Bug#903619: haskell-language-python FTBFS build hangs.

[peter green]

Package: haskell-language-python
Version: 0.5.4-6

 From the amd64 build log.

[16 of 23] Compiling Language.Python.Version2.Parser.Parser ( dist-ghc/build/Language/Python/Version2/Parser/Parser.hs, dist-ghc/build/Language/Python/Version2/Parser/Parser.o )
E: Build killed with signal TERM after 150 minutes of inactivity

Things look similar on other architectures.