} v2-haddock -w ${HC} ${TEST} ${BENCH} all | color_cabal_output
+  - ${CABAL} v2-haddock -w ${HC} ${TEST} ${BENCH} all
   # Building without installed constraints for packages in global-db...
   - rm -f cabal.project.local
-  - ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks all | color_cabal_output
+  - ${CABAL} v2-build -w ${HC} --disable-tests --disable-benchmarks all
 
 # REGENDATA ["--output=.travis.yml","--config=cabal.haskell-ci","cabal.project"]
 # EOF

base-compat-batteries/CHANGES.markdown

@@ -1,3 +1,36 @@
+## Changes in 0.11.0 [????.??.??]
+ - Reexport `MonadFail(fail)` from `Prelude.Compat` and `Control.Monad.Compat`.
+
+   Because `Prelude.Compat.fail` now corresponds to the `fail` from `MonadFail`
+   instead of `Monad`, some care is required to implement `Monad.fail` on
+   pre-8.8 versions of GHC. The following template is recommended:
+
+   ```haskell
+   import Prelude.Compat
+   #if !(MIN_VERSION_base(4,13,0))
+   import qualified Control.Monad
+   #endif
+
+   data Blah a = ...
+
+   instance Functor Blah where ...
+   instance Applicative Blah where ...
+
+   instance Monad Blah where
+     (>>=) = ...
+   #if !(MIN_VERSION_base(4,13,0))
+     fail = fail -- The RHS fail corresponds to MonadFail.fail,
+                 -- /not/ Monad.fail
+   #endif
+
+   instance MonadFail Blah where
+     fail = ...
+   ```
+
+ - This coincides with the `base-compat-???` release. Refer to the
+   [`base-compat` changelog](https://github.com/haskell-compat/base-compat/blob/master/base-compat/CHANGES.markdown#changes-in-????-????????)
+   for more details.
+
 ## Changes in 0.10.5 [2018.10.18]
  - This coincides with the `base-compat-0.10.5` release. Refer to the
    [`base-compat` changelog](https://github.com/haskell-compat/base-compat/blob/master/base-compat/CHANGES.markdown#changes-in-0105-20181018)

base-compat-batteries/base-compat-batteries.cabal

@@ -1,5 +1,5 @@
 name:             base-compat-batteries
-version:          0.10.5
+version:          0.11.0
 license:          MIT
 license-file:     LICENSE
 copyright:        (c) 2012-2018 Simon Hengel,
@@ -44,6 +44,7 @@ tested-with:        GHC == 7.0.*
                   , GHC == 8.2.*
                   , GHC == 8.4.*
                   , GHC == 8.6.*
+                  , GHC == 8.8.*
 extra-source-files: CHANGES.markdown, README.markdown
 
 source-repository head
@@ -56,7 +57,7 @@ library
       -Wall
   build-depends:
       base        >= 4.3 && < 5,
-      base-compat == 0.10.5
+      base-compat == 0.11.0
   if !impl(ghc >= 7.8)
     build-depends:
       tagged >= 0.8.5 && < 0.9

base-compat-batteries/src/Control/Monad/Compat.hs

@@ -1,6 +1,8 @@
 {-# LANGUAGE CPP, NoImplicitPrelude, PackageImports #-}
 module Control.Monad.Compat (
   module Base
-  ) where
+, fail
+) where
 
-import "base-compat" Control.Monad.Compat as Base
+import "base-compat" Control.Monad.Compat as Base hiding (fail)
+import Control.Monad.Fail (fail)

base-compat-batteries/src/Prelude/Compat.hs

@@ -2,12 +2,17 @@
 module Prelude.Compat (
   module Base
 #if !(MIN_VERSION_base(4,9,0))
+, Fail.MonadFail(Fail.fail)
 , Semi.Semigroup((Semi.<>))
 #endif
 ) where
 
 import "base-compat" Prelude.Compat as Base
+#if !(MIN_VERSION_base(4,9,0))
+  hiding (fail)
+#endif
 
 #if !(MIN_VERSION_base(4,9,0))
+import "fail"       Control.Monad.Fail as Fail
 import "semigroups" Data.Semigroup as Semi
 #endif

base-compat/CHANGES.markdown

@@ -1,3 +1,41 @@
+## Changes in 0.11.0 [????.??.??]
+ - Sync with `base-4.13`/GHC 8.8
+ - Backport `MonadFail(fail)` to `Prelude.Compat` and `Control.Monad.Compat`.
+
+   Because `Prelude.Compat.fail` now corresponds to the `fail` from `MonadFail`
+   instead of `Monad`, some care is required to implement `Monad.fail` on
+   pre-8.8 versions of GHC. The following template is recommended:
+
+   ```haskell
+   import Prelude.Compat
+   #if !(MIN_VERSION_base(4,13,0))
+   import qualified Control.Monad
+   #endif
+
+   data Blah a = ...
+
+   instance Functor Blah where ...
+   instance Applicative Blah where ...
+
+   instance Monad Blah where
+     (>>=) = ...
+   #if !(MIN_VERSION_base(4,13,0))
+     fail = fail -- The RHS fail corresponds to MonadFail.fail,
+                 -- /not/ Monad.fail
+   #endif
+
+   instance MonadFail Blah where
+     fail = ...
+   ```
+
+   Note that the `MonadFail` class has only been in `base` since
+   `base-4.9`/GHC 8.0, so accordingly, this can only be backported back
+   to GHC 8.0. If you wish to have a version of
+   `Prelude.Compat`/`Control.Monad.Compat` that backports
+   `MonadFail` to older GHCs (by conditionally depending on the `fail`
+   library), use the `Prelude.Compat`/`Control.Monad.Compat` modules from the
+   `base-compat-batteries` package.
+
 ## Changes in 0.10.5 [2018.10.18]
  - Enable `BangPatterns` in `Prelude.Compat`.
 

