1 files changed, 8 insertions, 0 deletions
diff --git a/src/mbgl/style/expression/boolean_operator.cpp b/src/mbgl/style/expression/boolean_operator.cpp
index 88797f965a..8d277450ba 100644
--- a/src/mbgl/style/expression/boolean_operator.cpp
+++ b/src/mbgl/style/expression/boolean_operator.cpp
@@ -26,6 +26,10 @@ bool Any::operator==(const Expression& e) const {
     return false;
 }
 
+std::vector<optional<Value>> Any::possibleOutputs() const {
+    return {{ true }, { false }};
+}
+
 
 EvaluationResult All::evaluate(const EvaluationContext& params) const {
     for (auto it = inputs.begin(); it != inputs.end(); it++) {
@@ -49,6 +53,10 @@ bool All::operator==(const Expression& e) const {
     return false;
 }
 
+std::vector<optional<Value>> All::possibleOutputs() const {
+    return {{ true }, { false }};
+}
+
 using namespace mbgl::style::conversion;
 
 template <class T>