    {-# LANGUAGE CPP #-}
    {-# LANGUAGE FlexibleContexts #-}
    {-# LANGUAGE MultiParamTypeClasses #-}

    #if __GLASGOW_HASKELL__ >= 710
    {-# LANGUAGE PatternSynonyms #-}
    {-# LANGUAGE ViewPatterns #-}
    #endif
    -----------------------------------------------------------------------------
    -- |
    -- Module      :  Data.Dynamic.Lens
    -- Copyright   :  (C) 2012-2016 Edward Kmett
    -- License     :  BSD-style (see the file LICENSE)
    -- Maintainer  :  Edward Kmett <ekmett@gmail.com>
    -- Stability   :  experimental
    -- Portability :  non-portable
    --
    ----------------------------------------------------------------------------
    module Data.Dynamic.Lens
      ( AsDynamic(..)
    #if __GLASGOW_HASKELL__ >= 710
      , pattern Data.Dynamic.Lens.Dynamic
    #endif
      ) where

    import Control.Exception
    import Control.Exception.Lens
    import Control.Lens
    import Data.Dynamic

    -- | Any 'Dynamic' can be thrown as an 'Exception'
    class AsDynamic t where
      -- | This 'Prism' allows you to traverse the typed value contained in a
      -- 'Dynamic' where the type required by your function matches that
      -- of the contents of the 'Dynamic', or construct a 'Dynamic' value
      -- out of whole cloth. It can also be used to catch or throw a 'Dynamic'
      -- value as 'SomeException'.
      --
      -- @
      -- '_Dynamic' :: 'Typeable' a => 'Prism'' 'Dynamic'       a
      -- '_Dynamic' :: 'Typeable' a => 'Prism'' 'SomeException' a
      -- @
      _Dynamic :: Typeable a => Prism' t a

    instance AsDynamic Dynamic where
      _Dynamic :: Prism' Dynamic a
    _Dynamic = (a -> Dynamic) -> (Dynamic -> Maybe a) -> Prism' Dynamic a
    forall b s a. (b -> s) -> (s -> Maybe a) -> Prism s s a b
    prism' a -> Dynamic
    forall a. Typeable a => a -> Dynamic
    toDyn Dynamic -> Maybe a
    forall a. Typeable a => Dynamic -> Maybe a
    fromDynamic
      {-# INLINE _Dynamic #-}

    instance AsDynamic SomeException where
      _Dynamic :: Prism' SomeException a
    _Dynamic = p Dynamic (f Dynamic) -> p SomeException (f SomeException)
    forall a. Exception a => Prism' SomeException a
    exception(p Dynamic (f Dynamic) -> p SomeException (f SomeException))
    -> (p a (f a) -> p Dynamic (f Dynamic))
    -> p a (f a)
    -> p SomeException (f SomeException)
    forall b c a. (b -> c) -> (a -> b) -> a -> c
    .(a -> Dynamic) -> (Dynamic -> Maybe a) -> Prism Dynamic Dynamic a a
    forall b s a. (b -> s) -> (s -> Maybe a) -> Prism s s a b
    prism' a -> Dynamic
    forall a. Typeable a => a -> Dynamic
    toDyn Dynamic -> Maybe a
    forall a. Typeable a => Dynamic -> Maybe a
    fromDynamic
      {-# INLINE _Dynamic #-}

    #if __GLASGOW_HASKELL__ >= 710
    pattern $bDynamic :: a -> s
    $mDynamic :: forall r s a.
    (AsDynamic s, Typeable a) =>
    s -> (a -> r) -> (Void# -> r) -> r
    Dynamic a <- (preview _Dynamic -> Just a) where
      Dynamic a :: a
    a = AReview s a -> a -> s
    forall b (m :: * -> *) t. MonadReader b m => AReview t b -> m t
    review AReview s a
    forall t a. (AsDynamic t, Typeable a) => Prism' t a
    _Dynamic a
    a
    #endif