Build fails

[Ben Gamari]

Simon Peyton Jones <simonpj at microsoft.com> writes:

> Also lots of tests give
>
> ghc-stage2: panic! (the 'impossible' happened)
>
>   (GHC version 8.1.20160523 for x86_64-unknown-linux):
>
>        Binary.readBinMem: decompression failed
>
> CallStack (from HasCallStack):
>
>   error, called at compiler/utils/Binary.hs:192:16 in ghc:Binary
>
> Should I revert some hi-file compression patch?

I currently have a local build running to confirm the issue. That being
said, Harbormaster doesn't seem to be seeing this particular issue
(although it fails for other reasons).

I wonder if you have some some old interface files hanging around. Does this
help,

    git clean -fxd
    git submodule foreach git clean -fxd

If that helps it would be nice if you could take note of which interface
files it removes so we can update the build system to clean them.

Cheers,

- Ben

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