Simon Peyton Jones
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