GHC 8.0.2 fails to build on macOS 10.13/Xcode 9 - preprocessor error in ghc-pkg

Building GHC 8.0.2 on macOS 10.13 fails with the following error when building

utils/ghc-pkg/Main.hs:1269:40: error:
     error: editor placeholder in source file
               then termText (location db) <#> termText "\n    (no packages)\n"
                                           ^

I'm not very familiar with Haskell, but it looks to me like the C preprocessor is mistaking <#> for an invalid cpp directive instead of Haskell syntax.

This is using the Xcode 9 beta (and its associated CLT), which ships "Apple LLVM version 9.0.0 (clang-900.0.22.8)". The same version should be available in the Xcode 9 beta for 10.12, but I haven't tested.

The full build logs are available here: https://gist.github.com/anonymous/dc5f0c9d087f5d299f71393805c5d611

Trac metadata

Trac field	Value
Version	8.0.2
Type	Bug
TypeOfFailure	OtherFailure
Priority	normal
Resolution	Unresolved
Component	ghc-pkg
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