github/gitignore — pull request #1223 by mlacorte (2014-09-22 06:04:05+00:00)
Title: Ignore HPC files generated by GHC

"GHC creates a subdirectory .hpc in the current directory, and puts HPC index (.mix) files in there..."

https://www.haskell.org/ghc/docs/7.4.2/html/users_guide/hpc.html