Benchmarking the cost of (some of) transformers

These benchmarks can easily be ran with Nix. Assuming you have Nix installed, you can build the benchmarks executable with:

nix-build

Benchmarks can than be ran with

./result -o report.html

If you don't have Nix, you'll have to manually install transformer-ocharles with Cabal. You may get different results as you'll be in a slightly different environment.