SERVER-40527 Fix missing virtual in agg_expression_test

2 files changed, 9 insertions, 0 deletions

diff --git a/src/mongo/db/pipeline/expression_test.cpp b/src/mongo/db/pipeline/expression_test.cpp
index 62695188828..5028d870e24 100644
--- a/src/mongo/db/pipeline/expression_test.cpp
+++ b/src/mongo/db/pipeline/expression_test.cpp
@@ -222,6 +222,10 @@ public:
         return _isCommutative;
     }
 
+    void acceptVisitor(ExpressionVisitor* visitor) final {
+        return visitor->visit(this);
+    }
+
     static intrusive_ptr<Testable> create(bool associative, bool commutative) {
         return new Testable(associative, commutative);
     }
diff --git a/src/mongo/db/pipeline/expression_visitor.h b/src/mongo/db/pipeline/expression_visitor.h
index e049c127c3c..7141547ad54 100644
--- a/src/mongo/db/pipeline/expression_visitor.h
+++ b/src/mongo/db/pipeline/expression_visitor.h
@@ -31,6 +31,10 @@
 
 #include "mongo/platform/basic.h"
 
+namespace ExpressionTests {
+class Testable;
+}  // namespace ExpressionTests
+
 namespace mongo {
 
 class ExpressionConstant;
@@ -268,6 +272,7 @@ public:
     virtual void visit(ExpressionFromAccumulator<AccumulatorStdDevSamp>*) = 0;
     virtual void visit(ExpressionFromAccumulator<AccumulatorSum>*) = 0;
     virtual void visit(ExpressionFromAccumulator<AccumulatorMergeObjects>*) = 0;
+    virtual void visit(ExpressionTests::Testable*) = 0;
 };
 
 }  // namespace mongo