base-compat/README.markdown

@@ -302,6 +302,8 @@ on, paired with the things that each library backports:
 
 ## Supported versions of GHC/`base`
 
+ * `ghc-8.8.1`  / `base-4.13.0.0`
+ * `ghc-8.6.5`  / `base-4.12.0.0`
  * `ghc-8.6.4`  / `base-4.12.0.0`
  * `ghc-8.6.3`  / `base-4.12.0.0`
  * `ghc-8.6.2`  / `base-4.12.0.0`

base-compat/base-compat.cabal

@@ -1,5 +1,5 @@
 name:             base-compat
-version:          0.10.5
+version:          0.11.0
 license:          MIT
 license-file:     LICENSE
 copyright:        (c) 2012-2018 Simon Hengel,
@@ -53,6 +53,7 @@ tested-with:        GHC == 7.0.*
                   , GHC == 8.2.*
                   , GHC == 8.4.*
                   , GHC == 8.6.*
+                  , GHC == 8.8.*
 extra-source-files: CHANGES.markdown, README.markdown
 
 source-repository head

base-compat/src/Control/Monad/Compat.hs

@@ -1,7 +1,11 @@
 {-# LANGUAGE CPP, NoImplicitPrelude #-}
 module Control.Monad.Compat (
   module Base
-, Monad(..)
+, Monad
+#if MIN_VERSION_base(4,9,0)
+, MonadFail
+#endif
+, fail
 , MonadPlus(..)
 #if !(MIN_VERSION_base(4,8,0))
 , foldM
@@ -31,7 +35,8 @@ module Control.Monad.Compat (
 ) where
 
 #if MIN_VERSION_base(4,9,0)
-import Control.Monad as Base
+import Control.Monad as Base hiding (fail)
+import Control.Monad.Fail as Base
 #else
 import Control.Monad as Base hiding (
     forever

base-compat/src/Prelude/Compat.hs

@@ -235,6 +235,9 @@ module Prelude.Compat (
 , Functor
 , Integral
 , Monad
+#if MIN_VERSION_base(4,9,0)
+, MonadFail
+#endif
 , Monoid
 , Num (fromInteger)
 , Ord
@@ -274,10 +277,14 @@ module Prelude.Compat (
 
 #if MIN_VERSION_base(4,9,0)
 
-import Prelude as Base
-# if MIN_VERSION_base(4,10,0) && !(MIN_VERSION_base(4,12,0))
-  hiding (($!))
+import Prelude as Base hiding (
+# if !(MIN_VERSION_base(4,13,0))
+    fail
+#  if MIN_VERSION_base(4,10,0) && !(MIN_VERSION_base(4,12,0))
+  , ($!)
+#  endif
 # endif
+  )
 
 #else
 
@@ -322,6 +329,10 @@ import Data.Word
 import Data.Semigroup as Base (Semigroup((<>)))
 #endif
 
+#if MIN_VERSION_base(4,9,0) && !(MIN_VERSION_base(4,13,0))
+import Control.Monad.Fail as Base (MonadFail(fail))
+#endif
+
 #if MIN_VERSION_base(4,10,0) && !(MIN_VERSION_base(4,12,0))
 import GHC.Exts (TYPE)
 #endif

cabal.haskell-ci

@@ -6,3 +6,5 @@ env:            7.0.1:BATTERIES=NO,
 -- TODO: Have `BATTERIES=NO` imply no tests
 tests:          (>=7.0.2 && <7.2.1) || (>=7.2.2 && <7.4.1) || (>=7.4.2 && <7.8.1) || >=7.8.2
 travis-patches: travis.yml.patch
+-- travis_wait interacts poorly with color_cabal_output
+color:          False

check/lib/Util.hs

@@ -115,7 +115,8 @@ normalizeSignatures
             -- something that we shouldn't.
             --
             _ <- P.choice
-                [ P.try (P.string "ghc-prim")
+                [ P.try (P.string "fail")
+                , P.try (P.string "ghc-prim")
                 , P.try (P.string "semigroups")
                 ]
 

check/type-check.cabal

@@ -7,7 +7,7 @@ version:             0.1.0
 synopsis:            Checks that exported type signatures match what's expected
 description:
   Checks that exported type signatures match what's expected.
-  
+
 
 author:              Simon Hengel <[email protected]>,
                      João Cristóvão <[email protected]>,
@@ -38,6 +38,7 @@ tested-with:        GHC == 7.0.*
                   , GHC == 8.2.*
                   , GHC == 8.4.*
                   , GHC == 8.6.*
+                  , GHC == 8.8.*
 library
   exposed-modules:
       TypeDump
@@ -75,7 +76,7 @@ executable dumptypes
 
 -- Run with
 -- (cd check && cabal new-run dumpindex Control.Monad.Compat)
--- 
+--
 executable dumpindex
   default-language: Haskell2010
   hs-source-dirs: exes