{"msg":{"caption":"trace output","file_name":"f","pos_col":22,"pos_line":5,"severity":"information","text":"hello\n"},"response":"additional_message"}
{"msg":{"caption":"trace output","file_name":"f","pos_col":23,"pos_line":6,"severity":"information","text":"test\n"},"response":"additional_message"}
{"message":"file invalidated","response":"ok","seq_num":0}