Fix doctests for GHC 8.10 and 9.0 (#435)

* Fix doctests for GHC 8.10 and 9.0

Fix doctests to work for later versions of GHC. The cabal file specifies
the default language to be Haskell2010 but doctest seems to not pickup
this configuration. We fix this by passing this in as a command line
argument to doctest.

* run-ci-on-9.2.3

Author: HanStolpo

.github/workflows/ci.yml

@@ -25,7 +25,7 @@ jobs:
           - { cabal: "3.6", os: ubuntu-latest,  ghc: "8.8.4"  }
           - { cabal: "3.6", os: ubuntu-latest,  ghc: "8.10.7" }
           - { cabal: "3.6", os: ubuntu-latest,  ghc: "9.0.1"  }
-          - { cabal: "3.6", os: ubuntu-latest,  ghc: "9.2.1"  }
+          - { cabal: "3.6", os: ubuntu-latest,  ghc: "9.2.3"  }
           # Win
           - { cabal: "3.6", os: windows-latest, ghc: "8.4.4"  }
           # OOM when building tests

vector/tests/doctests.hs

@@ -1,4 +1,4 @@
 import Test.DocTest (doctest)
 
 main :: IO ()
-main = doctest ["-Iinclude", "-Iinternal", "src/Data"]
+main = doctest [ "-Iinclude" , "-Iinternal" , "-XHaskell2010" , "src/Data" ]

vector/vector.cabal

@@ -262,8 +262,10 @@ test-suite vector-doctest
   if impl(ghc >= 9.0) && impl(ghc < 9.1)
     buildable: False
   -- And GHC 9.2 too
-  if impl(ghc >= 9.2) && impl(ghc < 9.3)
+  if impl(ghc >= 9.2) && impl(ghc < 9.2.3)
     buildable: False
+  if impl(ghc >= 9.2.3) && impl(ghc < 9.3)
+    buildable: True
   build-depends:
         base      -any
       , doctest   >=0.15 && <0.21