syntax_data: {"ast_node_type":"variable","tokens":[{"end":47,"kind":"keyword","start":0,"text":"let"}]}
source_snippet:     let mut deduplicate = FxHashSet::default();
context_before:     let mut tys = extract_component_raw(tcx, typing_env, ty, &mut Default::default());
context_after:     tys.retain(|oty| deduplicate.insert(*oty));