Ryan Scott authored
These modules were previously provided by the `transformers` package. Hence the submodule update. This patch was originally contributed by M Farkas-Dyck and subsequently taken over and completed by Ryan. The original proposal discussion can be found at https://mail.haskell.org/pipermail/libraries/2015-July/026014.html This addresses #11135 Differential Revision: https://phabricator.haskell.org/D1543e0e03d5b
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