syntax_data: {"ast_node_type":"other","tokens":[{"end":52,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:                 if this.seen_tys.insert(component) {
context_before:             let queue_type = move |this: &mut Self, component: Ty<'tcx>| {
context_after:                     this.unchecked_tys.push((component, level + 1));