Mark functions static

libsolidity/codegen/ExpressionCompiler.cpp

@@ -1819,7 +1819,7 @@ void ExpressionCompiler::setLValueToStorageItem(Expression const& _expression)
 	setLValue<StorageItem>(_expression, *_expression.annotation().type);
 }
 
-bool ExpressionCompiler::cleanupNeededForOp(Type::Category _type, Token::Value _op) const
+bool ExpressionCompiler::cleanupNeededForOp(Type::Category _type, Token::Value _op)
 {
 	if (Token::isCompareOp(_op) || Token::isShiftOp(_op))
 		return true;