Windows build fails for 8.8.1

Job #145907 failed for 9c787d4d:

"inplace/bin/ghc-stage1.exe" -M -static  -O -H64m -Wall      -this-unit-id ghc-heap-8.8.1 -hide-all-packages -i -ilibraries/ghc-heap/. -ilibraries/ghc-heap/dist-install/build -Ilibraries/ghc-heap/dist-install/build -ilibraries/ghc-heap/dist-install/build/./autogen -Ilibraries/ghc-heap/dist-install/build/./autogen -Ilibraries/ghc-heap/.    -optP-include -optPlibraries/ghc-heap/dist-install/build/./autogen/cabal_macros.h -package-id base-4.13.0.0 -package-id ghc-prim-0.5.3 -package-id rts -Wall -XHaskell2010 -XNoImplicitPrelude -O2 -haddock  -no-user-package-db -rtsopts  -Wno-deprecated-flags     -Wnoncanonical-monad-instances  -outputdir libraries/ghc-heap/dist-install/build -dep-makefile libraries/ghc-heap/dist-install/build/.depend-v.haskell.tmp -dep-suffix "" -include-pkg-deps   libraries/ghc-heap/./GHC/Exts/Heap.hs  libraries/ghc-heap/./GHC/Exts/Heap/Closures.hs  libraries/ghc-heap/./GHC/Exts/Heap/ClosureTypes.hs  libraries/ghc-heap/dist-install/build/GHC/Exts/Heap/Constants.hs  libraries/ghc-heap/dist-install/build/GHC/Exts/Heap/InfoTable.hs  libraries/ghc-heap/dist-install/build/GHC/Exts/Heap/InfoTable/Types.hs  libraries/ghc-heap/dist-install/build/GHC/Exts/Heap/InfoTableProf.hs  libraries/ghc-heap/dist-install/build/GHC/Exts/Heap/Utils.hs

libraries\ghc-heap\dist-install\build\GHC\Exts\Heap\Constants.hs:1:1: error:
    File name does not match module name:
    Saw: `Main'
    Expected: `GHC.Exts.Heap.Constants'
libraries/hpc/ghc.mk:4: libraries/hpc/dist-install/build/.depend-v.haskell: No such file or directory
make[1]: *** [libraries/ghc-heap/ghc.mk:5: libraries/ghc-heap/dist-install/build/.depend-v.haskell] Error 1
make[1]: *** Waiting for unfinished jobs....