rules_haskell
                                
                                
                                
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                        Replace custom "set" library by Skylib's sets.bzl
rules_haskell contains a home-grown set library in haskell/private/set.bzl. However, it's implementation is very similar to the one provided by Skylib. We should switch to the Skylib provided one and remove the homegrown version.
Skylib's version doesn't expose mutable_{union,difference}, so I've opened https://github.com/bazelbuild/bazel-skylib/pull/415 for that.