1 files changed, 2 insertions, 5 deletions
diff --git a/include/mbgl/style/expression/in.hpp b/include/mbgl/style/expression/in.hpp
index ab8e2e9ff2..6bd57e2833 100644
--- a/include/mbgl/style/expression/in.hpp
+++ b/include/mbgl/style/expression/in.hpp
@@ -8,7 +8,7 @@ namespace mbgl {
 namespace style {
 namespace expression {
 
-class In : public Expression {
+class In final : public Expression {
 public:
     In(std::unique_ptr<Expression> needle_, std::unique_ptr<Expression> haystack_)
         : Expression(Kind::In, type::Boolean), needle(std::move(needle_)), haystack(std::move(haystack_)) {}
@@ -26,16 +26,13 @@ public:
         return false;
     }
 
-    std::vector<optional<Value>> possibleOutputs() const override { return {nullopt}; }
+    std::vector<optional<Value>> possibleOutputs() const override { return {{true}, {false}}; }
 
     std::string getOperator() const override { return "in"; }
 
 private:
     std::unique_ptr<Expression> needle;
     std::unique_ptr<Expression> haystack;
-    static bool isComparableType(type::Type type);
-    static bool isComparableRuntimeValue(type::Type type);
-    static bool isSearchableRuntimeValue(type::Type type);
 };
 
 } // namespace expression