Simon Jakobi authored Apr 07, 2020 and Andreas Klebinger committed Sep 01, 2020

Previously I would get an error during `make boot`:

    EffBench.hs:10:18: error:
        Could not load module ‘Control.Monad.State.Strict’
        It is a member of the hidden package ‘mtl-2.2.2’.
        You can run ‘:set -package mtl’ to expose it.
        (Note: this unloads all the modules in the current scope.)
        Use -v (or `:set -v` in ghci) to see a list of the files searched for.
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    10 | import qualified Control.Monad.State.Strict as S
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