Дарт: Почему собственные расширения не скомпилированы для Windows?

Среда Windows: Windows 7 x64 с Dart 2.1.0-dev.2.0, Visual Studio 2008.

Когда я пытаюсь скомпилировать файл DLL из пример, ошибки происходят. Я использую инструкция и попытаться выполнить все условия.

Как это исправить? Как скомпилировать dll файлы?

Видео: https://drive.google.com/file/d/1FjSIo-2U4F1JlYjvFQGxCu-jIcvGS4Xw/view

Git: https://github.com/StekolschikovV/sample_extension/tree/master/sample_extension

Ошибки:

Warning 1   warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    795 sample_extension
Error   2   error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h   795 sample_extension
Warning 3   warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    803 sample_extension
Error   4   error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h   803 sample_extension
Warning 5   warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    814 sample_extension
Error   6   error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h   814 sample_extension
Warning 7   warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1021    sample_extension
Error   8   error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h   1021 sample_extension
Warning 9   warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1043    sample_extension
Error   10  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 1043  sample_extension
Warning 11  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1092    sample_extension
Error   12  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 1092  sample_extension
Warning 13  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1253    sample_extension
Error   14  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 1253  sample_extension
Warning 15  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1263    sample_extension
Error   16  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 1263  sample_extension
Warning 17  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    1304    sample_extension
Error   18  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 1304  sample_extension
Warning 19  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2296    sample_extension
Error   20  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2296  sample_extension
Warning 21  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2310    sample_extension
Error   22  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2310  sample_extension
Warning 23  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2351    sample_extension
Error   24  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2351  sample_extension
Warning 25  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2367    sample_extension
Error   26  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2367  sample_extension
Warning 27  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2392    sample_extension
Error   28  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2392  sample_extension
Warning 29  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2418    sample_extension
Error   30  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2418  sample_extension
Warning 31  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2441    sample_extension
Error   32  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2441  sample_extension
Warning 33  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    2967    sample_extension
Error   34  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 2967  sample_extension
Warning 35  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3001    sample_extension
Error   36  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3001  sample_extension
Warning 37  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3112    sample_extension
Error   38  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3112  sample_extension
Warning 39  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3129    sample_extension
Error   40  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3129  sample_extension
Warning 41  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3144    sample_extension
Error   42  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3144  sample_extension
Warning 43  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3185    sample_extension
Error   44  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3185  sample_extension
Warning 45  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3200    sample_extension
Error   46  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3200  sample_extension
Warning 47  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3218    sample_extension
Error   48  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3218  sample_extension
Warning 49  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3351    sample_extension
Error   50  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3351  sample_extension
Warning 51  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3362    sample_extension
Error   52  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3362  sample_extension
Warning 53  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3410    sample_extension
Error   54  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3410  sample_extension
Warning 55  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3418    sample_extension
Error   56  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3418  sample_extension
Warning 57  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3428    sample_extension
Error   58  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3428  sample_extension
Warning 59  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3447    sample_extension
Error   60  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3447  sample_extension
Warning 61  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3471    sample_extension
Error   62  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3471  sample_extension
Warning 63  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3480    sample_extension
Error   64  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3480  sample_extension
Warning 65  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_api.h    3500    sample_extension
Error   66  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_api.h 3500  sample_extension
Warning 67  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_native_api.h 170 sample_extension
Error   68  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_native_api.h    170 sample_extension
Warning 69  warning C4091: '__declspec(dllexport)' : ignored on left of 'int' when no variable is declared c:\program files\dart\dart-sdk\include\dart_native_api.h 176 sample_extension
Error   70  error C2143: syntax error : missing ';' before '['  c:\program files\dart\dart-sdk\include\dart_native_api.h    176 sample_extension