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Herbert Valerio Riedel authored
This allows to reach the GhciState without having to keep track how many Monad transformer layers sit on top of the GHCi monad. While at it, this also refactors code to make more use of the existing `modifyGHCiState` operation. This is a preparatory refactoring for #10874 Differential Revision: https://phabricator.haskell.org/D1582
2f6e87a4