2 files changed, 8 insertions, 0 deletions
diff --git a/libsolidity/ast/Types.cpp b/libsolidity/ast/Types.cpp
index 8cc125fe..395faf55 100644
--- a/libsolidity/ast/Types.cpp
+++ b/libsolidity/ast/Types.cpp
@@ -1897,6 +1897,13 @@ bool FunctionType::operator==(Type const& _other) const
 	return true;
 }
 
+TypePointer FunctionType::unaryOperatorResult(Token::Value _operator) const
+{
+	if (_operator == Token::Value::Delete)
+		return make_shared<TupleType>();
+	return TypePointer();
+}
+
 string FunctionType::toString(bool _short) const
 {
 	string name = "function (";
diff --git a/libsolidity/ast/Types.h b/libsolidity/ast/Types.h
index 691ddf29..9831bc42 100644
--- a/libsolidity/ast/Types.h
+++ b/libsolidity/ast/Types.h
@@ -892,6 +892,7 @@ public:
 	TypePointer selfType() const;
 
 	virtual bool operator==(Type const& _other) const override;
+	virtual TypePointer unaryOperatorResult(Token::Value _operator) const override;
 	virtual std::string toString(bool _short) const override;
 	virtual unsigned calldataEncodedSize(bool _padded) const override;
 	virtual bool canBeStored() const override { return m_location == Location::Internal || m_location == Location::External; }