c_g_file_copy_async

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
__gshared extern (C)
void function(GFile* source, GFile* destination, GFileCopyFlags flags, int ioPriority, GCancellable* cancellable, GFileProgressCallback progressCallback, void* progressCallbackData, GAsyncReadyCallback callback, void* userData) c_g_file_copy_async;

Meta