syntax_data: {"ast_node_type":"variable","tokens":[{"end":52,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut sg = specialization_graph::Graph::new();
context_before: ) -> Result<&'_ specialization_graph::Graph, ErrorGuaranteed> {
context_after:     let overlap_mode = specialization_graph::OverlapMode::get(tcx, trait_id);