llvm 9?

[seanjensengrey]

I assume it would be fairly difficult to upgrade to llvm 9?

Cabal-2.0.1.1: copy/register                     
llvm-hs-5.1.3: download      
llvm-hs-5.1.3: configure     
Progress 20/22               

--  While building custom Setup.hs for package llvm-hs-5.1.3 using:
      /private/var/folders/dg/dcnc7sqd7_5fmy5ctdmngzch0000gp/T/stack28299/llvm-hs-5.1.3/.stack-work/dist/x86_64-osx/Cabal-2.0.1.0/setup/setup --builddir=.stack-work/dist/x86_64-osx/Cabal-2.0.1.0 configure --with-ghc=/Users/seanj/.stack/programs/x86_64-osx/ghc-8.2.2/bin/ghc --with-ghc-pkg=/Users/seanj/.stack/programs/x86_64-osx/ghc-8.2.2/bin/ghc-pkg --user --package-db=clear --package-db=global --package-db=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/pkgdb --libdir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/lib --bindir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/bin --datadir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/share --libexecdir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/libexec --sysconfdir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/etc --docdir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/doc/llvm-hs-5.1.3 --htmldir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/doc/llvm-hs-5.1.3 --haddockdir=/Users/seanj/.stack/snapshots/x86_64-osx/lts-11.22/8.2.2/doc/llvm-hs-5.1.3 --dependency=Cabal=Cabal-2.0.1.1-ARIl7MGNKZFBAH1HVzpC6s --dependency=array=array-0.5.2.0 --dependency=attoparsec=attoparsec-0.13.2.2-4OZxs7pjlk4KaC70yK831H --dependency=base=base-4.10.1.0 --dependency=bytestring=bytestring-0.10.8.2 --dependency=containers=containers-0.5.10.2 --dependency=exceptions=exceptions-0.8.3-CYMTujxEbkkJnOJ7pW82ZD --dependency=llvm-hs-pure=llvm-hs-pure-5.1.2-DfeAcfdakR5AmUSpKHmZqE --dependency=mtl=mtl-2.2.2-8XubxMJDT8QLsstvlNotkc --dependency=template-haskell=template-haskell-2.12.0.0 --dependency=transformers=transformers-0.5.2.0 --dependency=utf8-string=utf8-string-1.0.1.1-7sQ7eR5H5ED7poickls5aO
    Process exited with code: ExitFailure 1
    Logs have been written to: /Users/seanj/tt/git-archives/sam46/Paskell/.stack-work/logs/llvm-hs-5.1.3.log

    [1 of 2] Compiling Main             ( /private/var/folders/dg/dcnc7sqd7_5fmy5ctdmngzch0000gp/T/stack28299/llvm-hs-5.1.3/Setup.hs, /private/var/folders/dg/dcnc7sqd7_5fmy5ctdmngzch0000gp/T/stack28299/llvm-hs-5.1.3/.stack-work/dist/x86_64-osx/Cabal-2.0.1.0/setup/Main.o )
    [2 of 2] Compiling StackSetupShim   ( /Users/seanj/.stack/setup-exe-src/setup-shim-mPHDZzAJ.hs, /private/var/folders/dg/dcnc7sqd7_5fmy5ctdmngzch0000gp/T/stack28299/llvm-hs-5.1.3/.stack-work/dist/x86_64-osx/Cabal-2.0.1.0/setup/StackSetupShim.o )
    Linking /private/var/folders/dg/dcnc7sqd7_5fmy5ctdmngzch0000gp/T/stack28299/llvm-hs-5.1.3/.stack-work/dist/x86_64-osx/Cabal-2.0.1.0/setup/setup ...
    setup: The program 'llvm-config' version ==5.0.* is required but the version
    found at /usr/local/opt/llvm/bin/llvm-config is version 9.0.1