Function sourceview5_sys::gtk_source_completion_provider_populate_finish

pub unsafe extern "C" fn gtk_source_completion_provider_populate_finish(
    self_: *mut GtkSourceCompletionProvider, 
    result: *mut GAsyncResult, 
    error: *mut *mut GError
) -> *mut GListModel

This is supported on crate feature v5_0 only.