GHC HEAD build error

[Jan Stolarek]

> Can anyone else reproduce the following build error?
Yes. I recently had this error on one of my machines when compiling with perf-llvm. I didn't have 
time to debug it, but I thought that my GHC installation is at fault (which might actually be the 
case). However, during last two days I have done many successful builds on another machine. Which 
GHC version are you using?

Janek