diff --git a/src/Data/Syntax/Expression.hs b/src/Data/Syntax/Expression.hs
index d0ac70c3b..887c9eedb 100644
--- a/src/Data/Syntax/Expression.hs
+++ b/src/Data/Syntax/Expression.hs
@@ -22,14 +22,83 @@ instance Evaluatable Call where
     op <- subtermValue callFunction
     Rval <$> call op (map subtermAddress callParams)
 
-data Comparison a
-  = LessThan !a !a
-  | LessThanEqual !a !a
-  | GreaterThan !a !a
-  | GreaterThanEqual !a !a
-  | Equal !a !a
-  | StrictEqual !a !a
-  | Comparison !a !a
+data LessThan a = LessThan { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 LessThan where liftEq = genericLiftEq
+instance Ord1 LessThan where liftCompare = genericLiftCompare
+instance Show1 LessThan where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable LessThan where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      (LessThan a b)         -> liftComparison (Concrete (<)) a b
+
+data LessThanEqual a = LessThanEqual { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 LessThanEqual where liftEq = genericLiftEq
+instance Ord1 LessThanEqual where liftCompare = genericLiftCompare
+instance Show1 LessThanEqual where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable LessThanEqual where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      (LessThanEqual a b)         -> liftComparison (Concrete (<=)) a b
+
+data GreaterThan a = GreaterThan { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 GreaterThan where liftEq = genericLiftEq
+instance Ord1 GreaterThan where liftCompare = genericLiftCompare
+instance Show1 GreaterThan where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable GreaterThan where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      (GreaterThan a b)         -> liftComparison (Concrete (>)) a b
+
+data GreaterThanEqual a = GreaterThanEqual { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 GreaterThanEqual where liftEq = genericLiftEq
+instance Ord1 GreaterThanEqual where liftCompare = genericLiftCompare
+instance Show1 GreaterThanEqual where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable GreaterThanEqual where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      (GreaterThanEqual a b)         -> liftComparison (Concrete (>=)) a b
+
+data Equal a = Equal { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 Equal where liftEq = genericLiftEq
+instance Ord1 Equal where liftCompare = genericLiftCompare
+instance Show1 Equal where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable Equal where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      -- TODO: in PHP and JavaScript, the equals operator performs type coercion.
+      -- We need some mechanism to customize this behavior per-language.
+      (Equal a b)         -> liftComparison (Concrete (==)) a b
+
+data StrictEqual a = StrictEqual { lhs :: a, rhs :: a }
+  deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
+
+instance Eq1 StrictEqual where liftEq = genericLiftEq
+instance Ord1 StrictEqual where liftCompare = genericLiftCompare
+instance Show1 StrictEqual where liftShowsPrec = genericLiftShowsPrec
+
+instance Evaluatable StrictEqual where
+  eval t = rvalBox =<< (traverse subtermValue t >>= go) where
+    go x = case x of
+      -- TODO: in PHP and JavaScript, the equals operator performs type coercion.
+      -- We need some mechanism to customize this behavior per-language.
+      (StrictEqual a b)         -> liftComparison (Concrete (==)) a b
+
+data Comparison a = Comparison { lhs :: a, rhs :: a }
   deriving (Declarations1, Diffable, Eq, Foldable, FreeVariables1, Functor, Generic1, Hashable1, Mergeable, Ord, Show, ToJSONFields1, Traversable, Named1, Message1)
 
 instance Eq1 Comparison where liftEq = genericLiftEq
@@ -39,15 +108,7 @@ instance Show1 Comparison where liftShowsPrec = genericLiftShowsPrec
 instance Evaluatable Comparison where
   eval t = rvalBox =<< (traverse subtermValue t >>= go) where
     go x = case x of
-      (LessThan a b)         -> liftComparison (Concrete (<)) a b
-      (LessThanEqual a b)    -> liftComparison (Concrete (<=)) a b
-      (GreaterThan a b)      -> liftComparison (Concrete (>)) a b
-      (GreaterThanEqual a b) -> liftComparison (Concrete (>=)) a b
-      -- TODO: in PHP and JavaScript, the equals operator performs type coercion.
-      -- We need some mechanism to customize this behavior per-language.
-      (Equal a b)            -> liftComparison (Concrete (==)) a b
-      (StrictEqual a b)      -> liftComparison (Concrete (==)) a b
-      (Comparison a b)       -> liftComparison Generalized a b
+      (Comparison a b)         -> liftComparison (Concrete (==)) a b
 
 -- | Binary arithmetic operators.
 data Arithmetic a
diff --git a/src/Language/Java/Assignment.hs b/src/Language/Java/Assignment.hs
index a5959d3e3..7e3448f05 100644
--- a/src/Language/Java/Assignment.hs
+++ b/src/Language/Java/Assignment.hs
@@ -36,6 +36,12 @@ type Syntax =
    , Declaration.VariableDeclaration
    , Expression.Arithmetic
    , Expression.Call
+   , Expression.LessThan
+   , Expression.LessThanEqual
+   , Expression.GreaterThan
+   , Expression.GreaterThanEqual
+   , Expression.Equal
+   , Expression.StrictEqual
    , Expression.Comparison
    , Expression.BOr
    , Expression.BXOr
diff --git a/src/Language/PHP/Assignment.hs b/src/Language/PHP/Assignment.hs
index 945cee9b5..ecdc4ef18 100644
--- a/src/Language/PHP/Assignment.hs
+++ b/src/Language/PHP/Assignment.hs
@@ -53,6 +53,12 @@ type Syntax = '[
   , Expression.XOr
   , Expression.Call
   , Expression.Cast
+  , Expression.LessThan
+  , Expression.LessThanEqual
+  , Expression.GreaterThan
+  , Expression.GreaterThanEqual
+  , Expression.Equal
+  , Expression.StrictEqual
   , Expression.Comparison
   , Expression.InstanceOf
   , Expression.MemberAccess
diff --git a/src/Language/Python/Assignment.hs b/src/Language/Python/Assignment.hs
index fc49cd68c..4f6489642 100644
--- a/src/Language/Python/Assignment.hs
+++ b/src/Language/Python/Assignment.hs
@@ -60,6 +60,12 @@ type Syntax =
    , Expression.RShift
    , Expression.Complement
    , Expression.Call
+   , Expression.LessThan
+   , Expression.LessThanEqual
+   , Expression.GreaterThan
+   , Expression.GreaterThanEqual
+   , Expression.Equal
+   , Expression.StrictEqual
    , Expression.Comparison
    , Expression.Enumeration
    , Expression.ScopeResolution
diff --git a/src/Language/TypeScript/Assignment.hs b/src/Language/TypeScript/Assignment.hs
index 9b187929a..a7e09eb4d 100644
--- a/src/Language/TypeScript/Assignment.hs
+++ b/src/Language/TypeScript/Assignment.hs
@@ -61,6 +61,12 @@ type Syntax = '[
   , Expression.XOr
   , Expression.Call
   , Expression.Cast
+  , Expression.LessThan
+  , Expression.LessThanEqual
+  , Expression.GreaterThan
+  , Expression.GreaterThanEqual
+  , Expression.Equal
+  , Expression.StrictEqual
   , Expression.Comparison
   , Expression.Enumeration
   , Expression.MemberAccess