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Define binary subtraction syntax.

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This commit is contained in:
Rob Rix 2017-05-03 11:26:53 -04:00
parent b4face5176
commit b8bd18e742
1 changed files with 7 additions and 0 deletions
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src/Data/Syntax/Expression.hs
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@ -27,3 +27,10 @@ data Plus a = Plus a a
instance Eq1 Plus where liftEq = genericLiftEq
instance Show1 Plus where liftShowsPrec = genericLiftShowsPrec
-- | Binary subtraction.
data Minus a = Minus a a
deriving (Eq, Foldable, Functor, Generic1, Show, Traversable)
instance Eq1 Minus where liftEq = genericLiftEq
instance Show1 Minus where liftShowsPrec = genericLiftShowsPrec