{"ast_node_type":"function","tokens":[{"end":88,"kind":"keyword","start":0,"text":"pub(crate)"}]}
    pub(crate) fn graph(&self, num_region_vars: usize) -> graph::NormalConstraintGraph {
    /// after the graph is built will not be present in the graph.
        graph::ConstraintGraph::new(graph::Normal, self, num_region_vars)