pub unsafe extern "C" fn Dart_RegisterIsolateServiceRequestCallback(
method: *const c_char,
callback: Dart_ServiceRequestCallback,
user_data: *mut c_void
)
pub unsafe extern "C" fn Dart_RegisterIsolateServiceRequestCallback(
method: *const c_char,
callback: Dart_ServiceRequestCallback,
user_data: *mut c_void
)