[Haskell-cafe] How to debug HSC to HS conversion failure?

I’m getting the following error in response to `cabal build`: running {pros_dir}/dist-newstyle/build/x86_64-osx/ghc-8.8.4/haskarchpriv-0.1.0.0/build/HaskArch/TLM2_hsc_make failed (exit code -11) rsp file was: “{proj_dir}/dist-newstyle/build/x86_64-osx/ghc-8.8.4/haskarchpriv-0.1.0.0/build/HaskArch/hsc2hscall86171-3.rsp" My project contains one *.hsc file, which is the target of the error above. How can I debug the cause of this? The “rsp” file is nowhere to be found; what is(was) it? And, is it a helpful debugging aid? If so, is there an option I can give, to preserve it? Thanks! -db