Closely related to the session module is the package management functionality (which is derived from scripths). Since we are using the system GHCi process we can control what packages are visible to it by giving it custom package environments. When a package is installed we run cabal install --lib –package-env= then restart the GHCi session. This is the recommended way (at time of writing) of making GHCi play well with packages.
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The optimization treadmill