I use fzf when I'm on the command-line. To configure GHCi to use fzf instead of haskeline's built-in search:
Here I'd like to show an example of runtime complexity, arising from a practical problem.
A question in compiler design is: what optimizations should a given compiler perform? Optimizations for functional languages in particular are not well-known; it is not obvious which optimizations will provide the greatest speedup on user code.
cpkg is now live on Hackage. It is a good deal less polished than I'd originally wanted, but it already gives impressive results (among them cross-compiling XMonad).next