Return diagnostic msg

The expected return msg:

[#{message =>
                                                                            <<"Unused macro: BASIC">>,
                                                                        range =>
                                                                            #{'end' =>
                                                                                  #{character =>
                                                                                        13,
                                                                                    line =>
                                                                                        1},
                                                                              start =>
                                                                                  #{character =>
                                                                                        8,
                                                                                    line =>
                                                                                        1}},
                                                                        severity =>
                                                                            2,
                                                                        source =>
                                                                            <<"UnusedMacros">>},
                                                                      #{message =>
                                                                            <<"Unused macro: UNOO">>,
                                                                        range =>
                                                                            #{'end' =>
                                                                                  #{character =>
                                                                                        12,
                                                                                    line =>
                                                                                        2},
                                                                              start =>
                                                                                  #{character =>
                                                                                        8,
                                                                                    line =>
                                                                                        2}},
                                                                        severity =>
                                                                            2,
                                                                        source =>
                                                                            <<"UnusedMacros">>}]