c_g_simple_async_result_new_error

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)
GSimpleAsyncResult* function(GObject* sourceObject, GAsyncReadyCallback callback, void* userData, GQuark domain, gint code, char* format, ...) c_g_simple_async_result_new_error;

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