floatExpr tick break<2>
When running the Shake test suite against GHC HEAD I get:
ghc: panic! (the 'impossible' happened) (GHC version 7.11.20150615 for x86_64-unknown-linux): floatExpr tick break<2>()
Full log at https://travis-ci.org/ndmitchell/shake/jobs/67636563. The command line that produced it is:
runhaskell -ignore-package=hashmap -ioutput/docs/ -isrc output/docs/Main.hs
If this seems like a legitimate bug that you don't already know about and are interested in tracking down, I'll try and grab the output/docs directory (it's on a remote machine I don't have access to on a different OS with a compiler I don't have installed, so it's not trivial to find it, but should be possible).