servant/servant-client-core/include/overlapping-compat.h

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#if __GLASGOW_HASKELL__ >= 710
#define OVERLAPPABLE_ {-# OVERLAPPABLE #-}
#define OVERLAPPING_ {-# OVERLAPPING #-}
#else
{-# LANGUAGE OverlappingInstances #-}
#define OVERLAPPABLE_
#define OVERLAPPING_
#endif