• Herbert Valerio Riedel's avatar
    base: Add new Control.Monad.Fail module (re #10751) · 8c80dcc1
    Herbert Valerio Riedel authored
    This is based on David's initial patch augmented by more extensive
    Haddock comments.
    This has been broken out of D1248 to reduce its size
    by splitting the patch into smaller logical pieces.
    On its own, this new module does nothing interesting yet.
    Later patches will add support for a different desugaring of
    `do`-blocks, at which point the new `MonadFail` class will
    become more useful.
    Reviewed By: ekmett, austin
    Differential Revision: https://phabricator.haskell.org/D1424
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